Black Box MD885A-R2 User Manual Download Page 6

Page: 6 / 150

Table of Conents

7.6

Diagnostic Monitoring: Status Screens .................................115

7.6.1

EIA Status Screen .................................................................115

7.6.2

Other Status Screens.............................................................116

7.7

Local Modem Diagnostics ......................................................118

7.7.1

Analog Loopback (ALB) Test .............................................118

7.7.2

Analog Loopback Self Test (ALBST) .................................119

7.7.3

Analog Loopback Self Test With Errors (ST/E) ...............120

7.7.4

External Analog Loopback (ALBX) Test ...........................121

7.7.5

External Analog Loopback Self Test (ALXST)...................123

7.7.6

Digital Loopback Test (DLB) .............................................124

7.8 Remote Modem Diagnostics ......................................................126

7.8.1

Remote Digital Loopback (RDL) Test ...............................126

7.8.2

Remote Digital Loopback Self Test (RDLST) ....................127

Appendix A: DB25 Pin Assignments

..........................................................129

Appendix B: Quick Setup Configurations

.............................................130

Appendix C: Summary Setup

.......................................................................135

Appendix D: Jumpers

......................................................................................144

Appendix E: LCD Flow Charts

....................................................................147

Summary of Contents for MD885A-R2

Page 1: ...00 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com AUGUST 1999 MD885A R2 MD885A R3 MD885AE R2 MD885C R2 Modem 34336 MODEM 34336 1 2 3 ENT 1 2 3 601745301 Rev A NOT...

Page 2: ...his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could v...

Page 3: ...peration 16 2 4 1 2 Wire Dial Hayes Mode 16 2 4 2 2 Wire Dial V 25 bis Mode 18 2 4 3 2 Wire Dial Dumb Mode 19 2 4 4 Leased Line 2 or 4 Wire Mode 21 2 4 5 V 33 Leased Line Operation 22 2 4 6 2 Wire Dia...

Page 4: ...o Recovery 57 4 3 3 Leased Line Auto Recovery Options 58 4 4 Dial Line Auto Recovery 58 4 4 1 Setting Up The Modem For Dial Line Auto Recovery 58 4 4 2 Recovery Procedure 58 4 5 DTR Dialing 60 4 5 1 D...

Page 5: ...Selecting Options In Hayes Mode 94 5 4 1 Saving Option Selections 94 5 4 2 Profile 0 and Profile 1 94 5 5 Hayes Mode Reference Tables 95 6 0 V 25 bis Autodialer 107 6 1 Enabling The V 25 bis Autodiale...

Page 6: ...k Self Test With Errors ST E 120 7 7 4 External Analog Loopback ALBX Test 121 7 7 5 External Analog Loopback Self Test ALXST 123 7 7 6 Digital Loopback Test DLB 124 7 8 Remote Modem Diagnostics 126 7...

Page 7: ...Serial binary Operation Full duplex over dialup or leased line Simulated half duplex V 13 operation Fallback Data Rates 16 8 14 4 12 0 9 6 7 2 4 8 2 4 1 2 or 0 3 kbps Operation V 22 bis V 22 V 21 or V...

Page 8: ...ace Terminal RS 232C D CCITT V 24 V 28 Dialup Line 8 pin RJ 45 modular connector with A A1 and MI MIC control Leased Line 6 pin RJ 11 modular connector Diagnostic 8 pin RJ 45 modular connector Carrier...

Page 9: ...modem for any reason 2 1 2 PACKAGE CONTENTS All models include the following cables A two conductor crossover cable for a dial line connection A four conductor cable for a leased line connection Both...

Page 10: ...2 Kbps a shorter low capacitance DTE interface cable should be used Call technical support for information on which cable will support your application For all applications Connect your RS 232 cable...

Page 11: ...e six pin modular connector RJ 12 to the rear panel jack labeled LEASED LINE Attach the eight pin connecter RJ 45 of the cable into the line s terminal block The same cable is used whether you have a...

Page 12: ...en the Modem is powered on the LCD momentarily displays the power on screen The top line identifies the modem type The lower line indicates the software revision level NOTE The software revision level...

