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APPENDIX D: DC Voltage Models

Appendix D: DC Voltage Models

D.1 Introduction

The modems with codes MD833A-D12, MD833A-D24, and MD833A-D48
are pre-configured for DC voltage operation. The MD833A-D12 is pre-
configured for use with a -12 VDC power source, the MD833A-D24 is pre-
configured for use with a -24 VDC power source, and the MD833A-D48 is
pre-configured for use with a -48 VDC power source.

This addendum provides installation and jumper information for the

DC pre-configured modems for applications where an external DC power
source will be used (i.e., not DC power provided from a rack enclosure).
If the modem is to be installed in a rack, refer to the instruction manuals
for the modem and the rack.

CAUTION

The -48 VDC model should be used only with an external DC power
source.

For modems using an external DC power source, the information in

this addendum about installation and jumper settings supersedes the
information in the rest of the Modem 32144 manual. However, all other
information in the instruction manual is applicable.

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Содержание 32144

Страница 1: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1999 Black Box Corporation All rights reserved...

Страница 2: ...operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measu...

Страница 3: ...x 9 7 D 6 4 x 25 7 x 24 6 cm Weight 4 lb 1 8 kg Standards Bell 103 212 208 CCITT V 13 V 17 V 22 V 32 V 22 bis V 25 V 32 bis V 33 V 29 V 32terbo Protocol Sync and async Data Rate Up to 16 8 and 19 2 Kb...

Страница 4: ...ually a computer If the modem will be operated in a manual dial mode you will also need a standard telephone set This instruction manual applies to the Modem 32144 All information applies to both the...

Страница 5: ...own on the liquid crystal display LCD 3 1 Methods for Selecting Options The modem allows you to easily select options in order to tailor the modem s operation to suit a particular application Options...

Страница 6: ...number to be used later for Autodialing from the front panel or using the Hayes or V 25 bis mode autodialer DTR dialing Leased line or dial line auto recovery This chapter describes the following feat...

Страница 7: ...apter a carriage return is required at the end of each command line For easy reference the following tables appear consecutively at the end of this chapter Hayes Compatible Commands Table 5 1 Hayes Mo...

Страница 8: ...ith the CCITT V 25 bis Recommendation the modem V 25 bis asynchronous Quick Setup sets the character length to 10 bits including 1 even parity bit Both V 25 bis synchronous Quick Setups set the modem...

Страница 9: ...ens accessed via the SUMMARY screen you should be able to determine which option settings have been changed by comparing the previous and current option parameters The troubleshooting information in t...

Страница 10: ...tup 10 29 2 7 2 Wire Dial Bell 208 Operation Quick Setup 11 12 30 2 8 Two Types of Bell 208 Operation 31 2 8 1 Bell 208 Operation Exclusive 31 2 8 2 V 32 208 Auto Select Mode 32 2 9 4 Wire Leased Line...

Страница 11: ...ions are shown in Appendix B Table A 1 shows the modem configuration i e the default setting for each option for each of the Quick Setup modes When you select a Quick Setup the modem automatically set...

Страница 12: ...nnot determine from this number which options have been changed After setting up the MODEM record this number for possible later reference Summary Setup is an advanced feature designed to allow exper...

Страница 13: ...is provided in Figure C 1 DIAG TX DIAL RX DIAL LEASED LINE and PHONE connectors and in Table C 1 DTE interface connector This appendix provides a detailed description of al modem connectors including...

Страница 14: ...installation and jumper information for the DC pre configured modems for applications where an external DC power source will be used i e not DC power provided from a rack enclosure If the modem is to...

Страница 15: ...is screen is displayed only if V 32bis mode is selected See reverse side of chart Set automatically in Hayes mode only Set automatically in Hayes mode only Hayes mode only Use S register S10 to change...

Страница 16: ...EMOTE CTRL ADDR C ADDR 2 LOCAL TEST ALB ALBST ST E 1 ANALOG LOOPBACK ON OFF ANALOG SELFTEST ON OFF SELFTEST w ERROR ON OFF LOCAL TEST DLB ALBX ALXST 2 DIGITAL LOOPBACK ON OFF ANALOG LOOP EXT ON OFF AN...

Страница 17: ...the external DC power source as shown in Fig D 1 Fig D 1 Attaching the supplied cable to the DC power source DIAG TX DIAL LEASED LINE PHONE POWER Black Red Pos source Neg source Refer also to Section...

Страница 18: ...tion as shown in Tables D 1 Table D 1 Jumper Settings for 12 24 48 VDC Operation Jumper s Setting JP2 Pins 2 and 3 connected JP3 JP4 Pins 1 and 2 connected set to same position For other jumper settin...

Страница 19: ...ngs are pre configured you should not have to change them Fig D 2 Partial view of modem circuit board showing jumper locations JP2 JP1 JP6 JP5 JP8 JP7 JP3 JP4 For each jumper pin 1 is identified by a...

Страница 20: ...NOTES...

Страница 21: ...NOTES...

Страница 22: ...NOTES...

