Black Box MD278A, MD278A-R2, MD278C User Manual
To order or for technical support: Call 724-746-5500 or fax 724-746-0746
Technical support and fax orders 24 hours a day, 7 days a week
Phone orders 24 hours, 7 A.M. Monday to midnight Friday; Saturday 8 to 4 (Eastern)
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
CUSTOMER
SUPPORT
INFORMATION
FEBRUARY 1998
MD278A
MD278A-R2
MD278C
Modem 325
Modem 325 Card
YES
CS
R
TALKDATA
NO
TD
RD
CD
RS
Modem 325
R
QM
FEDERAL COMMUNICATIONS COMMISSION
AND
CANADIAN DEPARTMENT OF COMMUNICATIONS
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is,
in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been
tested and found to comply with the limits for a Class A computing device in accordance with the specifications in
Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when
the equipment is 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 measures may be
necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio
Interference Regulation of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de
classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par le ministère des Communications du Canada.
INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)
1. Todas las instrucciones de seguridad y operación
deberán ser leídas antes de que el aparato eléctrico
sea operado.
2. Las instrucciones de seguridad y operación deberán
ser guardadas para referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus
instrucciones de operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser
seguidas.
5. El aparato eléctrico no deberá ser usado cerca del
agua—por ejemplo, cerca de la tina de baño, lavabo,
sótano mojado o cerca de una alberca, etc.
6. El aparato eléctrico debe ser usado únicamente con
carritos o pedestales que sean recomendados por el
fabricante.
7. El aparato eléctrico debe ser montado a la pared o al
techo sólo como sea recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al
equipo eléctrico más allá a lo descrito en las
instrucciones de operación. Todo otro servicio deberá
ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera
que su posición no interfiera su uso. La colocación del
aparato eléctrico sobre una cama, sofá, alfombra o
superficie similar puede bloquea la ventilación, no se
debe colocar en libreros o gabinetes que impidan el
flujo de aire por los orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance
de fuentes de calor como radiadores, registros de
calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.
11. El aparato eléctrico deberá ser connectado a una
fuente de poder sólo del tipo descrito en el instructivo
de operación, o como se indique en el aparato.
12. Precaución debe ser tomada de tal manera que la
tierra fisica y la polarización del equipo no sea
eliminada.
13. Los cables de la fuente de poder deben ser guiados de
tal manera que no sean pisados ni pellizcados por
objetos colocados sobre o contra ellos, poniendo
particular atención a los contactos y receptáculos
donde salen del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de
acuerdo a las recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser
localizada lejos de las lineas de energia.
16. El cable de corriente deberá ser desconectado del
cuando el equipo no sea usado por un largo periodo
de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos
liquidos no sean derramados sobre la cubierta u
orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto
cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado
dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o
muestra un cambio en su desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido
dañada.
MODEM 325 AND MODEM 325 CARD
6
TRADEMARKS
Other product names mentioned in this manual may be trademarks or registered trademarks of their
respective companies and are hereby acknowledged.
