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Modes and Configurations

V.34bis Series Standalone & Rackmount Modems

When an originating modem receives the appropriate carrier signal and

then determines it is not a LAPM link, it then sends an MNP frame which

Error Correction and Data Compression

The AJ Modems support V.42 error correction LAPM protocol plus V.42bis
data compression, and the Microcom Networking Protocol (MNP) Class 4
error correction plus MNP Class 5 data compression. These protocols are
designed to be as transparent to the user as possible. These operations
are discussed in the paragraphs that follow.

LAPM/MNP Error Correction Operation

LAPM/MNP provides error free communications and a boost in throughput.

LAPM/MNP works by dividing data to be transmitted into segments, or

frames. Each frame is transmitted with additional information so that the

receiving modem can determine if an error occurred in the frame. If there is

an error, the receiving modem requests the transmitting modem to re-

transmit the frame. A frame will be re-translated until it is received

correctly, or the two modems decide that the telephone line is too degraded

to allow acceptable transmission, and then hang up.

LAPM/MNP has its own flow control and break handling methods built into

the protocol. This means that a LAPM/MNP communications link is always

divided into three virtual links: a non-error corrected link between the DTE

and modem, the LAPM/MNP error corrected link between the modems, and

another non-error corrected link between the remote modem and remote

device.

When the AT*Tn command is set for LAPM operation with n=2, or if LAPM

is automatically operative when n=3, an error free connection will be

established with an enhanced throughput. Errors in the data transmission

will be detected and corrected with generally no noticeable effect to the

operator. The LAPM operation begins with a detection phase of a time

period determined by the setting of the S87 register (default time setting is

1.5 seconds).

During the detection phase the originating modem transmits a special

character pattern and the answering modem responds with another special

pattern. If the originating modem detects the response pattern within the

detect time a LAPM connection is established. If the special pattern for

LAPM is not detected the originating modem proceeds to a MNP

connection if MNP is enabled. If the answering modem does not receive

the special LAPM pattern from the originating modem within the detect time

it will wait for a MNP frame for 3 seconds if MNP is enabled. Note: If the

S87 register time is set to "0" the detection phase is bypassed and the

modems proceed directly to a LAPM connection and the fallback to MNP

will be disabled.

Содержание V.34bis series

Страница 1: ...pied reproduced translated or reduced to any electronic medium or machine readable form without prior written consent of CXR Telcom Corporation Information in this publication is subject to change without notice CXR Telcom assumes no responsibility for errors or omissions in this publication or for the use of this material 96 51000 280 Rev E 2001 CXR Telcom Corporation All rights reserved I S O CE...

Страница 2: ...ts contact F ation CXR Telcom Corpor 47233 Fremont Boulevard remont CA 945338 6502 F 510 657 8810 510 657 1158 E Mail marketing cxr com The V 34bis Series Standalone Rackmount Modems are products of CXR elcom Corporation T Printed in the USA ...

Страница 3: ...ion Requirements 8 Telephone Line Access 9 System Start Up 9 External Dial Up Modems 11 Rackmount Modem Card 14 Switch Settings 16 Power On Test 17 3 MODES AND CONFIGURATIONS 19 Common Operations 19 Selecting a Factory Configuration 21 Selecting a Configuration By AT Command 22 Special Reset 22 Factory Default Configurations 26 Originate A Call 38 Answer A Call 38 Disconnecting 39 Busy Out 40 Pass...

Страница 4: ...4 Manual Dial Back Up 80 Change Real Time and Date 80 6 AT AND V 25BIS COMMAND SETS 81 AT Commands by Function 81 7 S REGISTERS 115 S Register Functions 115 8 MAINTENANCE AND TESTING 125 Modem Testing 126 Guide To Testing 126 AT Test Commands 127 APPENDIX A 133 Product line Warranty 133 APPENDIX B 135 FCC Canadian Regulation Info 135 APPENDIX C 138 Specifications 138 RS 232 Pin Assignments 142 APP...

Страница 5: ...ll as appendices and an index The appendices serve as a quick reference for detailed information provided in the chapters A listing of the chapters with a brief description of their contents follows 1 Introduction This chapter provides information on manual organization as well as an introduction and a detailed description of the AJ modem 2 Installation Connection Installation and connection leads...

Страница 6: ...the AT commands by function as well as alphabetical order are provided V 25bis commands are provided at the end of this chapter 7 S Registers This chapter discusses S registers used to store configuration parameters 8 Maintenance and Testing This chapter covers testing and diagnostic steps used to help isolate communication problems Appendix A Product Line Warranty Appendix B FCC and Canadian Regu...

Страница 7: ...curity codes Remote configuration monitoring and control and extensive security modes are also provided Standard Features V 34 Compatible 33 6K bps full duplex operation V 34 Compatible 28 8K bps full duplex operation V 32terbo Compatible 19 2K bps full duplex operation V 32bis Compatible 14 4K bps full duplex operation V 32 Compatible 9600 bps full duplex operation with trellis coding V 23 V 22bi...

Страница 8: ...ialer Features Asynchronous AT expanded command set for dialing Alternate ITU T V 25bis dialer Pulse tone and adaptive dialing Second dial tone detection Single command redial operation Dialing from the PC keyboard Automatic redial when the connection provides poor signal quality or loss of carrier is detected Storage of 100 telephone numbers of a maximum of 25 digits each Each stored telephone nu...

Страница 9: ... Local digital loopback per ITU T V 54 Local Analog Loopback Remote Digital Loopback Power Supplies External Models Only The power supply module for the external model is supplied with the modem It provides regulated 5 VDC through a single cable that plugs into the rear of the modem The standard module is plugged into a dedicated wall receptacle or high quality power strip that must provide a nomi...

Страница 10: ...Introduction 6 V 34bis Series Standalone Rackmount Modems ...

Страница 11: ...list to verify you have received all your equipment In case of a shortage in any of the items for your particular DSU please contact your local distributor or CXR AJ Customer Service at 800 537 5762 Package Contents Your modem comes in a protective carton along with a number of other items The contents of the box will depend upon whether you have purchased an internal or external AJ modem model Ex...

Страница 12: ...l port A RJ 45 telephone line jack and leased line connections terminated in a JM 8 jack An RS 232 shielded cable with a 25 pin D type connector for the modem to DTE connection A telephone set required only for manual dial back up operation Items Needed to Install a Rackmount Modem Power Cord Standalone chassis only Two telephone cables one with RJ 11 plug at both ends for dial line connections an...

Страница 13: ...sis are located in cabinets with other equipment that would block the convection cooling it is necessary to provide a minimum of one and one half inches of unobstructed space at the top and bottom so that airflow is not restricted When the heat generated by the equipment in the cabinet cannot be ventilated by convection cooling then forced airflow is required This may be done by the addition of a ...

Страница 14: ...the status AT Sn command see Chapter 3 If the n position is omitted then the full twelve pages are presented but the continuation of the status display can be aborted by typing any character except enter If n the desired page of the status display then only that page is presented After connecting the modem to the DTE and to the telephone line or lines the user should look over the option settings ...

Страница 15: ...232 cable from the serial port to the modem connector marked TERMINAL Read your PC owner s manual to locate the serial port 5 Turn the modem power switch OFF Connect the power supply cable into the connection marked POWER on the modem Plug the power supply into a standard three prong AC wall outlet 6 Turn the modem power switch ON The modem will perform a self test If the modem passes the self tes...

Страница 16: ...ackmount Modems Figure 2 2 External Modem Switches and Jumpers Modem Wall Jack Simple With Telephone Modem Wall Jack With Telephone Answering Machine Modem Wall Jack Answering Machine Figure 2 3 Connecting the Wiring for a Dial Up External Modem ...

Страница 17: ...em has three modular jacks labeled LEASE LINE and TEL LINE Determine which jacks are utilized for the required application based upon the following LEASE LINE Used for 2 4 Wire lease line applications or as the telephone set connection for dial data applications This allows for manual dialing or voice When using the Automatic Dial Back Up feature the telephone line jack is required to access the d...