Page 13: ...lternately TR Data Terminal Ready MR Data Set Ready RS Request to Send CS Clear to Send TD Transmit Data 14 4 9600 4800 etc Data speed in Kbps thousand bits per second or bps bits per second idle or H...

Page 14: ...tings see 3 0 Modem Setup Options HOW TO SELECT A QUICK SETUP To activate a Quick Setup configuration follow the steps below As you do you may find it helpful to refer to the LCD flow chart at the bac...

Page 15: ...to store and direct dial or autodial phone numbers from the DTE Use Quick Setup 2 if the DTE connected to the modem is asynchronous QUICK SETUP 03 2 WIRE DIAL V 25 bis MODE SYNCHRONOUS V25 DIAL Syn_c...

Page 16: ...s the Modem for V 33 operation This provides compatibility with V 33 modems QUICK SETUP 11 2 WIRE DIAL BELL 208 OPERATION 2 W DIAL 208 This Quick Setup configures the Modem for 2 wire dial operation c...

Page 17: ...omputer or terminal keyboard followed by the number you want to call and cr Example AT D 5551212 cr Dashes or spaces may be included for clarity but they are not necessary The Modem ignores them A car...

Page 18: ...ing data The speed may be other than 9600 bps The Modem automatically adjusts to the speed of the remote modem provided the remote unit is a compatible modem Terminating a Call To terminate a call fir...

Page 19: ...f no carrier is detected within a given time default is 45 seconds the modem automatically releases the line and sends a CFI NT result code to the attached DTE Spaces entered in the command line for c...

Page 20: ...ginate a call from the front panel you must store the number to be dialed in the modem From the Set up 5 screen access the PHONE screen by pressing the following pushbuttons in sequence Pushbutton 1 P...

Page 21: ...rmination of a data call is processed through communication software An alternate method is switching the HANGUP option on the AUTO DIAL screen Another method is to drop the DTR signal from the DTE by...

Page 22: ...orrect Leased Line Quick Setup the answer originate status is automatically set to the correct setting Leased line operation is restricted to data rates of 4800 bps or higher Lines can be conditioned...

Page 23: ...creen looks like the one shown below Three options are intended for V 33 and Bell 208A B operation exclusively These options are listed in Section 3 3 8 2 4 6 2 WIRE DIAL BELL 208 OPERATION QUICK SETU...

Page 24: ...uick Setup If the Auto Retrain option is disabled the modem will not transmit a training sequence and will instead train on the data stream from the remote modem Disabling Auto Retrain in 4 wire lease...

Page 25: ...et to answer the mode The Answer Originate option is automatically set to these settings when the V 29 Fast Master and Fast Slave Quick Setups are used Slave to Master Inbound Transmission When the re...

Page 26: ...the Hayes mode AT attention code is sent to the Modem 4 HAYES MODE In Hayes mode with default settings in effect the Modem transmits result codes messages to the DTE In some instances this may cause...

Page 27: ...26 Modem 34336 NOTE This page is intentionally left blank...

Page 28: ...od for selecting individual options You can select an overall configuration via Quick Setup and then change selected options from the front panel to suit your application To make changes access indivi...

Page 29: ...pages of a menu show additional option selections In the example below the screen number or page number is 2 2 Numbered Pushbuttons Pushbuttons 1 2 and 3 correspond to segments 1 2 and 3 of the LCD sc...

Page 30: ...nt panel When you select an option the option flashes on the LCD The option will not take effect until you leave the SETUP menu Simply accessing an option screen does not change the option so not hesi...

Page 31: ...U screen 2 then SETUP screen 4 Finally access MODEM SETUPS screen 5 The steps are explained in detail below After powering on the modem press ENT to get the first screen of the MAIN MENU Press the rig...

Page 32: ...ven if a loss of power occurs 5 How to Return to Default Settings The factory default settings are different for each of the Quick Setup configurations available to the modem To return to the factory...