CONTENTS
7
CONTENTS
1. Specifications. . . .......................................................14
2. Introduction . . . .......................................................15
2.1 General . . . .......................................................15
2.2 Description . . . . . . . . . . . . . ..........................................15
2.2.1 Functional. . . . . . . . . . ..........................................15
2.2.2 Physical. . . . . .................................................15
2.3 How to Use this Manual .............................................17
2.3.1 Specifications . . . . .............................................17
2.3.2 Option Selection. . . . ...........................................17
2.3.3 Quick Startup. . . . .............................................17
3. Installation . . . . . . . . . . . ................................................18
3.1 General . . . .......................................................18
3.2 Site Selection. . . . . .................................................18
3.2.1 Tools Required. . . . . . . . . . . . . . . . . . . . . . . . . . . .....................18
3.2.2 Receipt Inspection .............................................18
3.3 Electrical Installation . . . . ...........................................18
AC Power Connection . . . . ...........................................19
3.4 DTE Connection. ..................................................19
3.5 Telephone Cables . . . . . . ............................................23
3.6 Telephone Line Connection..........................................24
3.6.1 PSTN Connection .............................................24
3.6.2 Permissive. . . . . . . . . . ..........................................24
3.6.3 Programmable . . . . . . . . . . . . . . . . . . . . . . . . . . . .....................24
3.6.4 Leased-Line Connection . . . . . . ..................................26
4. Option Selection . . . . . . . . . . . . . ..........................................28
4.1 General . . . .......................................................28
4.2 Strap Option Selection . . . . ..........................................28
Removing Cover . ..................................................28
4.3 Hardware Straps. ..................................................31
4.3.1 Tip and Ring Polarity ..........................................31
4.3.2 Ground Option Strap ..........................................31
4.3.3 QM Disable Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........32
4.4 LCD Option Selection . . . . ..........................................32
4.5 Main Menu . . . . . . . . . . . . . ..........................................32
Menu Sequence . . . . . . . . . . ..........................................32
4.6 Option Selection . ..................................................40
4.6.1 Main Menu. ..................................................40
4.6.2 Submenu . . . . . . . . . . ..........................................40
4.6.3 Submenu Item . . . . . . . . . . . . . . . . . . . . . . . . . . . .....................40
4.6.4 Item Option . . . . . . ............................................41
4.6.5 Selecting the Option . ..........................................41
5. Operation . . . . . . . . . ...................................................42
5.1 General . . . .......................................................42
5.2 Controls and Indicators .............................................42
5.3 LED Descriptions . . . . . . ............................................42
5.3.1 Request to Send . . . . ...........................................42
5.3.2 Clear to Send . . . . .............................................42
5.3.3 Quality Monitor . . . . ...........................................42
MODEM 325 AND MODEM 325 CARD
8
5.3.4 Carrier Detect . . . . ............................................42
5.3.5 Received Data. . . . . . . ..........................................42
5.3.6 Transmit Data. . . . . . . ..........................................42
5.4 Getting on Line Quickly. . . ..........................................42
5.4.1 Manual Dialing. . . . ............................................43
5.4.2 Manual Answering . . . ..........................................43
5.4.3 Autodial (Front Panel) . . . .......................................43
5.4.4 AT Command Dialing . . . .......................................43
5.4.5 Software Communication Packages................................43
5.5 Error Control . . . . . . . ..............................................43
5.6 Flow Control . . ....................................................44
5.7 Autobaud . . . . ....................................................44