Страница 18: ... card slot modem RJ 11 45 SIGNAL L L 1 LEASED LINE TRANSMITTER L L 2 LEASED LINE TRANSMITTER GROUND L L 7 LEASED LINE RECEIVER GROUND L L 8 LEASED LINE RECEIVER D1 4 DIAL 1 PHONE TIP D1 5 DIAL 1 PHONE RING D2 3 DIAL 2 MODE INDICATOR D2 4 DIAL 2 LINE RING D2 5 DIAL 2 LINE TIP D2 6 DIAL 2 MODE INDICATOR COMMON Table 2 1 Connections to RJ 11 45 Connectors to Telco 8 7 6 5 4 3 2 1 PIN POSITIONS 1 2 3 ...

Страница 19: ...llation V 34bis Series Standalone Rackmount Modems 15 Figure 2 5 Rackmount Switches and Jumpers Standard Rackmount Assembly Shown in Factory Default Position Note Short J10 to disable the AT command function ...

Страница 20: ...ARE OFF Alternate Signals Switch Settings for EIA Interface For Signal Quality output to pin 21 Set S1 1 S1 4 OFF then set S1 2 ON For Signal Quality output to pin 11 Set S1 2 S1 3 OFF then set S1 4 ON For RDL command input from pin 21 Set S1 2 S1 3 OFF then set S1 1 ON For RDL command input from pin 11 Set S1 1 S1 4 OFF then set S1 3 ON For Speed command input from pin 23 Set S1 6 OFF then set S1...

Страница 21: ...the modem by sliding the rear panel power switch to the ON position If the modem passes the power up self test three short beeps will be heard Failure is indicated by four lower pitched tones and the LEDs will indicate the type of failure After the self test the DTR LED begins to flash if DTE is not connected or turns on if the DTE is connected and provides an on signal Rackmount Modems With power...

Страница 22: ...Installation 18 V 34bis Series Standalone Rackmount Modems ...

Страница 23: ...ly one AT prefix is required at the beginning of the line Each command consists of the following elements The two character sequence AT A command A command parameter optional A carriage return Example To enter the command Answer type ATA and enter If the subscript n 0 is desired it is not necessary to type the 0 If the n position is left blank the modem assumes a 0 Table 6 2 provides the full deta...

Страница 24: ...ortion of the AT command set the following paragraphs discuss how to perform the most common day to day modem functions utilizing the AT commands After a command is entered the modem sends a message or result code to the terminal screen Most commands are acknowledged by OK The modem can be arranged to send the result code in words or as digits with the Word Digit ATVn command The most common resul...

Страница 25: ...INATE MODE W UADBU AT F3 4 WIRE LEASED LINE ANSWER MODE W UADBU AT F4 Dial Up Factory Configurations 0 through 4 DIAL UP AT F0 DIAL UP DSR CD CTS FORCED ON AT F1 DIAL UP DSR CD CTS FORCED ON AT F2 V 25bis HDLC SDLC AT F3 V 25bis BISYNC AT F4 As shipped from the factory Factory Configuration 0 is also stored as the User Configuration 0 Factory Configuration 1 is also stored as User Configuration 1 ...

Страница 26: ...wered up A factory configuration can be used without deleting the user configuration as long as the factory configuration is not saved as the user configuration with the AT Wn command Special Reset Command AT W255 This is a special command that resets the modem to the factory settings including the erasing of all telephone numbers and attributes stored and the erasing of all passwords that may hav...

Страница 27: ... the central office will disconnect the call within two minutes When originating an international call S Register 7 should be set to 120 seconds ATS7 120 to allow for the possible extended time for a call to be connected This assures there will be enough time for the call to be connected and for the modems to train Some software packages have a limit for the modem connect time e g Crosstalk defaul...

Страница 28: ... positive value of 1 255 minutes asynchronous mode only Abort Timer If no carrier tone is detected within the time period specified in S Register 7 the modem will drop the line The default time period is 60 seconds Loss of Carrier If the modem loses carrier it will disconnect from the telephone line after the period of time specified by S Register 10 The default is 2 0 seconds In Table 3 1 on the ...

Страница 29: ... EIA RDL CTRL OFF ER0 EIA SPEED CTRL OFF ES0 EIA LAL CTRL OFF EA0 EIA DISC TIME 1 S41 1 SYNC DTR DELAY 0 S25 0 Type enter to continue FACTORY CONFIGURATION 0 PAGE 2 DIALING AND ANSWERING ONLINE DIALER TYPE ASYNC AT V1 TRELLIS ON T1 ADAPT DIAL OFF A0 XMIT EQUALIZER OFF X0 DIAL METHOD TONE T LOSS CD TIME 20 S10 20 DTMF PULSE WID 70 S11 70 CD DETECT TIME 6 S9 6 PULSE RATIO 39 61 P0 LOSS CD REDIAL OFF...

Страница 30: ...LVL 6 dBm XL5 MODEM SPEED 33600 M17 AUTO DIAL BKUP OFF U0 DATA BITS 8 B8 FALL DWN LIMIT 0 40 PARITY NONE P0 DIAL BKUP ALRM ON V1 STOP BITS 1 S1 WEEKDAY WINDOW OUTSIDE WD0 ASYNC SYNC ASYNC M0 START HOUR 0 S72 0 SYNC CLOCK INTERNA L X0 STOP HOUR 0 S73 0 START HOUR 0 S74 0 WEEKEND WINDOW OUTSIDE WE0 STOP HOUR 0 S75 0 WNDW END DISC OFF Y0 LEASE LOOKBACK OFF L0 LOOKBACK TIMER 0 S56 0 Type enter to cont...

Страница 31: ...C XON Q S64 17 CLR RBF XMIT OFF KC0 RESP LOC XOFF S S65 19 CLR RBF RECV OFF KD0 FILTER XMIT FC OFF XF0 XMIT BRK TIME 0 S46 0 GEN REM FC NONE RG0 RECV BRK TIME 0 S47 0 GEN REM XON Q S62 17 GEN REM XOFF S S63 19 RESP REM FC NONE RR0 RESP REM XON Q S69 17 RESP REM XOFF S S70 19 FILTER RECV FC OFF RF0 Type enter to continue ...

Страница 32: ...REAM STREAM B0 MAX PACK SIZE 256 P3 ADAPT PACKET ON A1 CORRECTED CHAR S50 36 LINK ABORT CHR 128 S52 128 DATA COMPRESS OFF E1 BREAK TYPE NORMAL KT0 ATTN BRK TIME 3 S48 3 Type enter to continue FACTORY CONFIGURATION 0 PAGE 6 SECURITY INFORMATION ANSWERBACK A ssssssssssss ssssssssssss PASSWORDS SUPERVISOR PS ssssssssssss ssssssssssss OPERATOR PO ssssssssssss ssssssssssss SECURITY OPTIONS AT COMMANDS ...

Страница 33: ...rd number link cnf attr SET CLOCK Thh mm ss mm dd yy LOAD DEFAULTS ON RESET L0 USER 0 BUSY OUT OFF H0 RINGS TO BUSY 0 S20 0 IDENTIFICATION In HANG UP H GO ONLINE O LOAD FACTORY DEFAULTS Fn LOAD USER CONFIGURATION Mn STORE USER CONFIGURATION Wn RESET STATISTICS RS RESET MODEM Z Type enter to continue FACTORY CONFIGURATION 0 PAGE 8 CONNECT STATUS OFF LINE CONNECT TIME 17 41 19 LAST DIAL 555 1234 Typ...

Страница 34: ...OR CORRECTION STATUS TRANSMIT RECEIVE 63678 SECONDS 12 0 CHARACTERS 12 0 BYTES 12 0 DATA FRAMES 0 0 RNR FRAMES 13249 13261 RR FRAMES 0 0 REJ FRAMES 0 0 ATTN FRAMES 0 0 ATTN ACK FRAMES 128 DATA BYTES CURRENT MAXIMUM PER FRAME 128 DATA BYTES ABSOLUTE MAXIMUM PER FRAME ERROR CORRECTION OFF Type enter to continue FACTORY CONFIGURATION 0 PAGE 10 TEST COMMANDS LOCAL ANALOG LOOP T1 LAL WITH SELF TEST T8 ...