Page 33: ...l to 3 volts 9600 bps Pin 23 low less than or equal to 3 volts 4800 bps Use the Speed Matching option if you don t want speed conversion You can set the DTE interface rate to follow the rate at which...

Page 34: ...imum and maximum setting EIA CTRL xx 9600 or 48002 DIAL MODES ORIGINATING 300 to 14 4001 OFF Negotiated between minimum and maximum setting EIA CTRL OFF 9600 or 48002 xx HAYES3 Negotiated between auto...

Page 35: ...Bell 208A compatibility for 2 wire or 4 wire leased line operation and Bell 208B compatibility for 2 wire dial operation Operation is full duplex in 4 wire leased line mode only In Bell 208B mode sync...

Page 36: ...ype of error correction V 42 V 42 bis or MNP The same type of error correction V 42 V 42 bis or MNP must be enabled at both ends of the communication link Both communicating modems must be configured...

Page 37: ...ror correction selected with the V42 Selection screen For example if LAPM ONLY is selected as the error correction protocol and MANDATORY is selected from the V42 Mode screen V 42 or V 42 bis error co...

Page 38: ...f a connection cannot be established using the selected protocol LAPM MNP LAPM ONLY or MNP ONLY the action the Modem takes depends on the V 42 mode setting V 42 bis Operation is available for Hayes V...

Page 39: ...sarily the same as the data transmission speed between the connected modems If flow control is disabled the DTE speed must be equal to or less than the modem speed and the local and remote DTE speeds...

Page 40: ...se use hardware flow control or as an alternative lower the DTE speed to lessen the possibility of overflow The DCE DTE Flow Control options are available for Hayes V 25 bis Dumb and Leased Line modes...

Page 41: ...the Address screen the three digits to the right of the comma are the unit address number The three digits to the left are the group address number To change the address use the right and left arrow...

Page 42: ...s available for Hayes V 25 bis and Dumb modes It determines whether or not a call is automatically answered when the phone rings Setting the Auto Answer option to ENABLE resets Hayes mode register S0...

Page 43: ...rt bit 9 data bits including parity and 1 or more stop bits In Hayes mode character length is set automatically under most conditions The Parity option is available for all modes Parity selections are...

Page 44: ...lable for Hayes V 25 bis Dumb modes When TX Space Disconnect is enabled the Modem transmits 4 seconds of space prior to disconnecting from the line This ensures a clean disconnect if RX space disconne...

Page 45: ...front panel control The Remote Test option screen for preventing or allowing remote testing looks like the one shown below 3 3 6 EIA OPTIONS The seven options described below allow control over speci...

Page 46: ...cal or remote disconnect The DTR from EIA is available for all modes It allows you to force the Data Terminal Ready DTR signal on TRUE which may be needed if your computer or communication software do...

Page 47: ...e set for 51 41 or 34 dBm The default setting is 51 dBm The Transmit Level option is available for all modes It controls the modem s transmission level To make a selection first select either LEASED o...

Page 48: ...modem s CCITT compliant trellis coder is normally enabled at speeds of 9600 bps and above but may be negotiated off by a modem that is not equipped with a trellis coder The trellis code option allows...

Page 49: ...riginate mode The Answer Tone option is available for Hayes V 25 bis and Dumb modes The answer tone frequency is selectable only if the maximum data rate is set to 1200 bps via the SPEED LIMIT menu in...

Page 50: ...s from the remote modem TX AND RX Status of RTS will be sent to remote modem and CD will be controlled by V 13 signals from the remote modem To select one of the four V 13 options press pushbutton 1 o...

Page 51: ...crease to darken characters on the LCD or pushbutton 1 for DEC or decrease to lighten them 3 3 9 OPTIONS ACCESSIBLE WITH SUMMARY SETUP ONLY The twelve options described below can only be changed throu...

Page 52: ...25 bis Dumb and Leased Line modes except V 33 This option allows the Modem to communicate with certain modems that are not able to respond to the MNP selective retransmission command Enable This sett...

Page 53: ...the modem to auto matically fall back or fall forward to a lower or higher data rate during data transmission in response to changes in signal quality Selecting V 32 bis mode makes RRP available as an...