5.8 4-Wire Operation . . . . . . . . . . . .......................................44
5.9 2-Wire Operation . . . . . . . . . . . .......................................44
5.9.1 2-Wire Leased-Line Operation ...................................44
5.9.2 2-Wire Dial-Up Operation . . . . . . .................................45
5.10 Remote Configuration. . . . . . . .......................................45
5.11 Secure Operation. . . . . . . . . . . .......................................45
5.11.1 Operating Without Security . . . . . . ..............................46
5.11.2 Operating With Security . . . . . . .................................46
5.11.3 Remote Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........46
5.11.4 Local Operation . . . . . . . .......................................46
5.11.5 Passwords . . . . . . .............................................46
5.11.6 LCD Indication of Security . . . . . . ...............................46
5.11.7 Security Reset. . . . ............................................47
5.11.8 Security Commands. . . . . . . . . . . . . . . . . . . . . ......................47
5.11.9 Restrictions in Security Operation................................47
5.12 Dial Backup . . . . . . . ..............................................48
5.13 Placing a Call . . ..................................................48
5.13.1 Direct Connect with a Standard Telephone ........................48
5.13.2 Direct Connect with an Exclusion-Key Telephone . . . ................49
5.13.3 Autodial from Front Panel. . ....................................49
5.13.4 Autodial with the AT Command Set ..............................49
5.14 Answering a Call. . . . . . . . . . . .......................................49
5.14.1 Autoanswer. . . . . . . . . . . .......................................49
5.14.2 Manual Answer . . . . . . . .......................................49
5.15 Call Termination. . . . . . . . . . . .......................................50
5.15.1 Conditions That Terminate a Call ................................50
5.15.2 V.32 Cleardown . . . . . . . .......................................50
6. Asynchronous Operating Commands . . ....................................51
6.1 General . . . . . . ....................................................51
6.2 Command Categories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.3 Operation Modes . . . . . . . . . . . .......................................51
6.3.1 Offline Command Mode . . . . ....................................51
6.3.2 Online Command Mode . . . . ....................................52
6.3.3 Data Mode . . . . . . .............................................52
6.4 Sending Commands to the Modem . . . . . . ..............................52
6.4.1 Creating a Command Statement ..................................52
6.4.2 Autobaud . . ..................................................53
6.4.3 Guidelines for Creating Command Statements ......................53
6.4.4 Monitor Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
CONTENTS
9
6.4.5 Command-Statement Buffer . . . . . . ...............................53
6.4.6 Backspace Key . . . . . . . . . . . . . . . . . . . . . . . . . . . .....................53
6.4.7 Repeating a Command (A/) . . . . . . ................................54
6.4.8 Numbered Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.4.9 Group Commands .............................................54
6.5 Command Table. ..................................................55
6.6 Response Commands . . . . ...........................................59
6.6.1 How Response Messages Work ...................................59
6.6.2 Selecting Response Form (V). . . . . . ...............................59
6.6.3 Electing to Use Response Messages................................59
6.6.4 Enabled/Disabled Response Displays (Q) ...........................59
6.6.5 Dial Parameter and Connect Speed Displays (X) .....................60
6.6.6 Number Code Application (*RC) .................................61
6.6.7 Response Number Codes/Messages................................62
6.7 Dial Commands . ..................................................63
6.7.1 Dialing (D) . ..................................................63
6.7.2 Tone Dialing (T). . . . ...........................................64
6.7.3 Pulse Dialing (P). . . . ...........................................64
6.7.4 Insert Pause (,) . . . . . . . . . . . . . . . . . . . . . . . . . . . .....................64
6.7.5 Wait for Second Dial Tone (W) ...................................64
6.7.6 Switch Hook (!). . . . . . . . . . . . . . . . . . . . . . . . . . . .....................64