Страница 35: ...y Default Configurations Continued FACTORY CONFIGURATION 0 PAGE 12 DIAL LINE STATISTICS DIAL LINE ACTIVE 0 SECONDS DIAL LINE IDLE 63743 SECONDS TOTAL 63743 SECONDS ORIGINATE CONNECTS 0 ANSWER CONNECTS 0 ORIGINATE FAILURES 0 ANSWER FAILURES 0 DIAL LINE RETURNS 0 DIAL RETURN TIME 0 SECONDS Table 3 1 Factory Default Configurations Continued Factory Configuration Setting 1 Default Factory Configuratio...

Страница 36: ...A COMPRESS OFF E0 Table 3 1 Factory Default Configurations Continued Default Factory Configuration Setting 2 4 W LEASED LINE ANSWER MODE AT F2 Same as AT F0 except 1 COMMAND ECHO OFF E0 2 QUIET ON Q1 3 CONNECT MSG AT XMIT OK C1 4 DTR FORCED D0 5 DSR FORCED D0 6 CARRIER OFF XMIT C2 7 CTS FORCED C0 8 ANY CHAR ABORT OFF B0 9 AUTO BAUD OFF A0 10 DTE SPEED 9600 D4 11 DATA BITS 7 B7 12 PARITY EVEN P4 13...

Страница 37: ... ON Q1 3 CONNECT MSG AT XMIT OK C1 4 DTR FORCED D0 5 DSR FORCED D0 6 CARRIER OFF XMIT C2 7 CTS FORCED C0 8 ANY CHAR ABORT OFF B0 9 AUTO BAUD OFF A0 10 DTE SPEED 9600 D4 11 DATA BITS 7 B7 12 PARITY EVEN P4 13 LEASED LINE 4 WIRE L2 14 AUTO DIAL BKUP ON U1 15 DIAL BKUP ALRM OFF V0 16 LEASE LOOKBACK ON L1 17 LOOKBACK TIMER 1 S56 1 18 DTE BUFF SIZE 256 B0 19 GEN LOC FC NONE LG0 20 CORRECTED MODE EXCLUS...

Страница 38: ...N Q1 3 CONNECT MSG AT XMIT OK C1 4 DTR FORCED D0 5 DSR FORCED D0 6 CARRIER OFF XMIT C2 7 CTS FORCED C0 8 BAD SQ REDIAL SQ 7 Q2 9 ANY CHAR ABORT OFF B0 10 AUTO BAUD OFF A0 11 DTE SPEED 9600 D4 12 DATA BITS 7 B7 13 PARITY EVEN P4 14 LEASED LINE 4 WIRE L2 15 LEASED LN MODE ANSWER O0 16 AUTO DIAL BKUP ON U1 17 LEASE LOOKBACK ON L1 18 DTE BUFF SIZE 256 B0 19 GEN LOC FC NONE LG0 20 CORRECTED MODE EXCLUS...

Страница 39: ... as AT F0 except 1 DTR FORCED D0 2 DSR FORCED D0 3 CARRIER FORCED C0 Factory Configuration Setting 3 V 25bis HDLC SDLC DIALER AT F3 Same as AT F0 except 1 COMMAND ECHO OFF E0 2 CARRIER DTR CARR C3 3 DIALER TYPE V25 HDLC V3 4 AUTO BAUD OFF A0 5 ASYNC SYNC SYNC M1 6 GEN LOC FC NONE LG0 7 CORRECTED MODE OFF M1 Factory Configuration Setting 4 V 25bis BISYNC DIALER AT F4 Same as AT F0 except 1 COMMAND ...

Страница 40: ...Modes and Configurations 36 V 34bis Series Standalone Rackmount Modems ...

Страница 41: ...using an RS 232 cable with pins 2 3 7 and 20 as the minimum connection If the terminal or PC does not have a pin 20 DTR output this signal can be forced on in the modem with the AT D0 W CR command CR Carriage Return or ENTER Some terminals or PCs require one or more of pins 5 6 and 8 to operate In that case those pins will require connection and or be forced on by the modem See the AT commands in ...

Страница 42: ...he telephone line is not of good quality the modem may redial or the modem may operate at a lower speed and send a CONNECT message to the terminal or PC If the terminal does not auto baud or the modem is not set for constant terminal speed it will be necessary to change the terminal speed To Answer A Call Connect the equipment as above TYPE ATS0 1 W CR Modem responds OK The modem is now set to ans...

Страница 43: ...ion to DTR AT D2 is selected turn off DTR from the DTE or turn off the DTE The modem will sense the On to Off transition of DTR and will disconnect from the line The modem will automatically disconnect if the remote modem disconnects If a positive value is stored in S Register 32 the modem will automatically disconnect from the line if no data is transmitted received or both depending on the AT In...

Страница 44: ...1 The modem power up self test failed 2 No 5v power supplied to the modem 3 The modem rings 5 times without going off hook this might occur if no DTR signal is present 4 The modem answered 5 consecutive incoming calls without successfully connecting with the remote modem This might occur if the DSP is defective or the phone line is connected to the wrong jack Note 1 Jumpers J 12 and J 13 must be p...

Страница 45: ...3333 D The index of the stored phone number This number can range from 0 to 99 NAME A 12 character ASCII string which is used for dialing and answer security PASSWORD A 12 character ASCII string which is used for answer security PHONE NUMBER A 25 character phone number including hyphens parentheses and dial modifiers LINK The index of the next stored number in a chain If an attempted call fails th...

Страница 46: ...are left blank to indicate that they are not used The ATTR will default to D Example AT Z7 SUE T3O68 555 4321 C stores the number 555 4321 at stored location 7 with the name SUE password T3O68 The LINK and CNF values are blank to indicate they are not used ATTR is set to C An asterisk can be used when changing a value in an existing phone number record Example AT Z4 N will change the ATTR to N whi...

Страница 47: ...t something easily guessed The most frequently used combination for the safes on the Manhattan Project was 238 If TEST or JOE were used for passwords the most unsophisticated attempts would breach the security Using a password such as B45M9J3 would require a nearly impossible effort to achieve access Please do not forget the passwords There is no easy way to access the modem for that circumstance ...

Страница 48: ...without the password and the modem will prompt for the password before executing the command For example ATDT555 1111 Enter password The user now enters the correct password and the modem will then dial the number The modem will not echo the characters as the password is entered The supervisor password can be entered in place of the operator password to allow complete access to all commands The pa...

Страница 49: ...security is enabled the modem will prompt callers for a password If the caller enters the correct password the modem will allow access to the DTE If the password entry is incorrect the modem will simply disconnect from the line Answer back The answerback security feature function is like the pass through access function except the operator does not type the password The answering modem upon connec...

Страница 50: ... call back security involves storing the appropriate telephone number and password in memory with the C attribute and enabling call back security with the AT SA1 command The answering modem will have a random delay before dialing back the calling modem To set up call back security 1 Store the call back number at the answering modem where the password field is the password and the number is the num...

Страница 51: ...s an A attribute or a D attribute if dialing is by AT commands from an asynchronous terminal keyboard in the calling modem and the N attribute in the answering modem 2 Enable the pass through access security in the answering modem with the AT SA1 command 3 For additional security the answer back security and or a second password transmission may be implemented as in call back security For this ope...

Страница 52: ...Modes and Configurations 48 V 34bis Series Standalone Rackmount Modems AT Z0 Tom XXZYY N store Tom ...

Страница 53: ...he modem should allow a second and third attempt If a correct password is entered then the modem should call back the user AT SA1 enable answer security AT SP1 prompts turned on AT ST1 allow 3 attempts AT SL0 case sensitivity disabled AT Z0 Joe XXYZZ 555 1111 C store Joe AT Z0 Tom XXZYY 555 2222 C store Tom 4 Call Back The modem should wait for password only without prompting The password will con...