Page 54: ...Multimode Handshake option is for Hayes V 25 bis and Dumb modes This option determines how long the Modem will attempt to handshake with a V 32 modem before falling back to a lower speed T1 Timer If...

Page 55: ...and LCD are included in Chapter 3 4 1 Quick Reset Quick Reset enables you to reset the modem without powering down the unit For a soft reset of the Modem when option settings are not changed but the...

Page 56: ...on the leased lines deteriorate the Leased Line Auto Recovery feature allows the Modem to automatically restore operation for a leased line application by using dial lines as a backup The Modem uses...

Page 57: ...Line Auto Recovery Requires prefix See DIAL LINE AUTO RECOVERY section later in this chapter W or colon Wait 30 seconds for dial tone before proceeding comma Inserts 4 second pause period Marks end o...

Page 58: ...ormal disconnects such as loss of carrier or line current may also disconnect the dial connections and return communication to the leased line To ensure the proper disconnect capabilities for Leased L...

Page 59: ...screen a loss of line current or other normal disconnect occurs Either event returns communication to the leased line NOTE The Return option setting must be the same on both communicating units If the...

Page 60: ...lect DIAL to re enable Dial Line Auto Recovery To disable Dial Line Auto Recovery select RESET from MAIN MENU screen 3 4 4 2 RECOVERY PROCEDURE If Dial Line Auto Recovery is enabled and the Modem goes...

Page 61: ...ling operations MANUAL ORIGINATE ANSWER OPERATION When the Modem is operating in Dumb mode or configured for Bell 208 operation data calls may be manually originated from a phone set Plug the phone in...

Page 62: ...nswer option is enabled After you answer the phone and initiate a conversation with the caller the Modem must be set for data mode With the MANUAL DIAL screen still displayed select DATA to put the Mo...

Page 63: ...d pass through operation Both types of security operation provide security on incoming calls by requiring remote users to enter a valid password In addition access to Hayes compatible commands for vie...

Page 64: ...nt a security command use the Hayes AT Z command to store the command in a specific memory location The password commands are listed in Table 4 2 and explained in detail in the sections that follow Ta...

Page 65: ...A phone number cannot be stored after Only one command A P or U can be stored in each memory location Do not leave a space after a command When using the U command do not include spaces or control cha...

Page 66: ...ng example programs memory location 3 for callback operation AT Z3 T5551212 PVIOLET The callback number in this example is 555 1212 with T used to specify tone dialing the password is VIOLET A remote...

Page 67: ...es of modem controlled remote control are possible Direct modem to modem control One modem can be used to control the front panel of another modem through a phone link Control through a rack controlle...

Page 68: ...ally does NOTE While a Modem 34336 is being remotely controlled by another Modem 34336 or is remotely controlling another Modem 34336 its diagnostic port cannot be used for other purposes commands fro...

Page 69: ...r Modem 34336 Control Procedure Using a Rack Controller Enabling Remote Control through a Rack Controller The main screen used to control other modems through a rack controller is REMOTE screen 2 show...

Page 70: ...u want is shown press ENT The LCD will return to REMOTE screen 2 3 Initiate control After entering the address or slot number of the modem to be controlled select CTRL from REMOTE screen 2 CTRL will f...

Page 71: ...4 1 Remote control address control mode Modems in rack equpped with rack controller Standalone modems Modems in rack with or without rack controller This modem with LCD pushbuttons can control any of...

Page 72: ...e location of the diagnostic connector next to the power connector on the modem s rear panel is shown in Figure 2 1 The diagnostic connector requires a cable with an RJ 45 modular connector on one end...

Page 73: ...ning commands listed in this table will function only if CONNECT or CON with address or has been previously issued D Displays the current front panel LCD screen of the connected modem on the DTE monit...

Page 74: ...produce a response When an address is specified with the CONNECT or CON command leading zeros are ignored meaning that any of the following forms will work CONNECT 3 22 CONNECT 003 022 CON 000003 22 I...