6.7.7 Switching to Answer Mode After Dialing (R) ........................64
6.7.8 Wait for 5 Seconds of Silence (@) .................................64
6.7.9 Remaining in Command Mode (;).................................65
6.7.10 Dialing a Stored Telephone Command Line (S) .....................65
6.7.11 Voice Calls . ..................................................65
6.7.12 Switch from Voice to Data. . . . . . .................................65
6.8 Answering a Call. ..................................................66
6.8.1 Manual Answer . . . . ...........................................66
6.8.2 AT Command Answer (A) . . . . . . .................................66
6.8.3 Autoanswer (S0) . . . . ...........................................66
6.9 Terminal-Interface Commands . . . . . . .................................66
6.9.1 Data Carrier Detect (&C). . . . . . ..................................67
6.9.2 Data Set Ready (&S). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........67
6.9.3 Data Terminal Ready (&D) . . . . . . ................................68
6.9.4 Serial Port Ring Indicate (\R) . . . . . . ..............................68
6.9.5 Request to Send/Clear to Send (&R) ...............................69
6.9.6 DTE Fallback (Pin 23) (*FB) . . . . . . ...............................69
6.10 Test Commands (&T) . . . . ..........................................70
6.10.1 Bilateral Test Enable/Disable (*AN, *DG) ..........................71
6.10.2 DTE-Controlled Remote Digital Loopback (Pin 21) (*RD) ............71
6.10.3 DTE-Controlled Local Analog Loopback (Pin 18) (*LA) ..............71
6.11 General Commands . . . . ...........................................72
6.11.1 Changing from Data Mode to Command Mode (+++) ..............72
6.11.2 Local Character Echo (E). . . . . . .................................72
6.11.3 Hanging Up (H). . . . ..........................................73
6.11.4 V.32 Cleardown (H2, H3) . . . . . . ................................73
6.11.5 EPROM Check (I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........73
6.11.6 Speaker Volume (L) . ..........................................74
6.11.7 Speaker Control (M) ..........................................74
6.11.8 Return Online (O) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........74
6.11.9 Long-Space Disconnect (Y) . . . . . . ...............................75
6.11.10 Guard Tones (&G). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........75
MODEM 325 AND MODEM 325 CARD
10
6.11.11 Dial/Leased Line (&L).........................................76
6.11.12 Asynchronous/Synchronous Mode Selection (&M) ..................76
6.11.13 Make/Break Dial Pulse Ratio (&P) ...............................77
6.11.14 Synchronous Transmit Clock Source (&X) ........................77
6.11.15 DCE Speed (%B) . . . ..........................................77
6.11.16 Disconnect Buffer Delay (%D) ..................................78
6.11.17 Auto Retrain (%E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........79
6.11.18 Product Revision Level (%V) ...................................79
6.11.19 Product Serial Number ($V). . . . . . ..............................79
6.11.20 Permissive/Programmable (%Z) .................................79
6.11.21 Talk/Data (*DA) . . . ..........................................80
6.11.22 Dial Backup (*DB) . . . . . . . . . . . . . . . . . . . . . ......................80
6.11.23 V.32 Fast Train (*FT) .........................................80
6.11.24 Return to Leased Line from Dial Backup (*LB) ....................81
6.11.25 Line Current Disconnect (*LC) .................................81
6.11.26 Manual Dial Backup (*LD). . . . . . ...............................81
6.11.27 Disable AT Command Set (*NT) ................................81
6.11.28 Answer/Originate (*OR) . . . . . . .................................82
6.11.29 Leased-Line Transmit Level (*TLn)..............................82
6.12 Configuration Commands . . . .......................................82
6.12.1 Modem Power-On Configuration (&W) ...........................82
6.12.2 Reset to Stored Configuration (Z) ................................83
6.12.3 Load Factory Options (&F) . . . . . . ...............................84
6.12.4 View Configuration Profiles/Received Signal Parameters (&V) .........84
6.12.5 Storing a Telephone Command Line (&Z) .........................84
6.12.6 Retaining/Restoring Options (*RO) ..............................85
6.13 Remote Configuration . . . ..........................................85
6.13.1 Security Code (%P=) . . . .......................................85
6.13.2 Remote Configuration (%T=) ...................................86