Страница 54: ...4 0S75 0 Set window for the weekend AT WE1 Originate is disabled during the weekend AT O1 Set to originate AT L3 Unattended Automatic Dial Back Up AT D0 Force DTR on Restricted Auto Answer Leased Line This feature is used when the customer needs the modem to not answer after a specified time or to disconnect at a specified time For example suppose you want the modem to answer between 8 am and 5 p ...

Страница 55: ...When this time interval expires the modem is disabled and will not auto answer a call until it is reset To reset this timer press the DL DIS switch twice turn power off and then on or issue the ATZ general reset command The setting of S91 Redial Auto Answer Disable Timer provides an allowed time interval for a redial to occur The time interval begins when a call is auto answered If the modem is un...

Страница 56: ...ce a data call to the remote modem After the security password exchange ENTER CONTROL Z three times in the same manner as The modem will request the supervisor password ENTER Supervisor Password The modem will reply OK The operator at the local site now has control of the remote modem and may proceed to issue AT commands to the remote modem ENTER AT commands followed by a carriage return in the us...

Страница 57: ...col This means that a LAPM MNP communications link is always divided into three virtual links a non error corrected link between the DTE and modem the LAPM MNP error corrected link between the modems and another non error corrected link between the remote modem and remote device When the AT Tn command is set for LAPM operation with n 2 or if LAPM is automatically operative when n 3 an error free c...

Страница 58: ...computer system to ignore the initial modem data containing the MNP frame Once a MNP link is formed it is maintained until it is explicitly stopped with a command the phone line becomes too noisy or degraded or the modem goes on hook The LAPM MNP feature is enabled by the following procedure 1 Enable a DTE flow control option The flow control function instructs a DTE to stop transmitting if the mo...

Страница 59: ...ion These operations are entirely transparent to the user The AT En Command for Data Compression AT En Where n is either 0 or 1 AT E0 Data compression is disabled AT E1 Default Modem will operate with V 42bis data compression if a LAPM link is established or will operate with MNP Class 5 data compression if a MNP link is established The AT En command enables or disables data compression when a LAP...

Страница 60: ... 256 DATA BYTES CURRENT MAXIMUM PER FRAME 256 DATA BYTES ABSOLUTE MAXIMUM PER FRAME LAPM WINDOW SIZE 15 TRANSMIT 15 RECEIVE OK or for V 42bis data compression with a LAPM connection V 42 BIS BOTH DIRECTIONS DICTIONARY SIZE 1024 STRING LENGTH 32 OK The two columns are for transmit and receive statistics respectively The line labeled Seconds shows the number of seconds since the communications link ...

Страница 61: ... Data Frames LAPM The line labeled Data Frames shows the number of LAPM data frames sent and received RNR Frames LAPM The line labeled RNR Frames shows the number of Receive Not Ready frames sent and received The modem sends a RNR frame when it is not ready to receive data frames RR Frames LAPM The line labeled RR Frames shows the number of Receive Ready frames sent and received The modem sends a ...

Страница 62: ...dems have agreed they can both buffer internally in the transmit and the receive directions The last line with a V 42bis data compression link indicates the V 42bis connection plus the directions that compression is operative the dictionary size and the string length Error Correction Data Compression Status MNP Example TRANSMIT RECEIVE 31135 53113 SECONDS 21250216 21250478 CHARACTERS 15362453 2125...

Страница 63: ...received In the example the transmit compression ratio is 21250216 uncompressed characters divided by 15362453 compressed characters or 1 38 This means every data byte sent by the modem represented 1 38 bytes of user s data Data Frames The line labeled Data Frames shows the number of MNP data frames sent and received Dup Data Frames The line labeled Dup Data Frames shows the number of MNP data fra...

Страница 64: ...modems have agreed they can both buffer internally MNP supports three classes of modem connection Class 1 A rarely seen asynchronous half duplex modem link not supported Class 2 An asynchronous full duplex modem link Class 3 A synchronous full duplex link MNP Class 4 may be a misleading name because it is simply a set of optimizations which can be applied to any of the classes 1 through 3 The opti...

Страница 65: ...Modes and Configurations V 34bis Series Standalone Rackmount Modems 61 ...

Страница 66: ...nually originate If the hes twice the modem will manually leased line pressing the switch will activate leased P P itch when online disconnects the modem from the line Configuration Select Holding DL DIS for more than 4 seconds will initiate a hardware reset If the switch is still pressed after the beeps the modem will enter configuration mode The front panel LEDs indicate which configuration Comm...

Страница 67: ...Leased Line Operation V 34bis Series Standalone Rackmount Modems 63 the user can select as given on Table 4 2 alternate AT commands are also shown ...

Страница 68: ...n 1 2 OFF M2 ON ON OFF User configuration 2 3 ON OFF OFF OFF User configuration 3 M3 4 OFF ON OFF User configuration 4 M4 ON 5 OFF OFF F0 ON ON Dial configuration 6 OFF ON OFF S forced o F1 ON Dial up DSR CD CT n 7 OFF ON ON Dial up DSR CD CTS forced on F2 ON 8 ON OFF OFF V 25bis HDLC SDLC F3 ON 9 ON OFF ON V 25bis Bisy F4 ON nc Table 4 1 Configuration Modes Each of the configuratio ay on for 2 se...

Страница 69: ...iginate mode in leased line Also indicates a er up test defective RAM during pow CD Carrier Detect Lights when the carrier signal is detected on the line or when forced on from the modem Also indicates a defective non volatile memory during power up test TD response to data transmitted by the Transmit Data Flickers in modem RD Receive Data Flickers in response to data received by the modem HS High...

Страница 70: ...for asynchronous operatio x Modem offers several other ways to dial a telephone number T F methods can also be used when controlling the modem from a synchronous terminal Dialing via front panel DL DIS switch Dialing via DTR control Manual dialing Note To abort a dialing procedure simply strike any key on the DTE keyboard or press DL DIS Dialing via Front Panel DL DIS Switch synchronous operation ...

Страница 71: ...his switch initiates the Remote Digital Pressing Loopback Test when on line Pressing this switch a second time terminates the test This test does not use the internal test generator and comparator ORIG ANS isplay When off line momentarily pressing this switch causes the modem to go off hook and operate in the originate mode and pressing the switch for more than 2 seconds causes the modem to operat...

Страница 72: ...nnec lea ne If t odem is off line and the leased sel momentarily pressing the DISC sw F When of sion will toggle the speed to to 24000 to on the ed by other s hen depressi sw the configur 4 as indic by the LEDs This cy with the current configuration setting BS Fall Back Speed Rackmount Only f line each depres from 33600 to 31200 to 28800 26400 21600 to 19200 to 16800 to 14400 etc depending telepho...

Страница 73: ... as listed below Selected Config LED Indicators ON AT Commands User Configuration 0 HI f MED f LO f and DTR M0 User Configuration 1 HI f MED f LO f and DSR M1 User Configuration 2 HI f MED f LO f and CD M2 User Configuration 3 HI f MED f LO f and CTS M3 User Configuration 4 HI f MED f LO f and SQ M4 Dial Configuration HI f LO f and DTR F0 4 W Leased Originate Line HI f LO f and DSR F1 4 W Leased L...

Страница 74: ...nal on the n the CD is forced on b odem When in the Configuration Select Mode this icates defective non volatile memory a failed power up line or whe y the m LED ind Configuration 2 Also indicates a at the end of test or a reset CTS hen t end data i e time nego have been comple he RTS signal from the DTE must be on or must the modem When in the Config Mode this ates Configuration 3 Clear to Send L...

Страница 75: ...3600 bps 1 Blink 31200 bps 2 Blinks 28800 bps 3 Blinks 26400 bps 4 Blinks 24000 bps 5 Blinks 21600 bps MED On Steady 19200 bps 1 Blink 16800 bps 2 Blinks 14400 bps 3 Blinks 12000 bps LO On Steady 9600 bps 1 Blink 7200 bps 2 Blinks 4800 bps 3 Blinks 2400 bps Table 4 4 Rackmount Front Panel LED Indicators All speed lights off indicate 300 baud During normal modem operation the LEDs should light from...