Page 75: ...nected with diagnostic port of modem at address g u group and unit Address may be preceded by A S or both see below A One or more modem alarms has been detected An alarm indicates a condition that may...

Page 76: ...in response to the CONNECT command characters flashing on the LCD are indicated on the DTE screen by asterisks An asterisk appears below each flashing character In the example below the selected CTS t...

Page 77: ...ATING MODE FALLBACK This section applies to dial line operation only When the Modem originates or answers a call it determines from the handshake routine with the other modem the most efficient operat...

Page 78: ...and speed are limited to the mode and speed specified Multi mode operation allows the modem to automatically fall back to the most efficient mode that can be used by both modems The preferred mode is...

Page 79: ...ate of 4800 bps The Modem selects either 14 400 bps or the fallback rate of 12 000 bps If the error rate is one error in 1000 bits or lower the Modem connects at the highest available rate If the erro...

Page 80: ...factory default Both functions are Summary Setup options The factory default setting for RRP is enabled To change the RRP option refer to the DATA PUMP OPTIONS diagram in Appemdix C Change the Rate R...

Page 81: ...nt or multidrop applications The correct options for these applications are identified in Chapter 2 The Modem normally operates in full duplex however some applications such as certain network environ...

Page 82: ...r is enabled and all modem options are automatically set to a preset configuration suitable for typical Hayes mode applications To select the 2 Wire Dial Hayes Quick Setup access QUICK SETUP screen 1...

Page 83: ...easier reading See the example below AT DT 9 212 555 1234 or AT DT 9 212 555 1234 A Command Repeats the commands included in the previous command line Because the AT is also repeated no AT is needed...

Page 84: ...carriage return or period must be used at the end of a dial string An example of a command line with two dial modifiers is shown below AT DT 9 555 1212 The modifier T instructs the modem to tone dial...

Page 85: ...atically detects and adjusts to the transmission speed set when the communication port was initialized When answering a call the Modem determines the transmission speed from the carrier signal of the...

Page 86: ...turned off and back on D Originate Mode For Dialing The modem dials the number that follows and attempts to go on line The dial command D is followed by either a telephone number to be dialed or a str...

Page 87: ...d to the first number See the command below AT D 555 1212 L5 NOTE L may also be used in V 25 bis mode with the CRN command instead of AT D in both Dumb mode and 208 operation In Dumb mode or 208 opera...

Page 88: ...er changes the value of the last register used to 5 More information on S registers is included in Section 5 3 S Read S Register This command instructs the autodialer to read the contents of the speci...

Page 89: ...n to the command state after dialing without disconnecting The following examples illustrate how the command is used The first example is a banking transaction The command AT D333 1234 dials the bank...

Page 90: ...s currently stored in the S registers The V command should be issued as the last command on a line W Write Profile To Memory The W command saves the storable parameters of the Modem s active configura...

Page 91: ...gh 9 automatically expand to the next empty cell if loaded with more than 25 digits Even if a stored number is continued to another cell the maximum number of characters that can be stored is 36 If mo...

Page 92: ...er that will be read from or written to without being specified To illustrate this if you enter the following command a pointer is set to the address of register S7 AT S7 As long as no other S command...

Page 93: ...S8 Pause Time Register S8 controls the pause time effected by a comma in a dial string or other command line S9 Carrier Detect Response Time Register S9 determines how long a carrier tone must be pres...

Page 94: ...rup or by the command AT Z or AT S18 0 S25 Delay To DTR The effect of the value stored in register S25 is dependent on the operating mode as explained below Synchronous mode 1 Before the Modem examine...

Page 95: ...et occurs unless the Modem s configuration is saved to nonvolatile memory The storable parameters of the Modem s configuration can be saved to user profile 0 or 1 using the W command W0 or W1 Upon pow...

Page 96: ...rofile 1 is recalled as the active configuration the LCD screens are not affected When profile 1 is active it is possible for the LCD to display an option setting not reflecting the setting currently...

Page 97: ...For Dialing No parameters DS Dial Stored Number Parameters are 0 9 available memory locations E Echo E0 No echo E1 Echoes all characters back to terminal screen when using a full duplex terminal and i...