Страница 23: ...NOTES...

Страница 24: ...NOTES...

Страница 25: ...NOTES...

Страница 26: ...PC PR RJ 11 1 2 3 4 5 6 Phone Connector Pin 2 3 4 5 Function A Ring Tip A1 RJ 11 1 2 3 4 5 6 Leased Line Connector Pin 2 3 4 5 Function RXLL TXLL TXLL RXLL RJ 45 1 2 3 4 5 6 7 8 Pin 1 2 7 8 Function...

Страница 27: ...ct CD CF 109 CD Modem 9 Testing voltage 10V P Modem 10 Testing voltage 10V P Modem 15 Transmit clock TC DB 114 Modem 17 Receive clock RC DD 115 Modem 18 Analog loopback ALB control1 CN DTE 20 Data ter...

Страница 28: ...MI MIC control Strap the modem for use in a DC rack enclosure or Change the function of EIA interface pin 25 If you need to reset a jumper switch refer to the following page to determine the jumper th...

Страница 29: ...o legend JP2 JP3 A1 A A1 control Set to same MI MI MIC control position JP4 JP5 AC AC power JP8 Alternate position DC power for Telco 48 VDC battery Set to same position JP7 TM output Pin 25 used as t...

Страница 30: ...each digit position within the group The possible parameters for each option B 2 1 SUMMARY SETUP PUSHBUTTON FUNCTIONS The three Summary Setup screens are different from all other modem screens in that...

Страница 31: ...thin the number string as indicated in the following diagrams Each digit position represents an option and the number in each digit position indicates the current option setting parameter The string o...

Страница 32: ...matic Dialer mode 0 off 1 Hayes 2 DTR dialing 3 V 25bis async 4 V 25bis sync character oriented 5 V 25bis sync bit oriented 6 Penril mode Character length bits 0 8 1 9 2 10 3 11 Data format 0 sync 1 a...

Страница 33: ...75 T1 timer sec 0 0 1 0 3 2 0 8 3 1 6 4 3 Carrier detect level dial dBm 0 51 1 41 2 34 TX level dial 0 programmable 1 permissive Disconnect RTS sec 0 off 1 20 2 40 7 140 Disconnect line current 0 ena...

Страница 34: ...3 Flow control DTE to DCE 0 none 1 RTS 2 DC1 DC2 3 DC1 DC3 Parity 0 none 1 odd 2 even 3 mark 4 space DTE pass through flow control 0 enable 1 disable Flyback buffer 0 enable 1 disable V 42bis 0 enable...

Страница 35: ...TX clocking 0 internal 1 received clocking 2 external Answer originate 0 answer 1 originate Auto recovery test interval min 0 10 2 40 3 60 Auto recovery return sec 0 off 1 10 2 40 3 60 4 120 Auto rec...

Страница 36: ...1 2 3 4 5 6 Rate renegotiation RRP 0 disable 1 enable 8 9 10 1 2 3 4 5 6 7 8 pump 2 0 0 0 0 0 1 1 0 0 0 pump 3 0 0 0 0 0 1 0 0 Turnaround delay 0 disable 1 enable Satellite delay 0 disable 1 enable RT...

Страница 37: ...ptions across the LCD The misc2 and misc3 options are identified below 1 2 3 0 0 0 0 Low profile DIAG LED 0 Connect status 1 DTR status CFI AB response on disconnect 0 disable 1 enable Multimode hands...

Страница 38: ...or Each AT Profile AT commands AT commands S registers AT commands most are for V 42 options ATbeflmqvxy 110210141 AT cdgjlpqrsx 1200000000 s00 s18 s25 s26 001 000 005 AT abcdfkmnpq t vx 3150130323300...

Страница 39: ...157 APPENDIX A Quick Setup Configurations Table A 1 Quick Setup Configurations...

Страница 40: ...158 MODEM 32144 Table A 1 Quick Setup Configurations continued...

Страница 41: ...159 APPENDIX A Quick Setup Configurations Table A 1 Quick Setup Configurations continued...

Страница 42: ...160 MODEM 32144 Table A 1 Quick Setup Configurations continued...

Страница 43: ...d Limit option V 32 V 32M V 32 14 4 V 32 14 4M V 32 19 2 V 32 19 2M MAX DCE 4800 9600 9600 9600 RATE MIN DCE 4800 4800 4800 4800 Default settings listed by Quick Setup mode Option Bell 2081 4 wire V 2...

Страница 44: ...Options DATA TYPE Sync Sync Sync Sync CHAR 10 10 10 10 LENGTH PARITY None None None None Disconnect Options RX SPACE Disable Disable Disable Disable DISC T TX SPACE Disable Disable Disable Disable DI...

Страница 45: ...ormal Normal Normal Normal DSR to EIA Normal True True True DTR from EIA Normal True True True ALBT DTE Disable Disable Disable Disable CTRL ED RDL DTE Disable Disable Disable Disable CTRL ED TM to EI...