Страница 76: ...ynchronous terminal Manual dialing Note To abort a dialing procedure simply strike any key on the DTE keyboard or press DISC Dialing via Front Panel DIAL Switch Press the DIAL switch on the front panel The modem dials the first number stored in memory with the A attribute The modem w originate if the A attribute is not stored DTR Control Dialing Turn the DT memory with the A attribute The modem wi...

Страница 77: ...ection and or be forced on using the dip switches as described in Chapter 2 The RS 232 cable may be mis wired le 4 Wire to 2 Wire adapters installed refer p degradation from the adapter When the modems are connected on a leased line one modem is esignated as the origi d modem The configurations for each are slightly different The following procedure will allow the user to quickly set up the modem ...

Страница 78: ... TYPE AT D L2 O1 WZ CR Note DSR LED will flash continuously to indicate the modem is in ORIGINATE mode For the Answering Modem TYPE AT D L2 O0 WZ CR The modems will then go through a tr each other The CTS CD SQ The modems will stay connected until there is a severe degrada leased line or a power failure When t improves the modems will automatically Commands The following commands affect AT Ln n 0 ...

Страница 79: ...atic Dial Back Up These mo Automatic includ ack Up capability to BU feature T s ill automatica ils U restore the data link operates under t make u ssary dial back u In gure the ms for UADBU start with the leased line set up The follo g additio ommands are necessary F inati odem STORE A PHONE DI EPHON ORY O UMBER WITH AN A TION page 40 for AT c TYPE AT L L1 W CR F werin odem W CR The modems now set...

Страница 80: ... back up is enabled outside the window on weekdays n 1 Dial back up is enabled inside the window on weekdays ATS72 n n 0 23 Weekday window starting hour ATS73 n n 0 23 Weekday window ending hour AT WEn Dial back up is enabled outside the window on weekends n 0 n 1 Dial back up is enabled inside the window on weekends ATS74 n n 0 23 Weekend window starting hour ATS75 n n 0 23 Weekend window ending ...

Страница 81: ...ll automatically disconnect at the end of the 8S73 17 cr at end of window ial back up is enabled inside the window on weekdays Note Optional on Leased Line only w window The connection type on the leased line is V 32 ATS72 Set window from 8 a m 5 p m weekdays AT Y1 Modem will disconnect from dial line AT WD1 D AT U1 Dial back up enabled ATS74 0S75 0 Set window for weekend AT WE1 Dial back up is en...

Страница 82: ...dial line go back to the leased line and start training for 15 seconds If the training is not successful both modems will switch back to the dial line and re establish the connection L When leased line lookback option is enabled the lookback timer S Register 56 should be enabled ATS56 n Wait for n 0 255 minutes interval then lookback at the leased line for 10 seconds n 0 is constant lookback When ...

Страница 83: ...n be invoked for the dial back up operations The first is to have the modem make the dial back up call and maintain the dial connection for five minutes before attempting the lookback action The second is to have the modem test the dial back up link once every twenty four hours These features are controlled by the S77 and S78 registers as follows S77 0 Disables these features S77 25 Enables the fi...

Страница 84: ... of the command is Thh mm yy ption is available for the Leased Line e for the Dial Up models ck up bility provides full control over the operation of the modem on dial up To initiate manual dial back up operation proceed with the initiation of number stored with an A attribute and connect see Section 4 for detailed front panel operation A beeper sound will be heard indicating the modem is in a dia...

Страница 85: ...Memory Bank T Store Time and Date Ln Load Default Options Data Format and Rate Mn Async Sync Mode Select An Auto Baud Rate Detect Bn Data Bits Cn Constant DTE Rate Dn DTE Speed Mn Modem Speed Pn DTE Parity Sn DTE Stop Bits Dialing and Answering A Answer D Dial Command DSn Dial Stored Telephone Number Hn Hook Switch Control Ln Speaker Volume Mn Speaker Control On Return to the Online State P Pulse ...

Страница 86: ...ontrol of RDL Remote Digita ESn EIA Speed Control RPn RTS Polarity Sn DSR and CD Control During Call Back Error Correc pression tion and Data Com Switch to LAPM MNP Link S9 Status Display Example An Adaptive Packet Size Bn Block Stream Mode En Enable or Disable Compression Gn LAPM MNP Error Alarm Mn Operating Modes O Originate LAPM MNP Link Pn Maximum Packet Size RS Reset Error Statistics Tn Selec...

Страница 87: ... RKn Pass Receive Break RRn Respond to Remote Flow Control XFn Filter Transmit Flow Control XKn Pass Transmit Break B3 DTE Buffer Size Leased Line and Dial Back Up Ln Leased Line or Dial Up Select Ln Leased Line Lookback On Leased Line Originate or Answer Un Auto Dial Back Up Vn Auto Dial Back Up Alarm WDn Weekday Window WEn Weekend Window XLn ansmit Level Leased Line Tr Yn Window End Disconnect O...

Страница 88: ...ty SPn Prompt Security SSn Rack Control STn Password Attempts Allowed SWn n Volatile Write Security No Test Cn Transmit Carrier Control In Request Product Firmware Revision ROM Checksum Tn Test Mode Selection Hn On Off Hook in LAL Rn Respond to RDL Request Visual Responses En Command Echo Qn Quiet Command Enable Responses Sr Read S Register Vn Result Codes as Word or Digit Xn Extended or Basic Res...

Страница 89: ...and issued singly except A command A Answer FORMAT ATA Causes t em to go off hook immediately answer an incoming phone gnal Dial D c ta communication this er he mod tele call and wait for a carrier si Note This command can be used in conjunction with the ommand to switch from voice to da command should not be used for auto answ Bn BELL CCITT Protocol Compatibility FORMAT ATBn n 0 CCITT protocol V ...

Страница 90: ...e X Dial in auto reliable mode LAPM MNP or non PM MNP Y Dial in exclusive mode LAPM MNP only Z Dial in normal mode no LAPM MNP Name Dial by name Dia name matches the ls number stored at location name entered after the sy where the stored mbol Notes The X Y and Z commands override the current co setting but only for this connection nfiguration DSn Dial Stored Tel Number FORMAT ATDSn Note When telep...

Страница 91: ...s programmable n Requests power up self test r 7 esults n 8 Requests power up configuration Ln Speaker Volume FORMAT ATLn n 0 Low volume n 1 Low volume n 2 Default Medium volume n 3 High volume Mn Speaker Control FORMAT ATMn n 0 Speaker disabled n 1 Default Speaker off when carrier received n 2 Speaker always on n 3 Speaker off when carrier received or dialing On Return to the Online State FORMAT ...

Страница 92: ... result codes are displayed in originate mode but not in answer mode R Originate Call in Answer Mode FORMAT ATDnR Note The R command must be the last dial string character When the R command is used no call progress reports are sent to the DTE When the R command is issued the modem sends the answer tone even if it receives a busy signal Sr Read S Register FORMAT ATSr Sr n Set Register FORMAT ATSr ...

Страница 93: ... CODES he selection of the results code set also determines if the ials or if it listens for a dial tone before dialing Two other some of the des that will be displayed APM or MNP functions are indicated after the ation of LAPM V42BIS MNP MNP5 is related only to the odem communication link set to n 0 then only the icated If Nn is set to n speed is the modem mum is 33 600 bp t to n 1 the indicated ...

Страница 94: ... 14400 CNX 14400 15 DELAYED DLC 16 NUMBER FORBIDDEN CFI FC 17 NUMBER NOT STORED CFI NS 18 MODEM BUSY CFI CB 19 ABORT CFI AB 20 CONNECT 19200 CNX 19200 21 CONNECT 38400 CNX 38400 22 CONNECT 57600 CNX 57600 23 CONNECT 115200 CNX 115200 24 CONNECT 16800 CNX 16800 25 CONNECT 24000 CNX 24000 26 CONNECT 28800 CNX 28800 27 ERROR CNX 28 ERROR INV CU 29 ERROR INV MS 30 ERROR INV PS 31 ERROR INV PV 32 NO CA...