Page 98: ...I4 Reserved L Link Dial L specifies LINK function when used as a dial command modifier L Speaker Volume L0 or L1 Low speaker volume L2 Medium volume L3 High volume M Speaker Control M0 Speaker always...

Page 99: ...s result codes 0 5 10 11 13 14 15 and 18 Connection speed up to 14 400 bps indicated no busy or dial tone detect X2 Selects result codes 0 6 10 11 13 14 15 and 18 Same as X1 except dial tone detect is...

Page 100: ...ers Wait For Silence Before Dialing No parameters but default wait time register S7 is 30 seconds exclamation Initiate Flash No parameters C Data Carrier Detect Control C0 DCD always ON when DTR is pr...

Page 101: ...atio is factory set depending on whether the modem is a U S or international model Q Asynchronous Synchronous Mode Q0 Asynchronous mode Q1 Synchronous mode 1 Synchronous asynchronous mode Q2 Synchrono...

Page 102: ...pback self test V View Active Configuration etc V0 Displays modem configuration user profiles and phone numbers stored in memory cells 0 5 V1 Displays all stored phone numbers contents of memory cells...

Page 103: ...DIALING message D1 Enables DIALING message F MNP Flyback Buffer 1 F0 Enables flyback buffer F1 Disables flyback buffer K V 42 Break Handling 1 K0 Selects normal break handling K1 Selects destructive...

Page 104: ...r DTE DCE 2 DC1 DC2 flow control 3 DC1 DC3 flow control default for DCE DTE and DTE DCE S View Status Of V 42 Related Configuration No parameters T Load Inactivity Timer T0 Disables inactivity timer T...

Page 105: ...r or is given an A command 3 NO CARRIER Carrier lost or never detected 4 ERROR Error in command line invalid command command line exceeds 40 characters or invalid character format 5 CONNECT 1200 Carri...

Page 106: ...bis followed by the DTE interface speed These codes indicate if the Modem is in buffer MNP or LAPM V 42 V 42 bis mode The corresponding digit codes and speeds they indicate are listed below with all...

Page 107: ...5 0 127 ASCII 8 Backspace character S6 2 255 sec 2 Wait time before blind dialing S7 1 60 sec 30 Wait time for carrier or dial tone S8 0 255 sec 2 Pause time for comma S9 1 255 1 10 sec 6 Carrier dete...

Page 108: ...matically set to a preset configuration Each V 25 bis Quick Setup is suitable for a typical V 25 bis application depending on the DTE to be used To select a 2 Wire Dial V 25 bis Quick Setup access QUI...

Page 109: ...not required If used they are ignored by the modem One exception is the colon which instructs the autodialer to wait for a dial tone The V 25 bis commands are described below and are summarized in Ta...

Page 110: ...Each cell can hold a maximum of 25 characters although cells 1 through 9 automatically expand to the next empty cell if loaded with more than 25 digits Even if a stored number is continued to another...

Page 111: ...r dial string n in memory address m RHA Switch to Hayes dialing mode also resets modem configuration RLN Request list of all stored numbers RLN m Request to see number stored at address m n represents...

Page 112: ...INK in Section 5 2 P Sets pulse dialing mode T Sets tone dialing mode W or colon Wait 30 seconds for dial tone before proceeding CR or Required at end of dial command line carriage return CR is sent f...

Page 113: ...ry Setup feature as described in Appendix C to change the parameter for V 25 bis DTR dialing to 0 Do not select DTR dialing via the front panel DIALER screen it does not enable DTR dialing for V 25 bi...

Page 114: ...identify the specific faulty component whether it is the modem the DTE or the telephone line 7 2 Symptoms and Scope of The Problem To isolate the problem carefully consider each of the following quest...

Page 115: ...iagnostics Analog loopback ALB Analog loopback self test ALBST or ST Analog loopback self test with errors ST E External analog loopback ALBX External analog loopback self test ALXST Digital loopback...