Страница 46: ...Quick Setup mode AUTO Enable Enable Disable Disable RETRAIN ANS ORG ORIG ORIG ORIG ANS DEFAULT ANS TONE 2100 Hz 2100 Hz 2100 Hz 2100 Hz FRONT Enable Enable Enable Enable PANEL SPKR CTRL Til CD Til CD...

Страница 47: ...ditional Quick Setup Configurations Auto Recovery Options AUTO RECV None None None None SELECT AUTO RECV OFF OFF OFF OFF RETURN AUTO RECV 20 min 20 min 20 min 20 min TEST INT VL AUTO RECV INTER INTER...

Страница 48: ...166 MODEM 32144 Do not Make PDF of this page...

Страница 49: ...and Bell 208A B Options 65 3 16 Options Accessible Only via Summary Setup 67 3 16 1 Dial Line Options 67 3 16 2 V 42 Error Correction Options 67 3 16 3 Data Pump Options 69 3 16 4 Miscellaneous Option...

Страница 50: ...g APP 91 4 13 2 Clearing the Password 92 4 14 Manual Response Password Protection MPP 92 4 15 Commands for Enabling MPP 93 4 16 How to Use Password Commands 94 5 Hayes Emulation Mode 97 5 1 Hayes Mode...

Страница 51: ...Diagnostics 144 7 8 1 Analog Loopback ALB Test 144 7 8 2 Analog Loopback Self Test ALBST 145 7 8 3 Analog Loopback Self Test with Errors ST E 147 7 8 4 External Analog Loopback ALBX Test 147 7 8 5 Ex...

Страница 52: ...9 MODEM 32144 Appendix D DC Voltage Models 181 D 1 Introduction 181 D 2 Installation 182 D 3 Jumper Settings 183 D 4 Jumper Locations 184 Appendix E LCD Flow Chart 185...

Страница 53: ...local modem diagnostics Analog loopback ALB Analog loopback self test ALBST Analog loopback self test with errors ST E External analog loopback ALBX External analog loopback self test ALXST Digital l...

Страница 54: ...d in Section 5 4 The duration of a test can be set by assigning 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...

Страница 55: ...ns also show the software revision levels which are also shown on the power on screen 7 6 2 OTHER STATUS SCREENS QUALITY SCREEN The quality screen displays the quality of the received signal carrier a...

Страница 56: ...he modem from the DTE PACKET SCREEN The packet screen functions only when error correction is enabled It has three components as explained next SIZE Shows size of data packets MNP or blocks V 42 V 42...

Страница 57: ...the next lower speed If you select UP the modem will fall forward to the next higher speed if the signal quality is good enough The range within which the modem can fall forward or fall back is limit...

Страница 58: ...dem is attached to DTE or an external BERT 7 8 1 ANALOG LOOPBACK ALB TEST Analog loopback testing allows the user to test the local modem and its associated terminal independently from the telephone i...

Страница 59: ...the possible selections Select ON to activate the test In general the DSR during ALB test option discussed in chapter should be left ON the default selection to avoid disrupting the DTE and DTE softw...

Страница 60: ...tor may flash on when the test is first turned on but it should quickly go out and remain off until the end of the test TRANSMITTER PATTERN GENERATOR RECEIVER PATTERN DETECTOR In Hayes mode only the A...

Страница 61: ...s indicating that the pattern generator and detector are working Errors are injected every few seconds To end the test press the ENT pushbutton to return to the SELFTEST W ERROR screen and then select...

Страница 62: ...dem that the data rate is the same as that of the DTE and that the DTR circuit is on If TR is present on the EIA status screen the DTR circuit is on From screen 2 of the LCD MAIN MENU select TEST Go t...

Страница 63: ...n though no data is being received this is normal On a flat line the MODEM modem in ALBX test mode will train and remain running across the following range of signal loss in V 32 mode 0 51 dBm 0 52 dB...

Страница 64: ...s of both the inbound and out bound channels amplitude distor tion delay distortion noise etc The main purpose of the ALXST is to verify that the modem is connected to the leased line and that the lea...

Страница 65: ...e information at the end of the previous section for the ALBX test concerning signal loss loss of carrier and loss of RTS also apply to the ALXST To end the test press the ENT pushbutton to return to...

Страница 66: ...the LCD MAIN MENU select TEST Go to screen 2 of the LOCAL TEST menu and select DLB The DIGITAL LOOPBACK screen will be displayed with ON and OFF as the possible selections Select ON to activate the t...

Страница 67: ...not be initiated unless the Remote Test option is enabled on the remote modem This option also REMOTE TEST on the LCD is accessed via SETUP screen 4 7 9 1 REMOTE DIGITAL LOOPBACK RDL TEST The RDL test...

Страница 68: ...ade during the test DATA TERMINAL EQUIPMENT DTE AT LOCAL SITE LOCAL MODEM RECEIVER REMOTE MODEM TRANSMITTER RECEIVER TRANSMITTER From the REMOTE DIGIT LOOP screen select ON to activate the test The st...