Страница 95: ...14400 MNP5 58 CONNECT 19200 MNP5 CNX 19200 MNP5 59 CONNECT 38400 MNP5 CNX 38400 MNP5 60 CONNECT 300 LAPM CNX 300 LAPM 61 CONNECT 7200 LAPM CNX 7200 LAPM 62 CONNECT 1200 LAPM CNX 1200 LAPM 63 CONNECT 2400 LAPM CNX 2400 LAPM 64 CONNECT 4800 LAPM CNX 4800 LAPM 65 CONNECT 9600 LAPM CNX 9600 LAPM 66 CONNECT 12000 LAPM CNX 12000 LAPM 67 CONNECT 14400 LAPM CNX 14400 LAPM 68 CONNECT 19200 LAPM NX 19200 LA...

Страница 96: ...0 MNP5 94 CONNECT 16800 LAPM CNX 16800 LAPM 95 CONNECT 24000 LAPM 24000 LAPM CNX 96 CONNECT 28800 LAPM CNX 28800 LAPM 97 CONNECT 16800 V42BIS CNX 16800 V42BIS 98 CONNECT 24000 V42BIS CNX 24000 V42BIS 99 CONNECT 28800 V42BIS CNX 28800 V42BIS 100 CONNECT 21600 MNP CNX 21600 MNP 101 CO MNP CNX 26400 MNP NNECT 26400 102 CONNECT 21600 MNP5 CNX 21600 MNP5 103 CONNECT 26400 MNP5 CNX 26400 MNP5 104 CONNEC...

Страница 97: ...nce enable function If the modem is used in answe s the answer back r mode the originate ce or it will be modem must have the answer back sequen disconnected Bn DTE Buffer Size FORMAT AT Bn n 0 256 bytes n 1 1K bytes Default Cn CD EIA Control FORMAT AT Cn Forces CD Carrier Detect signal on to the connected DTE n 0 CD signal forced on n 1 Default CD off CD turns on if carrier is detected n 2 CD off...

Страница 98: ...ts a 2 Wire leased line connection n 2 Selects a 4 Wire leased line connection n 3 Selects UADBU connection without leased line Note Connection can be established with synchronous or asynchronous operation Mn Async Sync Mode Select FORMAT AT Mn n 0 Default Selects async operation when on line n 1 Selects sync operation for data mode ext only N Display Phone Number List FORMAT AT N Pn Pulse Dial Ma...

Страница 99: ...DT ection Sn Status D splay i FORMAT AT Sn n 0 Display each page of configuration n 1 to n 10 n 1 and inte Visual display rface signal configurations n 2 e Dialing answ ring and online configurations n 3 Format data rate and leased line configurations n 4 Flow control and break handling n 5 LAPM MNP error correction and action commands n 6 Security information n 7 Action commands n 8 Connect statu...

Страница 100: ...for LAPM operation 19972 20000 DATA ACK FRAMES RR FRAMES for LAPM operation 1 0 ERRORS REJ FRAMES for LAPM operation 0 0 ATTN FRAMES 0 0 ATTN ACK FRAMES 256 DATA BYTES CURRENT MAXIMUM PER FRAME 256 DAT IMUM PER FRAME A BYTES ABSOLUTE MAX CLASS 5 WINDOW SIZE 8 OK Or for a LAPM error correction connection the last line is LAPM WINDOW SIZE 15 TRANSMIT 15 RECEIVE Or for a V 42 bis compression connecti...

Страница 101: ...errors and issues audi n 8 Initiate LAL ALB with self test n 9 Initiate LAPM RDL with self test n 10 Test flash memory Register S18 is a test timer which can be used in conjunctio test mode command to cause the modem n with any active to exit from test mode after the the test is manually number of seconds 1 255 specified in the register If the register is set to 0 the test timer will not expire an...

Страница 102: ...follows RTS in command mode n 3 Default CTS follows DTR in command mode Dn DSR EIA Control FORMAT AT Dn n 0 DSR forced on always n 1 DSR off when modem is idle n 2 Default DSR off when modem is idle n 3 DSR off when modem is idle carrier detected n 5 DSR off when modem is idle DSR turns on when modem can pass full duplex data EAn EIA Control of LAL Local Analog Lookback FORMAT AT EAn n 0 Default D...

Страница 103: ...Disabled n 1 Enabled Mn Load Non volatile Memory Bank FORMAT AT Mn n 0 4 User configuration number On Leased Line Originate or Answer Leased Line only FORMAT AT On n 0 Leased line answer mode n 1 Default Leased line originate mode Note The S0 register applies only to operation on the dial network PO sss s sss s Store Operator Password The PO command stores an operator password in non volatile memo...

Страница 104: ...SBn Second Password Prompt in Call Back FORMAT AT SBn n 0 Default Second prompt for password in call back security disabled n 1 Second prompt for password in call back security enabled SCn AT Command Security FORMAT AT SCn n 0 Default Disabled n 1 Enabled SDn Remote Configuration Security FORMAT AT SDn n 0 Default Disabled n 1 Enabled SLn Password Upper Lower Case Sensitivity FORMAT AT SLn n 0 Def...

Страница 105: ...fault 1 attempt for correct password entry n 1 3 attempts for correct password entry SWn Non volatile Write Security FORMAT AT SWn n 0 Default Disabled n 1 Enabled The commands that write to non volatile memory are A store answerback Wn write configuration to non volatile Z store phone number PO store operator password PS store supervisor password SAn answer password security SBn second password p...

Страница 106: ...nd Window Leased line only FORMAT AT WEn n 0 Default Dial Back Up is enabled outside the window on weekends n 1 Dial Back Up is enabled inside the window on weekends Optional on leased line models XDn Dial Line Transmit Level FORMAT AT XDn n 5 8 The value of n is the transmit level in 2 dBm steps 8 indicates a transmit level of 16 dBm XLn Leased Line Transmit Level Leased line only FORMAT AT XLn n...

Страница 107: ... Break FORMAT AT Dn n 0 Default Disabled n 1 Enable En Enable or Disable Compression FORMAT AT En n 0 Disabled n 1 Default Enabled V 42bis compression for a LAPM link or MNP Class 5 compression for a MNP link Gn LAPM MNP Error Alarm FORMAT AT Gn n 0 Default Disables the LAPM MNP error alarm n 1 Enables the LAPM MNP error alarm Hn Busy Out FORMAT AT Hn n 0 Disabled Default n 1 Enabled S register 20...

Страница 108: ...eak FORMAT AT KCn n 0 Default Disabled n 1 Enabled KDn Clear Receive Buffer at Receive Break FORMAT AT KDn n 0 Default Disabled n 1 Enabled KTn Break Type FORMAT AT KTn n 0 Default Normal n 1 Destructive LBn Local Overflow Bell FORMAT AT LBn n 0 Default Disabled n 1 Enabled LGn Generate Local Flow Control FORMAT AT LGn n 0 No flow control n 1 XON XOFF n 2 Default CTS EIA signal LRn Respond to Loca...

Страница 109: ...e reports the DTE speed O Originate LAPM MNP Link FORMAT AT O Pn Maximum Packet Size FORMAT AT Pn n 0 32 bytes n 1 64 bytes n 2 128 bytes n 3 Default 256 bytes RBn Remote Overflow Bell FORMAT AT RBn n 0 Default Disabled n 1 Enabled RFn Filter Receive Flow Control FORMAT AT RFn n 0 Default Disabled XON XOFF passed through n 1 Enabled XON XOFF not passed through Note This option can be enabled only ...

Страница 110: ...otocol V 42 LAPM or MNP FORMAT AT Tn n 1 MNP only n 2 LAPM only n 3 Default LAPM MNP automatic U Accept LAPM MNP Link FORMAT AT U Vn Extended Result Codes FORMAT AT Vn n 0 Default Normal results codes n 1 Extended result codes as below Examples For LAPM error correction Connection CODE AT Dialer V 25 bis Dialer 63 CONNECT 2400 LAPM CNX 2400 LAPM 65 CONNECT 9600 LAPM CNX 9600 LAPM For LAPM with V 4...