6.14 Protocol Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
6.14.1 Operating Mode (\N) . . . .......................................86
6.14.2 Serial Port (DTE) bps Adjust (\J) .................................87
6.14.3 Data Link Flow Control (\G) . . . . . . ..............................87
6.14.4 Serial-Port Flow Control (\Q). . . . . . ..............................88
6.14.5 XON/XOFF Passthrough (\X) ...................................88
6.14.6 MNP Data Compression (%C) ...................................89
6.14.7 Auto-Reliable Fallback Character (%An) ...........................89
6.14.8 Break Control (\Kn). . . . . . . . . . . . . . . . . . . . . ......................90
6.14.9 Maximum MNP Block Size (\A) ..................................92
6.14.10 MNP Inactivity Timer (\T) . . . . . . ...............................92
6.14.11 Protocol Result Codes (\V) . . . . . . ...............................93
6.14.12 Transmit Break/Set Break Length (\B)............................93
6.14.13 Set Auto-Reliable Buffer (\C) ...................................93
6.14.14 Originate MNP Link (\O) . . ....................................94
6.14.15 Accept an MNP Link (\U) . . ....................................94
6.14.16 Switch from Normal to MNP (\Y)................................94
6.14.17 Switch from MNP to Normal (\Z) ................................95
CONTENTS
11
7. Status Registers . .......................................................96
7.1 How S-Registers Work . . . . ..........................................96
7.2 S-Register Operation . . . . ...........................................97
7.2.1 Individual Bit Command (Sn .(bit#)=v)............................97
7.2.2 Autoanswer (S0=0-255). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.2.3 Ring Count (S1=0-255) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.2.4 Escape Character (S2=0-255) . . . . . . ..............................98
7.2.5 End-of-Line Character (S3=0-127) ................................98
7.2.6 Line-Feed Character (S4=0-127)..................................98
7.2.7 Backspace Character (S5=0-127) .................................98
7.2.8 Pause Before Dialing (S6=0-255) .................................98
7.2.9 Pause for Ringback Detection/Pause for Carrier Detection (S7=1-30) ....98
7.2.10 Pause Interval for Comma (S8=0-255) ............................99
7.2.11 Carrier Detect Time (S9=0-255) .................................99
7.2.12 Lost Carrier Detect Time (S10=0-255) ............................99
7.2.13 DTMF Tone Duration (S11) . . . . . . ...............................99
7.2.14 Escape Sequence Pause Interval (S12=0-255).......................99
7.2.15 S13. . . . . . . . . ................................................99
7.2.16 S14 (Bit-Mapped Options) . . . . . . ................................100
7.2.17 S15. . . . . . . . . ................................................100
7.2.18 System Tests (S16).............................................101
7.2.19 S17. . . . . . . . . ................................................101
7.2.20 Test Timeout (S18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........102
7.2.21 S19, 20. . . . . .................................................102
7.2.22 S21 (Bit-Mapped Options) . . . . . . ................................102
7.2.23 S22 (Bit-Mapped Options) . . . . . . ................................103
7.2.24 S23 (Bit-Mapped Options) . . . . . . ................................103
7.2.25 S24. . . . . . . . . ................................................104
7.2.26 DTR State Recognition Time (S25) ...............................104
7.2.27 RTS/CTS Delay (S26) ..........................................104
7.2.28 S27 (Bit-Mapped Options) . . . . . . ................................104
7.2.29 Loopback Timer (S28) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
7.2.30 S29 (Bit-Mapped Options) . . . . . . ................................105
7.2.31 S30 (Bit-Mapped Options) . . . . . . ................................106
7.2.32 S31. . . . . . . . . ................................................106
7.2.33 S32 (Bit-Mapped Options) . . . . . . ................................107
7.2.34 S33. . . . . . . . . ................................................107
7.2.35 S34 (Bit-Mapped Options) . . . . . . ................................108
7.2.36 S35-38 . . . . . .................................................108
7.2.37 S39 (Bit-Mapped Options) . . . . . . ................................108
7.2.38 S40-51 . . . . . .................................................108
7.2.39 S52 (Bit-Mapped Options) . . . . . . ................................109