Страница 69: ...From the REMOTE TEST menu select RDLST From the RDL SELFTEST screen select ON to activate the test The status screen will be displayed as the test is being conducted If ER is present on the status sc...

Страница 70: ...ER screen this will not enable DTR dialing for V 25 bis mode The Summary Setup Penril V25 bis DTR dialing option applies to either V 25 bis mode or Penril mode whichever is enabled therefore for V 25...

Страница 71: ...ming calls The DIC command is canceled when the CIC command is issued or the modem is reset In the event of a reset the modem will answer if auto answer is enabled from the front panel PRN PROGRAM NOR...

Страница 72: ...ill show the stored numbers as follows LSN 0 301 555 1234 LSN 1 301 123 4567 LSN 2 301 555 5555 and so on through phone cell 9 If a phone cell number is specified after RLN e g RLN 5 the DTE display w...

Страница 73: ...rogram normal store number or 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 stor...

Страница 74: ...L Links a phone number to another number to be dialed as an alternate when the primary number is busy or does not answer See L Link in Section 5 4 P Sets pulse dialing mode T Sets tone dialing mode W...

Страница 75: ...d 0 9 Can only be tone dialed A B C D and Wait for silence exclamation Flash hook L P T and W may be entered as upper or lowercase letters Spaces or hyphens may be used as separators for clarity they...

Страница 76: ...ilure because of busy signal ORG Engaged tone CFI ND Call failure no dial tone Modem did ORG not detect dial tone or line current during dialing or handshaking CFI NS Call failure call request specifi...

Страница 77: ...RG INC Incoming call ANS INV CU Invalid command unknown ANS ORG INV MS Invalid message command syntax ANS ORG INV PS Invalid parameter value Specified ANS ORG parameters are out of range for command u...

Страница 78: ...ARK MESSAGE CR LF MARK This format uses one start bit 8 bit data units and a 1 unit stop bit The 8 bit data units are formed by a 7 bit IA5 character and an even parity bit 6 5 2 SYNCHRONOUS CHARACTER...

Страница 79: ...DR CTRL MESSAGE FCS FLAG Consecutive 8 bit data units are used within the message and submitted to the HDLC framing zero insertion The 8 bit data units are formed by a 7 bit IA5 character and an off p...

Страница 80: ...on or spaces can be included in the telephone number to make it easier to read 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...

Страница 81: ...aining digits MISSING PARAMETER A missing parameter is interpreted as a zero For example the E command echo can be sent as either E0 or E1 but if an E alone is sent the modem will interpret it as if a...

Страница 82: ...tting a switch in the hardware or by issuing a software command Refer to your computer documentation When the modem originates a call it automatically detects and adjusts to the transmission speed set...

Страница 83: ...rameters and default value for each command are shown in Table 5 1 A ANSWER The A command immediately puts the modem into the answer mode The modem will not execute any command entered in the command...

Страница 84: ...ers may be stored in memory locations 0 9 S m may be placed anywhere in the dial string for example AT D2345S 2 will dial 2345 and the number stored in memory location 2 H TELEPHONE SWITCH HOOK The H...

Страница 85: ...cation 2 assuming a connection cannot be made and the L0 command stored in location 2 directs the autodialer back to location 0 The numbers will be dialed in a loop until a connection can be establish...

Страница 86: ...wait time 30 seconds by default can be adjusted by changing the value in register S7 If no dial tone is detected within the specified time the modem will hang up and give a NO DIALTONE result code if...

Страница 87: ...he modem to go on hook for 1 2 second This has the same effect as holding the switch hook button on your telephone down for 1 2 second You may be able to use this command for transferring calls F RECA...

Страница 88: ...he syntax is Zm n where m specifies the memory location where the phone number or dial string will be stored and n is the number or dial string to be stored For example AT Z5 T1 301 555 1212 will stor...

Страница 89: ...llows S9 The decimal value of the register contents will then be displayed Multiple registers may be read For example if you wish to read the current value in registers S0 and S7 enter AT S0 S7 A typi...

Страница 90: ...ration only The line feed character follows the carriage return only when word result codes have been selected command V1 Line feed can be changed to a null but cannot be totally disabled S5 BACKSPACE...

Страница 91: ...If the guard time is zero timing will not be a factor at all The three escape characters can occur with any timing relationship but they must be consecutive Be cautious when assigning small guard time...

Страница 92: ...ault profile The modem is shipped from the factory with profile 0 as the default profile As explained in the following sections the modem is programmed to treat profile 0 and profile 1 differently Use...

Страница 93: ...tive configuration the LCD screens will not be affected This means that when profile 1 is active it is possible for the LCD to display an option setting that does not reflect the setting currently in...

Страница 94: ...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 in local command mode F1 Mo...

Страница 95: ...or each EPROM programmable memory unit chip part and revision number checksum I4 Reserved L SPEAKER VOLUME L0 or L1 Low speaker volume L2 Medium volume L3 High volume M SPEAKER CONTROL M0 Speaker alwa...