Страница 111: ...has been issued the break is sent immediately and the transmit buffer is cleared Y Switch to LAPM MNP Link The Y command causes the modem to switch immediately to a LAPM MNP operation and attempt to establish a LAPM MNP link with the remote modem The escape code must be entered first to return to command mode This command must be given to both modems Example Current Status CONNECT 9600 Enter Escap...

Страница 112: ...Dn n 0 300 bps n 1 1200 bps n 2 2400 bps n 3 4800 bps n 4 9600 bps n 5 not used n 6 not used n 7 19200 bps n 8 38400 bps default n 9 11 Reserved for factory use n 12 57600 bps n 13 115200 bps AT A0 Auto baud off AT W Save to non volatile memory Fn Online Speed Change FORMAT AT Fn n 0 Disabled n 1 default Enabled Hn On Off Hook in LAL FORMAT AT Hn n 0 default On hook in LAL n 1 Off hook in LAL ...

Страница 113: ...s n 3 4 800 bps n 4 9 600 bps n 5 12 000 bps n 6 14 400 bps n 7 16800 bps n 8 19 200 bps n 9 7 200 bps n 10 Tx 75 Rx 1200 bps for V 23 operation n 11 Tx 1200 Rx 75 bps for V 23 operation n 12 21 600 bps n 13 24 000 bps n 14 26 400 bps n 15 28 800 bps n 16 31 200 bps n 17 33 600 bps default Note For V 23 operation issue the AT A2 command and then AT M10 or AT M11 to select the Tx Rx speeds Pn DTE P...

Страница 114: ...s Encoding FORMAT AT Tn n 0 Disables trellis encoding n 1 Default Enables trellis encoding Vn Dialer Selection FORMAT AT Vn n 0 Enables Dumb Mode n 1 Default Enables the AT asynchronous dialer n 2 Enables the V 25 bis asynchronous dialer n 3 Enables the V 25 bis HDLC synchronous dialer n 4 Enables the V 25 bis BISYNC synchronous dialer Xn Transmit Equalizer FORMAT AT Xn n 0 Default Disables the co...

Страница 115: ...mber at Location n DIC Disregard the Current Incoming Call GAT Switch to the AT Command Mode PRN n d d Stores the Number d d at Location n PRN n Clears Stored number at Location n RLN List the Stored Numbers RESPONSE FUNCTION CFI xx Call Failure Indication CNX ssss Connect Speed xxxx bps INC Incoming Call Ringing INV xx Invalid Command LSN n d d Lists Stored Number n in Response to RLN Command VAL...

Страница 116: ...ions The details of the commands and responses of the V 25 bis command set follows Note The V 25 bis EIA signaling must be configured using either AT commands or the front panel The AT commands to enable V 25 bis signaling are AT C2 AT C3 AT D2 This configuration will allow the DSR CD and CTS EIA signals to function as specified in the V 25 bis specification Table 6 4 V 25 bis Commands Responses E...

Страница 117: ...NX ssss ssss 1200 2400 4800 9600 12000 14400 16800 or 19200 INC Incoming Call FORMAT INC INV Invalid Command FORMAT INV xx xx CU Command Unknown The command received was not a valid V 25 bis command PV Parameter Value The command received contained an invalid parameter value i e illegal character in dial string or out of range number index If CU or PV is not present then the command received was i...

Страница 118: ...AT and V 25bis Command Sets 114 V 34bis Series Standalone Rackmount Modems ...

Страница 119: ...on to factory settings The values in TABLE 7 1 give the decimal value nn or the hexadecimal code when a h is indicated xxh for the S Registers When the S Registers are read by the ATSr command the response will be a decimal value If an S Register is changed by the ATSr n command the n is a decimal value On the following pages many S Registers are shown in the binary bits notation for bit mapped op...

Страница 120: ...ow start time S75 Weekend window end time S76 Weekday weekend window type and disconnect S77 Dial back up hold or test control 0 disabled S78 Dial back up test minute setting Character Definitions S2 Escape code S3 Carriage return S4 Line feed S5 Backspace S38 Downline load S50 Corrected mode S52 MNP abort S62 XON sent to remote S63 XOFF sent to remote S64 XON received from DTE S65 XOFF received f...

Страница 121: ... Result code set S34 Result codes enabled S35 Connect message DCE DTE S44 Normal Extended result codes EIA Control S21 DTR CD S28 RTS RTR DSR CD S29 CTS Connect message DSR CD during call back S51 RTR polarity EIA Status S106 EIA input S107 EIA output Flow Control and Break Handling S42 Respond to local remote S43 Generate local remote S44 Local remote bell Transmit receive filter Command mode wit...

Страница 122: ...ession enable disable S86 Error correction protocol S88 V 42bis compression control S89 V 42bis maximum string size Modem Operations S14 Leased line mode Leased Line only S21 MI MIC A A1 Long space disconnect S22 Speaker control S23 Guard tones S27 Async Sync Dial up leased line Clock source ITU T Bell modes External only S34 S Register values at disconnect S35 Automatic retrain S36 Any character ...

Страница 123: ...oduct ID S100 Product type S101 Product version number Speed Data Format S23 DTE parity and stop bits S33 DTE character length DSP word length S34 DCE follows DTE fixed AT baud rate detection S35 EIA control of speed Online speed change enabled S49 Constant DTE speed S60 DCE speed DTE speed Test Status S16 ALB DLB RDL DTMF S19 Power up S23 Respond to RDL request S35 EIA control of RDL S36 On Off h...

Страница 124: ...10 Carrier loss detect time S12 Escape guard time S18 Test timer S25 Sync delay to DTR External only S26 RTS to CTS delay S31 Wait for retrain S32 Inactivity S41 EIA drop time S46 Transmit break width S47 Receive break width S48 Attention break width S56 Leased line lookback Leased Line only S87 LAPM detection phase S90 Initial autoanswer disable timer S91 Redial autoanswer disable timer ...

Страница 125: ...d frame number in LA frame LD sent 4 LN frame sent 20 times without ack LD sent 5 LT frame sent 20 times without ack LD sent 6 LD frame sent unspecified reason 7 DISC frame sent unspecified reason 8 BRK sent 20 times without ack DISC sent 9 LAPM status inquiry sent 20 times without response 10 DM response F 0 received 11 FRMR received 12 LAPM negotiation failure code words 512 13 N R error 14 No r...

Страница 126: ...wer back failure 34 Any character abort 35 DISC frame received 56 I frame 20 times without ACK disc sent 100 Answer handshake failed to complete 101 Answer handshake failed to complete 102 DTR lost 103 Security violation bad password after Z Z Z 104 Bad answerback 105 Time out waiting for answerback 106 Time out waiting for answer password 107 Bad answer password 108 Carrier lost bad signal qualit...

Страница 127: ...which corresponds to the number of times the modem retrained during the last connected session To extract this information and prior to the establishment of the next call type ATS114 The modem will return a three digit value This value represents the actual number of times the modem retrained during the last session ...

Страница 128: ...S Registers 124 V 34bis Series Standalone Rackmount Modems ...

Страница 129: ... is included in the PC its filter and any passageways for airflow must be kept clean to allow for unrestricted airflow d HARDWARE Check that units are plugged fully into the connectors of the PCs chassis e CABLE CONNECTIONS Check all cable connections at the back of the PC chassis for proper connections and mounting with the connector screws Inspect for wear and fraying Repair if necessary Mainten...

Страница 130: ... telephone company circuit Should a problem arise the following steps must be taken to isolate the problem 1 Verify the integrity of the modem by performing the Local Analog Loopback LAL with self test at the local and remote modems 2 If the results of both tests are good perform the Remote Digital Loopback RDL with self test to verify that the modem to modem communication link is operating proper...