7.2.40 801 V.32 Timeout (S53) . . . . . . ..................................109
7.2.41 Flow Control (S54) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........110
7.2.42 S55, 56. . . . . .................................................110
7.2.43 Number Code Application (S57) .................................110
7.2.44 MNP Inactivity Timer (S58) . . . . . . ...............................111
7.2.42 MNP Break Control (S59) . . . . . . ................................111
7.2.46 S60 (Bit-Mapped Options) . . . . . . ................................112
7.2.47 DTE Speed (S61). . . . ..........................................113
7.2.48 Disconnect Buffer Delay (S62) ...................................113
7.2.49 Maximum MNP Block Size (S63) .................................114
7.2.50 Auto-Reliable Fallback Character (S64) ............................114
MODEM 325 AND MODEM 325 CARD
12
7.2.51 S65-66. . ....................................................114
7.2.52 Link Speed Status (S67). . . . ....................................114
7.2.53 S68 . . . . ....................................................114
7.2.54 DCE-Independent Speed (S69)..................................115
7.2.55 Operating Mode (S70) .........................................115
7.2.56 Operating Mode Status (S71) ...................................116
7.2.57 S72 (Bit-Mapped Options). . ....................................116
7.2.58 S73-77. . ....................................................116
7.2.59 Autocallback Timer (S78). . . . . . .................................117
7.2.60 Break Length (S79) . . . . . . . . . . . . . . . . . . . . . ......................117
7.2.61 S80-83. . ....................................................117
7.2.62 S84 (Bit-Mapped Options). . ....................................118
8. V.25 bis Autodialer . . . . . . . ..............................................119
8.1 General . . . . . . ....................................................119
Autodialer Command Strings and Parameters ............................119
8.2 Guidelines . . . . ....................................................119
Explanations of Invalid Responses . . . . . . ...............................120
8.3 Dial Parameters . . . . . . .............................................121
8.4 V.25 bis Command and Response Definitions ............................122
8.4.1 Dial Command (CRN
nn...n) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
122
8.4.2 Program Number Command (PRN
a;nn...n) . . . . . . . . . . . . . . . . . . . . . . . .
123
8.4.3 Intermediate Call Progress Responses .............................123
8.4.4 Dial Stored Number (CRS
a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
123
8.4.5 Request List of Stored Numbers (RLN) ............................123
8.4.6 Disregard Incoming Call (DIC)...................................124
8.4.7 Connect Incoming Call (CIC) . . . . . . ..............................124
8.4.8 Redial Last Number (CRR
n). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
124
8.4.9 Link Number by Address (PRL
a;b). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
125
8.4.10 Request List of Linked Numbers (RLL) ............................126
8.4.11 Request List of Version (RLV). . . . . . ..............................126
8.5 Modem Options Command (PRO
xxx;yy;
0;0) ............................127
8.5.1 Save Current Settings (PRK) . . . . . . ...............................128
8.5.2 Restore Factory Settings (PRP
n) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
128
8.5.3 Request List of Stored Options (RLO
xxx;yy). . . . . . . . . . . . . . . . . . . . . . . . .
129
8.6 Options . . . . . . ....................................................130
Rate Select . . . . ....................................................134
9. Protocols . . . . . . . . . . . . . ................................................135
9.1 MNP/Reliable Mode . . . . ............................................135
9.2 Auto-Reliable. . ....................................................135
9.3 Constant-Speed Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .........135
9.4 Data Compression . . . . . . . ..........................................135
9.5 Normal Mode . . . . . . . ..............................................135
9.6 Direct Mode . . ....................................................135
9.7 Flow Control . . ....................................................135
10. Maintenance . . . . . . . . . . . . .............................................136
10.1 Replacing the Fuse . . . . ............................................136
10.2 Cleaning . . . . ....................................................136
10.3 Preparing for Tests . . . . ............................................136