Страница 96: ...E X0 Selects basic result codes 0 4 Modem will blind dial without dial tone X1 No speed indication no busy or dial tone detect X2 Selects result codes 0 6 10 11 13 14 15 and 18 X3 Same as X1 except bu...

Страница 97: ...TA CARRIER DETECT CONTROL C0 DCD always ON when DTR is present C1 DCD ON only in the presence of suitable data C2 DCD ON when DTR is present then toggles off for 500 ms upon disconnect D DATA TERMINAL...

Страница 98: ...the modem is a US or international model Q ASYNCHRONOUS SYNCHRONOUS MODE Q0 Asynchronous mode Q1 Synchronous mode 1 Synchronous asynchronous mode Q2 Synchronous mode 2 OFF to ON DTR causes the modem t...

Страница 99: ...em for a remote digital loopback test self test T6 Initiates a remote digital loopback test T7 Initiates a remote digital loopback test self test T8 Initiates a local analog loopback self test V VIEW...

Страница 100: ...prevent a connection from being made A1 Disables keyboard abort B BUFFER MODE SPEED CONVERSION 1 B0 Disables speed conversion B1 Enables speed conversion C MNP CLASS LIMIT 1 C1 Limits operation to MN...

Страница 101: ...V 42 MODE 1 N0 Disables error correction N1 Enables mandatory mode for error correction N2 Disables error correction N3 Enables automatic mode for error correction 1Option can be changed only when the...

Страница 102: ...missive transmit level L1 Selects programmable transmit level S VIEW STATUS OF V 42 RELATED CONFIGURATION No parameters T LOAD INACTIVITY TIMER T0 Disables inactivity timer Tn Sets inactivity timer to...

Страница 103: ...ocess of accepting a command However the modem will answer the call only if it is set for automatic answer or is given an A command 3 NO CARRIER Carrier lost or never detected 4 ERROR Error in command...

Страница 104: ...Modem is dialing numbers that ve been linked using the L link dial modifier 21 CONNECT 16 8 Carrier detected at 16 8 Kbps 22 CONNECT 19 2 Carrier detected at 19 2 Kbps 72 DIALING Modem is dialing 73...

Страница 105: ...200 30 4800 38 4800 46 4800 57 9600 31 2400 39 2400 47 2400 58 4800 32 1200 40 1200 48 1200 59 2400 33 600 41 600 49 600 60 1200 34 300 42 300 50 300 61 600 35 110 43 100 51 110 62 300 53 38400 54 384...

Страница 106: ...re listed Register Range Units Default Description S0 0 255 rings 1 Ring to answer on S1 0 255 rings 0 Counts the number of rings S2 0 127 ASCII 43 Escape code character S3 0 127 ASCII 13 Carriage ret...

Страница 107: ...intended for user access are listed 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 sec 6 Carrier detect re...

Страница 108: ...70 Tone spacing S12 0 255 1 50 sec 50 Escape code guard time S18 0 255 sec 0 Test timer S25 0 255 sec or 5 Delay to DTR 1 100 sec1 S26 0 255 1 100 sec 0 RTS to CTS delay half duplex S43 Speed limit ma...

Страница 109: ...Use pushbutton 1 to decrease a number at the current cursor location or pushbutton 3 to increase a number Use pushbutton 2 CTRL to cycle through the dialing control characters The dialing control char...

Страница 110: ...ith R R A D Used in some PBX applications tone dialing only R Configures modem for Dial Line Auto Recovery Requires prefix See Dial Line Auto Recovery section later in this chapter period Marks end of...

Страница 111: ...23 fallback operation Operating mode fallback functions when the modem is in either manual or automatic originate mode or manual or automatic answer mode For communication within the United States us...

Страница 112: ...e other modem does not support V 32 or V 32 bis the modem will fall back to one of the modes listed below The fallback modes are listed in the order in which they are attempted by the modem in normal...

Страница 113: ...tup options The factory default setting for RRP is enabled To change the RRP option refer to Appendix B Fig B 7 Change the Rate Regeneration Procedure RRP parameter shown in the diagram to 0 disable o...

Страница 114: ...chronous operation the Bell 208 and V 32 208 Quick Setups default to synchronous operation Any of these three Quick Setups will set the modem to originate mode If you want to set your modem to answer...

Страница 115: ...her person must wait until he hears an answer tone and then switch to data mode select DATA When both modems are in data mode the data communication will begin The LCD will display the status of the c...

Страница 116: ...ons such as certain network environments may require control of a remote CD signal by a local Request to Send RTS signal V 13 operation allows local RTS control of a remote CD signal without actual ON...

Страница 117: ...l Line Auto Recovery The Dial Line Auto Recovery feature allows you to setup the modem for a dial up application so it will automatically redial to restore a broken connection if the modem goes on hoo...

Страница 118: ...modem will redial but it is programmed not to exceed more than 10 redial attempts in 1 hour 4 9 Leased Line Auto Recovery The Leased Line Auto Recovery feature allows the modem to automatically resto...

Страница 119: ...ery Return option is enabled see below the modem will automatically exit the Auto Recovery mode when the leased line conditions are satisfactory Any normal disconnects such as loss of carrier or line...