Страница 131: ...iate LAL ALB with self test n 9 Initiate LAPM RDL with self test Register S 18 is a test timer which can be used in conjunction with any active test mode command to cause the modem to exit from test mode after the number of seconds 0 255 specified in the register If the register is set to 0 the test timer will not expire and the modem will not exit test mode until the test is manually terminated b...

Страница 132: ... Loopback Local Remote Idle Line DTE DTE OR Front Panel LAL Button of the Local Modem Initiate Local Analog Loopback Local Remote Idle Line DTE DTE Local Analog Loopback with self test Tests the local modem transmit and receive circuits using a self generated test pattern and error checker ...

Страница 133: ...d comparator To terminate test type AT T0 The modem will return a 3 digit number indicating the number of errors Local Remote Idle Line DTE DTE Remote Digital Loopback RDL Tests the local and remote modems the local DTE local DTE interface and the associated telephone circuit AT T6 Initiate Remote Digital Loopback Local Remote Active Line DTE DTE ...

Страница 134: ...ckmount Modems OR Front Panel LAL Button of the Remote modem Local Remote Active Line Initiate Remote Digital Loopback DTE DTE OR Front Panel LAL Button of the Local modem Initiate Remote Digital Loopback Local Remote Active Line Non Error Correcton DTE DTE ...

Страница 135: ... pattern generator and comparator To terminate test type AT T0 The modem will return a 3 digit number indicating the number of errors Local Remote Active Line DTE DTE Local Digital Loopback Tests the local and remote modems the local DTE interface and the telephone unit AT T3 Local Digital Loopback Local Remote Active Line DTE DTE OR Front Panel LAL Button of the Local modem Initiate Local Digital...

Страница 136: ...dicating the number of errors AT T9 Initiate Remote Digital Loopback with LAPM Uses built in test pattern generator and comparator Local Remote Active Line DTE DTE These tests can be initiated only from the asynchronous command mode To initiate a remote or local digital loopback test a dial up or leased line connection must be established NOTE When online with a LAPM MNP connection the RDL and LDL...

Страница 137: ...rton and packing materials If the equipment is covered by warranty it will be repaired free of charge or replaced at the Company s option and returned prepaid Unauthorized field repairs or modifications will invalidate the warranty Inspection All products manufactured by CXR Telcom are carefully inspected and thoroughly tested prior to shipment Modern packaging techniques are used to prevent damag...

Страница 138: ...a quotation for repair charges first unless the shipment is accompanied by a purchase www cxr com order Repair work will be performed after authorization to proceed in the form of a purchase order is received Service Center CXR Telcom Corporation Attn Customer Service 47233 Fremont Boulevard Fremont CA 94538 6502 510 657 8810 510 657 1158 FAX ...

Страница 139: ...e by the factory Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunication company cause to request the user to disconnect the equipment Users should ensure for their own protection that the electrical ground connection of the power utility telephone lines and internal metallic water pipe system if present are connected together This pre...

Страница 140: ... provided you are given adequate written notice 4 In case of operational problems disconnect your unit by removing the modular plug form the Telco jack If your regular phone or other device or system still works properly your modem has a problem and must remained disconnected Locations and phone numbers for factory service are listed in this user s manual If upon the above disconnection your regul...

Страница 141: ...Canadian Regulation Info V 34bis Series Standalone Rackmount Modems 137 consist of any combination of devices subject only to the requirements that the total of the Load Numbers of all the devices does not exceed 100 ...

Страница 142: ...A FORMAT Serial binary synchronous asynchronous DCE DATA RATES Modem speeds 33 600 31 200 28 800 26 400 24 000 21 600 19 200 16 800 14 400 12 000 9600 4800 2400 1200 300 bps DTE INPUT RATES port speeds 115 200 57 600 38 400 19 200 9600 4800 2400 1200 300 bps OPERATING MODE Full duplex on standard dial up lines TELCO INTERFACE RJ 11 Jack for the dial up line JM8 for the leased line TRANSMIT LEVEL D...

Страница 143: ...ass 4 DATA COMPRESSION V 42bis and MNP Class 5 ENVIRONMENTAL Operating temperature 32 to 122 degrees F 0 to 50 C Storage temperature 4 to 158 degrees F 20 to 70 C Relative humidity 10 to 90 non condensing POWER REQUIREMENTS Voltage ac 117 VAC 10 15 230 VAC 10 15 50 60 Hz optionally available Frequency 57 63 Hz POWER CONSUMPTION 7 watts maximum DIMENSIONS 6 75 x 11 5 x 1 5 inches WEIGHT 6 lb includ...

Страница 144: ...4800 2400 1200 300 bps DTE INPUT RATES port speeds 115 200 57600 38400 19200 9600 4800 2400 1200 300 bps OPERATING MODE Full duplex on standard 2 Wire dial up lines or on 2 4 Wire 3002 unconditioned leased lines TRANSMIT LEVEL Dial network 10 0 dBm 1 0 dBm permissive mode Leased line 10 to 16 dBm in soft select able 2 dB steps RECEIVER CARRIER FREQ 1800 Hz 1700 Hz 2400 Hz 1200 Hz RECEIVER SENSITIV...

Страница 145: ...POWER REQUIREMENTS SMTR or UCCA 01 117 VAC 10 15 SMTR or UCCA 012 230 VAC 10 15 In standalone case UCSA 03 it will operate at either 117 VAC or 230 VAC automatically Frequency 47 63 Hz POWER CONSUMPTION 5 watts maximum per rackmount modem DIMENSIONS In UCSA XX standalone case 13 25 x 9 5 x 2 25 inches Rackmount modem assembly only 12 x 6 94 x 75 inches WEIGHT In UCSA XX standalone case 7 lbs Rackm...

Страница 146: ...Set Ready 7 SGND Signal Ground 8 DCD Data Carrier Detect 9 10v 10 10v 11 FRDL Force RDL Signal Quality 12 SPEED Speed or Dial Indication Side Channel Receive Data 13 SC Side Channel Select 14 DCTRL Force Dial Control 15 TXC Transmit Clock 16 SCTD Side Channel Transmit Data 17 RXC Receive Clock 18 FALB Force Analog Loopback 19 DLFL Dial Back Up Indicator 20 DTR Data Terminal Ready 21 SQ Signal Qual...

Страница 147: ... Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 7 SGND Signal Ground 8 DCD Data Carrier Detect 9 14 n c No Connection 15 TXC Transmit Clock 16 STD No Connection 17 RXC Receive Clock 18 n c No Connection 19 n c No Connection 20 DTR Data Terminal Ready 21 n c No Connection 22 RI Ring Indicator 23 n c No Connection 24 ETC External Transmit Clock 25 n c No Connection ...

Страница 148: ...r 54 56 112 Command Mode 59 99 Configuration Select 59 CTS 66 94 D Data Ack Frames 56 Data Compression 52 53 55 78 114 Data Frames 54 56 Dial 108 Dial Back Up 75 79 112 Dialing 68 113 Dialing and Answering 77 Dial up 60 90 DISC 63 DSR 66 94 102 DTR 62 66 68 90 DTR DSR CD FORCED AT F1 34 DTR DSR CD FORCED AT F2 34 Dup Data Frames 56 E Error Correction 50 53 55 78 114 Errors 56 F Factory Configurati...

Страница 149: ...ss of Carrier 96 M Maintenance 121 Manual Dialing 62 68 Modem Status 115 O On Line 59 ORIG ANS 63 P PASSWORD 39 42 45 95 96 97 Product ID 115 R RD 66 RDL 63 94 106 Receive Data 61 66 95 REJ Frames 54 Reset 89 Result Codes 102 RNR Frames 54 RR Frames 54 S Security 5 43 80 96 S Registers 112 T TD 66 Test Status 115 Timers 48 Transmit Data 61 66 95 U UADBU 72 71 112 V V 25 BIS BISYNC 34 V 25 bis HDLC...

Страница 150: ...Index 146 V 34bis Series Standalone Rackmount Modems ...

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Содержание V.34bis series

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