Page 116: ...5 To set the duration of a test assign a value to register S18 For example AT S18 30 sets the test time to 30 seconds The command TO terminates a test For further information see Section 5 2 7 5 3 REM...

Page 117: ...r left corner of the EIA status screen A handshake lasts for up to 12 seconds and is accompanied by various audible tones By pressing pushbutton 1 while the EIA status screen is displayed you can acce...

Page 118: ...ze Shows size of data packets MNP or blocks V 42 V 42 bis currently being transmitted MNP uses shorter packets to transmit through noisy lines and longer packets allowing greater throughput when line...

Page 119: ...m is attached to DTE or an external BERT 7 7 1 ANALOG LOOPBACK ALB TEST Analog loopback testing allows you to test the local modem and its associated terminal independently from the telephone interfac...

Page 120: ...the DTE and DTE software operations The EIA status screen is displayed while the test is being conducted Make sure that test data is being generated Watch for data errors By transmitting test data and...

Page 121: ...n off until the end of the test To end the test press the ENT pushbutton to return to the SELFTEST screen Then select OFF 7 7 3 ANALOG LOOPBACK SELF TEST WITH ERRORS ST E In the analog loopback self t...

Page 122: ...are working Errors are injected every few seconds To end the test press the ENT pushbutton to return to the SELFTEST W ERROR screen Then select OFF 7 7 4 EXTERNAL ANALOG LOOPBACK ALBX TEST The extern...

Page 123: ...ivate the test In general the DSR during ALB test option discussed in Chapter 2 should be left ON default selection to avoid disrupting the DTE and DTE software operations The EIA status screen is dis...

Page 124: ...l loopback NOTE The ALXST may result in errors or may fail altogether even where conditions are satisfactory for normal operation The test channel presented to the modem during the ALXST includes all...

Page 125: ...ies to the ALXST To end the test press the ENT pushbutton to return to the ANALOG ST EXT screen Then select OFF 7 7 6 DIGITAL LOOPBACK TEST DLB Digital loopback testing determines the operational perf...

Page 126: ...s being conducted Ensure that test data is being generated and watch for data errors By transmitting test data and comparing it with the received copy the DTE is checked for proper operation To end th...

Page 127: ...ote Test option is enabled on the remote modem This option also REMOTE TEST on the LCD is accessed via SETUP screen 4 7 8 1 REMOTE DIGITAL LOOPBACK RDL TEST The RDL test Figure 7 6 allows testing of t...

Page 128: ...T allows testing of the local modem remote modem and telephone line from the local site as did the previous test However test data is generated by internal modem circuitry as opposed to a DTE or exter...

Page 129: ...128 Modem 34336 Figure 7 7 Remote Digital Loopback Self Test PATTERN GENERATOR PATTERN DETECTOR TRANSMITTER RECEIVER TRANSMITTER RECEIVER LOCAL MODEM REMOTE MODEM...

Page 130: ...0 P Testing Voltage 10V Modem 15 DB Transmit Clock TC Modem 17 DD Receive Clock RC Modem 18 CN Analog loopback ALB control1 DTE 20 CD Data terminal ready DTR TR DTE 21 CN Remote digital loopback RDL c...

Page 131: ...2W D Speed Speed Max 19200 19200 19200 19200 19200 14400 4800 Data Rate Speed Min 300 300 300 4800 4800 12000 4800 Speed Type V 32 V 32 V 32 V 32 V 32 V 33 208 V 42 V 42 Mode Auto Auto1 Auto Auto Auto...

Page 132: ...X Space Options Disconnect Enable Enable1 Enable Enable Enable Enable Enable TX Space Disconnect Enable Enable1 Enable Enable Enable Enable Enable Carrier Disconnect Enable Enable Enable Enable Enable...

Page 133: ...mis Signal Quality Level 10 3 10 3 10 3 10 3 10 3 10 3 10 3 Compromise Equalizer T III T III T III T III T III T III T III Trellis Code Enable Enable Enable Enable Enable Enable Enable Transmit Clocki...