Страница 120: ...ode indefinitely unless you select HANGUP from the AUTO DIAL screen or unless a loss of line current or other normal disconnect occurs Either event will return communication to the leased line NOTE Th...

Страница 121: ...ade if both modems are preprogrammed with the same password and if the answer modem is preprogrammed with the number of the originating modem the callback phone number APP with callback is for dialup...

Страница 122: ...used is stored in nonvolatile memory so it will be maintained if the unit loses power or upon a quick soft reset However a factory reset will clear the automatic password and callback number if used...

Страница 123: ...ny password will do even a single charac ter except that it should not be the same as the user pass word and it should not be the same as any other password stored in the answer modem s memory for APP...

Страница 124: ...d callback operation will not function No spaces between the letters are allowed except that the user password as entered on the front panel must end with a space Clear Password Confirmation Screen CO...

Страница 125: ...configuring the modems for APP with callback is to store the user password in the answer modem s memory along with the callback phone number as explained below From the DTE use the Hayes AT Z command...

Страница 126: ...he change password screen will be displayed With the cursor in the first character position press pushbutton 2 SKIP until a space appears flashing Then press ENT The password will be disabled With the...

Страница 127: ...ring telephone numbers passwords and or the MPP password commands listed in Table 4 4 To implement a security command use the Hayes AT Z command to store the command in a specific memory location The...

Страница 128: ...swords entered via the DTE interface but these characters cannot be entered via the modem s front panel A phone number cannot be stored after Commands Only one command A P or U can be stored in each m...

Страница 129: ...k the V and Z commands enter AT Z The DTE will respond with OK and the V or Z commands will not function until they are unlocked To Program MPP without Callback Operation Use the commands AT Z and P t...

Страница 130: ...h T used to specify tone dialing the password is CANARY A remote user can now call from the specified callback number 555 1212 After the modems connect the remote user presses the DTE Enter key once T...

Страница 131: ...ENU SCREEN EXITS FROM DISPLAYED SCREEN 1 2 3 ENT USED TO SELECT CHOICE 1 2 OR 3 FROM THE LCD Each of the possible selections on the bottom line of the LCD is identified as 1 2 or 3 below the LCD Arrow...

Страница 132: ...atedly after you have arrived at MAIN MENU screen 1 will cause the LCD to alternate between the EIA status screen and the MAIN MENU In the case of most tests the ENT button cannot be used to exit the...

Страница 133: ...er can be changed Selecting DEC pushbutton 1 will decrease the value selecting INC pushbutton 3 will increase it SETUP QUICK LINE SPEED 1 1 2 3 LCD Front panel When an option is first selected it will...

Страница 134: ...en you must first access MAIN MENU screen 2 then SETUP screen 4 and then MODEM SETUPS screen 5 as explained below After powering on the modem press ENT to get the first screen of the MAIN MENU Press t...

Страница 135: ...r profile 0 or 1 depending on which has been designated as the default see Y command To entirely reconfigure the modem to the state it was in when shipped from the factory hold in the right arrow push...

Страница 136: ...ation See Chapter 2 and Appendix A Line Type All modes 2W D This selection 2 wire dial line is used for dialup applications 2W LL This selection 2 wire leased line is used for leased line applications...

Страница 137: ...xx 9600 or 48003 Dial modes Originating 300 to 19 200 OFF or DTR Negotiated between min and max setting EIA CTRL OFF or DTR 9600 or 48003 xx HAYES4 Negotiated between autobaud speed and minimum settin...

Страница 138: ...V 33 and Bell 208 handshakes However the modem only can be configured for either V 33 or Bell 208 compatibility and for Bell 208 operation To determine if a modem supports Bell 208 operation see Sect...

Страница 139: ...ally uses the V 32 handshake The modem also uses this handshake for V 32 14 4 Kbps operation V 33 operation is available on the modem for 4 wire leased line synchronous operation only The available da...

Страница 140: ...n RTS CTS delay time For further information see the Carrier CTS and RTS CTS Delay headings later in this chapter For further information on Bell 208 mode see chapter section titled Dumb Mode and Bell...

Страница 141: ...options and Pass through Flow Control All of these options affect the type of error correction selected via the V42 SELECTION screen discussed below except that the MNP Class option is applicable only...

Страница 142: ...mpression over the transmission link V 42 Selection Options The following two options are available through the V 42 SELECTION screen Protocol Hayes V 25 bis Dumb Leased line modes except V 33 LAPM MN...

Страница 143: ...ention packet is sent DESTRUCTIVE EXPEDITED DESTR EXP All data in the buffer is deleted the attention packet is then passed through the channel NON DESTRUCTIVE EXPEDITED NDT EXP The attention packet i...

Страница 144: ...TS should not be permitted for long periods if possible to reduce the possibility of buffer overflow This option controls the DTE speed however it is effective only when the modem is operating in V 42...

Страница 145: ...through flow control Tx link flow control DCE pass through flow control Rx link flow control DTE pass through flow control Tx link flow control DCE pass through flow control Rx link flow control Rx li...

Страница 146: ...left are the group address number To change the address use the right and left arrow pushbuttons to go to the DC1 DC2 This option inserts the control characters R and Q into the data stream to stop an...

Страница 147: ...s Dumb 208 V 32 208 modes This option determines whether or not a call is automatically answered when the phone rings digit you want to change Then use pushbutton 1 to decrease DEC a number and pushbu...

Страница 148: ...ion only This option selects a character length of 9 10 or 11 bits for character asynchronous operation The same character length must be selected for both the local and the remote modems Use pushbutt...

Страница 149: ...e the line to be disconnected To set this option for Hayes mode use S register S10 In Hayes mode autobaud overrides the front panel parity setting this occurs when the modem receives the AT attention...

Страница 150: ...hen the modem is in the analog loopback test mode In general this option should be left ON the default selection Remote Test All modes The Remote Test option allows you to prevent remote digital loopb...

Страница 151: ...ion To set CTS ON refer to Appendix B Fig B 4 EIA INTERFACE OPTIONS diagram Note that if you set CTS to ON using Summary Setup and then make a selection from the CTS to EIA screen the selection from t...

Страница 152: ...modes Remote digital loopback RDL testing can be initiated from the DTE via pin 21 Positive voltage activates the test whereas negative voltage results in normal operation Disabling this option keeps...

Страница 153: ...es This option sets the threshold for the ER error indication during normal operation You can choose either 10 3 one error in 1000 bits or 10 5 one error in 100 000 bits The settings of the Signal Qua...

Страница 154: ...circuits is provided by an internal clock within the modem RECEIVED RX CLK The timing of the data received from the remote modem is used to control the timing of the trans mitted data This timing mode...

Страница 155: ...one of the V 32 rates 4800 to 14 4 Kbps It also applies to the V 22 bis rate 2400 bps for dial operation only ANSWER The modem is set to answer mode ORIGINATE The modem is set to originate mode Answe...

Страница 156: ...cuits in one of these modes you should turn the guard tone option OFF If guard tones are required their frequency can be set to 550 Hz or 1800 Hz the most commonly used guard tone frequency V 13 Opera...

Страница 157: ...208 Auto Detect Mode later in this chapter Carrier Type V 33 208 V 32 208 modes SWITCHED SWITCH For 2 wire applications the carrier type option must be set for switched carrier operation CONSTANT Cons...

Страница 158: ...V 13 Operation option is set to TX ONLY or TX AND RX the actual RTS CTS delay time may differ from the selected RTS CTS Delay setting The actual RTS CTS delay depends on the data rate as shown in Tabl...

Страница 159: ...sion command ENABLE This setting allows the modem to request retransmission of a single information frame in the event of a transmission error DISABLE Data can be retransmitted only in a series of inf...

Страница 160: ...rt restart data transmission to the remote modem A DC3 control character will cause the modem to stop data transmission and hold data in its buffer until it receives a DC1 control character which inst...

Страница 161: ...If the modem detects an energy loss during the delay it turns CD on 52 ms after detecting the loss If the modem does not detect an energy loss it turns CD on 52 ms after the end of the delay The mode...

Страница 162: ...V 22 bis handshake To allow the modem to connect properly with certain manufacturers V 22 bis modems that do not conform fully with the V 22 bis standard the modem s S1 signal duration may have to be...

Страница 163: ...ed T1 TIMER If the T1 timer setting is selected the modem will attempt to handshake with a calling V 32 modem for the time specified by the T1 Timer option V 32 bis ANNEX A If the V 32 bis Annex A set...

Страница 164: ...ption is enabled the originate modem will also send a CFI AB result code upon call disconnect ON The state of RTS input EIA pin 4 will be signaled to the remote modem s CD output and CD pin 8 on the l...

Страница 165: ...change the function of the DIAG LED on low profile modems Appendix D as explained below CONNECT STATUS DIAG LED on indicates the modem s diagnostic port is actively connected DIAG LED off indicates t...

Страница 166: ...lug the eight pin connector end of the cable into the modem jack labeled TX DIAL Then plug the six pin connector end into the telephone line modular wall jack Do not bundle the telephone and EIA inter...

Страница 167: ...OWER TRANSFORMER DIAL LINE LEASED LINE TELEPHONE HANDSET NOT REQUIRED FOR ALL APPLICATIONS 2 1 3 JUMPERS For most applications you don t need to reset internal jumper switches However jumper switches...

Страница 168: ...o use the pushbuttons and liquid crystal display LCD on the modem s front panel These features are shown in Fig 2 2 LIQUID CRYSTAL DISPLAY LCD 1 PUSHBUTTONS FRONT PANEL 2 3 ENT 1 2 3 Fig 2 2 Pushbutto...

Страница 169: ...andshaking with another modem attempting to establish a connection When the modem is off line the word idle is displayed in the same position V 32 bis 19 2M Version 3 02 The numbers displayed in the l...