Page 134: ...Carrier Switched Switched4 Switched Switched Switched Constant Switched Bell 208A B options CTS RTS RTS4 RTS RTS RTS ON RTS RTS CTS Delay 0 04 0 0 0 0 150 ms Auto Auto Recovery Recovery Select None N...

Page 135: ...d mode Sync_b for bit oriented mode 2 Leased line originate and answer Quick Setups ORG and ANS on the LCD are the same except that ANSWER ORIGINATE is set to ORIGINATE for the originate Quick Setups...

Page 136: ...settings were changed but you cannot determine what options were changed From the SUMMARY screen choose SETUPS to change options AT to change options that are associated AT commands or S REG to chang...

Page 137: ...E SPEED 1 2 3 SETUP 6 SUMMARY 1 2 3 SUMMARY 609E SETUPS AT S REG 1 2 3 PRI addr 0011214E0 999 99 1 2 3 S REG 00 01 DEC INC 1 2 3 The four digit hexa decimal value in the upper right corner of the SUMM...

Page 138: ...R I 0 0 1 1 2 1 4 E 0 Speed limit type 0 V 32 V 32bis 1 V 33 2 Bell 208 Speed limit min bps 4 19 2 K 5 16 8 K 6 14 4 K 7 12 0 K 8 9600 9 7200 A 4800 B 2400 C 1200 D 600 E 0 300 F 1200 75 Speed limit...

Page 139: ...ier 0 disable 1 enable Disconnect TX space 0 disable 1 enable Disconnect RX space 0 disable 1 enable Auto answer 0 disable 1 enable EIA INTERFACE OPTIONS e i a 0 1 0 2 1 1 0 0 0 Test mode 0 normal 1 t...

Page 140: ...MNP class limit 0 class 1 1 class 2 2 class 3 3 class 4 4 class 5 Flow control DCE to DTE 0 none 1 CTS 2 DC1 DC2 3 DC1 DC3 Flow control DTE to DCE 0 none 1 RTS 2 DC1 DC2 3 DC1 DC3 Parity 0 none 1 odd...

Page 141: ...ellite delay 0 disable 1 enable RTS to CTS delay ms 0 none 1 15 2 50 3 150 CTS 0 always ON 1 follow RTS Carrier type 0 switched 1 constant Phase reversal in answer tone 0 enable 1 disable Auxiliary ch...

Page 142: ...handshake 0 T1 timer 1 V 32 bis Annex A Answer tone detection 0 disable 1 enable ALB make busy 0 disable 1 enable V 13 operation 0 off 1 TX only 2 RX only 3 TX and RX DTE DCE speed 0 disable 1 enable...

Page 143: ...fer to Table 5 1 Hayes Compatible Commands for an explanation of the commands represented in this diagram ATbeflmqvxy AT cdgjlpqrsx s00 s18 s25 s26 AT abcdeh kmnpq t vx 010210141 1210000000 001 000 00...

Page 144: ...S register HOW TO CHANGE S REGISTER VALUES Select the desired S register number then modify its value as follows Use the arrow pushbuttons to move the LCD cursor from one digit to the next Then selec...

Page 145: ...to MI MIC control Strap the modem for use in a DC rack enclosure Change the function of EIA interface pin 25 If you need to reset a jumper switch refer to the next page to determine the jumper that sh...

Page 146: ...145 Appendix D Jumpers Figure D 1 Modem Circuit Board Jumper Locations JP7 JP2 JP3 JP1 JP6 JP5 JP4 JP8...

Page 147: ...eration Set to same position JP5 JP6 A A1 control MI MIC control Set to same position JP7 Pin 25 used for analog Pin 25 used as test loopback input mode indicator output JP8 For factory use only Do no...

Page 148: ...vabo s tano mojado o cerca de una alberca etc 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser montado...

Page 149: ...contactos y recept culos donde salen del aparato 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber ser l...

Search results

Summary of Contents for MD885A-R2

Reviews:

Related manuals for MD885A-R2

Brands by name

Popular brands

Black Box MD885A-R2, User Manual

Search results

Summary of Contents for MD885A-R2

Reviews:

Related manuals for MD885A-R2

Brands by name

Popular brands