Страница 170: ...Setup configuration follow the steps below As you do you may find it helpful to refer to the LCD flow chart that is shipped with the modem 1 Press the ENT enter pushbutton on the modem s front panel S...

Страница 171: ...flash on and off 5 Press the ENT button twice As you do this you will see SETUP screen 1 then after you press the ENT button a second time the modem will reset It is at this point that the selected Q...

Страница 172: ...at use Hayes style AT commands The Hayes mode Quick Setup is the factory default configuration for the modem QUICK SETUP 2 2 Wire Dial V 25 bis Mode V25 DIAL Async Asynchronous In V 25 bis mode the mo...

Страница 173: ...plications dial a previously stored telephone number from the front panel or dial phone numbers via an external source telephone QUICK SETUP 6 2 Wire Leased Line Originate Mode 2 W LEASED ORG In Lease...

Страница 174: ...line type and modem answer originate status Use Quick Setup 9 if the leased line is a 4 wire line and you want to configure the modem as the answer modem QUICK SETUP 10 V 33 Leased Line Operation Thi...

Страница 175: ...modems QUICK SETUP 14 V 29 Fast Master Mode V 29 FAST MASTER This Quick Setup configures the modem for V 29 fast train master operation for use in a multidrop network where multiple remote slave modem...

Страница 176: ...2144 Table 2 2 Quick Setup Modes Supported Quick Setup V 32 19 2M Hayes 01 Y Y V 25bis 02 04 Dumb 05 Leased 06 09 V 33 10 N Y Bell 208 11 12 N Y V 29 13 15 N Opt Y Yes supported N No not supported Opt...

Страница 177: ...ge return CR or period is required at the end of each command line On most keyboards the carriage return CR key is labeled Enter or Return In response to the command line shown above the modem will di...

Страница 178: ...d DTE If you have selected the correct V 25 bis Quick Setup the data protocol will be set automatically to the correct setting V 25 bis mode operation and commands are explained in detail in Chapter 6...

Страница 179: ...be changed The characters that can Synchronous V 25 bis Operation In synchronous applications the V 25 bis commands can be used to facilitate computer controlled operations Synchronous bit oriented o...

Страница 180: ...select DIAL from the AUTO DIAL screen When the local modem has successfully established a connection with the remote unit the EIA status screen should be present Typically this screen will look like t...

Страница 181: ...the other to answer mode If you have selected the correct Leased Line Quick Setup the answer originate status will be set automatically to the correct setting Leased line operation is restricted to da...

Страница 182: ...hed a connection with the remote unit the EIA status screen should be present Typically the screen will look like this 2 7 2 Wire Dial Bell 208 Operation Quick Setup 11 12 The modem supports Bell 208...

Страница 183: ...ick Setup identified on the LCD as 2 W DIAL 208 configures the modem for 2 wire dial synchronous operation compatible with Bell standard 208B The data rate is fixed at 4800 bps and the data format is...

Страница 184: ...s Lines can be conditioned or unconditioned After you select the 4 Wire Leased Line V 29 Quick Setup the modem will send a training sequence and wait for a training response from the remote modem The...

Страница 185: ...to originate mode and the other to answer mode To make this selection use the ANS ORG DEFAULT screen on the front panel LCD 3 Configure the modems for leased line auto recovery as explained in Chapte...

Страница 186: ...onds The assumption is that if RTS is held on for more than 30 seconds there is a fault in the DTE NOTE See page 176 pump 3 to enable anti streaming The V 29 Fast Master and Fast Slave modes support s...

Страница 187: ...ing up or using the modem try the remedies described below If you suspect a system malfunction follow the diagnostic procedures described in Chapter 7 If you cannot resolve the problem call Technical...

Страница 188: ...raction occurs result codes for incoming calls should be suppressed using the command AT Q2 2 11 3 ALL ASYNCHRONOUS MODES The modem s default DTE speed is 38 400 bps in asynchronous mode If the local...

Страница 189: ...screen If the signal quality appears to be inadequate see Section 7 6 2 or if the modems are frequently retraining try changing the equalization option 2 11 6 LEASED LINE EXCLUDING V 33 AND V 29 OPERA...

Страница 190: ...RD Modem 4 CA Request to send RTS RS DTE 5 CB Clear to send CTS CS Modem 6 CC Data set modem ready DSR MR Modem 7 AB Signal ground SG Ground 8 CF Carrier detect CD CD Modem 9 P Testing voltage 10V Mo...

Страница 191: ...Pin Assignments EIA Interface Connector continued Pin Designation Function LCD Indicator Source 22 CE Ring indicator RI R Modem 23 CH Speed select DTE 24 DA External transmit clock DTE 25 CN Test mod...

Страница 192: ...camente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuari...

Страница 193: ...iado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber ser localizada lejos de las lineas de energia 16 El cable de corriente deber ser desconect...

Страница 194: ...4 TRADEMARKS TRADEMARKS All applied for and registered trademarks are the property of their respective owners...

Страница 195: ...ort 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com DECEMB...

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