Appendix A: Phone Jack Descriptions . . . . ....................................137
A.1 Dial-Line Pin Functions . . . ..........................................137
A.2 Telset/Leased-Line Pin Functions . . . . . . ...............................137
CONTENTS
13
Appendix B: Troubleshooting . . . . ..........................................138
B.1 Telephone Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . .....................138
B.2 Standard Phone . ..................................................138
B.3 Exclusion-Key Telephone . ..........................................138
B.4 Fallback Rates. . . . . . . . . . . ..........................................138
B.5 Modem and Telephone Line Check ...................................139
Appendix C: Command Index and Defaults ...................................142
C.1 General. . . .......................................................142
C.2 Status Registers . ..................................................149
C.3 V.25 bis Dialer Commands. ..........................................151
C.4 Factory Option Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . .....................153
Appendix D: Abbreviations and Acronyms . . . . . . ..............................158
Appendix E: ASCII and EBCDIC Character Table..............................166
MODEM 325 AND MODEM 325 CARD
14
1. Specifications
Modem Data Rates
—9600 trellis coded, 9600 and 4800 uncoded as stated in CCITT recommendation
V.32, 2400 and 1200 compatible with CCITT recommendation V.22 bis, 300 as stated in Bell specification
103
Modulation
—9600, 4800, 2400 QAM with suppressed carrier (V.32, V.22 bis compliant), 1200 PSK,
300 FSK
Transmit Carrier Frequencies
—V.32 bis 1800 Hz
Originate Answer
1200 and 2400 1200 Hz ± 0.01% 2400 Hx ± 0.01%
300 bps
Mark: 1270 Hz ± 0.5% 2225 Hz ± 0.5%
Space: 1070 Hz ± 0.5% 2025 Hz ± 0.5%
Internal Transmit Clock Frequency
—Selected bit rate ±0.01%
External Transmit Clock Frequency
—Selected bit rate ±0.01%
Transmit Output Level
—0 to -15 dBm, selectable; PSTN operation is programmable or permissive
Operation
—4-wire, full-duplex, leased (private) line; 2-wire, full-duplex, leased (private) line or PSTN
Carrier Detect Level
—Dynamic to -43 dBm
Telco Connection
—Two 8-pin modular jacks, dial and private lines
Testing
—511 PN pattern (per V.52), V.54 remote loopback control
Telephone Line
—Balanced 600-ohm type 3002 or equivalent, 16 dB nominal loss, frequency translation
up to ±10 Hz
Digital Interface
—Conforms to EIA-232D and CCITT V.24
Line Equalization
—Automatic adaptive
RTS/CTS Delay
—From 0 ±2 ms to 90 ±2 ms, user-selectable in 10-ms increments (the default is 0 ms)
Temperature—Operating:
32 to 122 °F (0 to 50 °C);
Storage:
-40 to 158 °F (-40 to 70 °C)
Humidity
—0 to 95% relative humidity, noncondensing
Power
—115 VAC ±10%, 60 Hz, 230 VAC ±10%, 50 Hz, or 12 to 60 VDC
Power Consumption
—9 watts
Fuse
—1/4 Amp slow-blow (115-VAC model)
Size
—2.25"H x 7"W x 10.5"D (5.72 x 17.78 x 26.67 cm)
Weight
—2 lb. 13 oz. (1.28 kg)
CHAPTER 2: Introduction
15
2. Introduction
2.1 General
The Modem 325 and Modem 325 Card are versatile, secure, and reliable modems that can operate full
duplex on both dial-up and leased lines. The modems are compatible with all required standards and
recommendations and offer a wide variety of automatic, remote, and backup capabilities. The most
notable characteristics are MNP
®
error-control protocols through Level 5 data compression. Other
special features include a V.25 bis autodialer, secure operation, and trellis coding for improved signal-to-
noise performance.
The modem operates at data rates of
• 9600 bits per second trellis-coded, as stated in CCITT recommendation V.32
• 9600 and 4800 bps uncoded, as stated in CCITT recommendation V.32
• 2400 and 1200 bps compatible with CCITT recommendation V.22 bis
• 300 bps as stated in Bell specification 103*
Note: 4-wire leased-line mode supports 4800 and 9600 bps only.
2.2 Description
2.2.1 FUNCTIONAL
The Modem 325 processes asynchronous serial data at 19200, 9600, 4800, 2400, 1200, or 300 bps, or
synchronous data at 9600, 4800, 2400, or 1200 bps, for transmission over the dial-up telephone network
and 2- or 4-wire dedicated leased lines. In 9600-bps trellis mode, near- and far-end echo canceling
combine with 8-state, 2-dimensional trellis coded modulation to maximize modem performance, even on
lines of reduced quality.
Integral test features allow the operator to determine system performance and isolate faults in the
communications link.
You can configure the modem from the front panel, or with AT or V.25 commands. Changes between
different modes of operation can be made easily and rapidly.
A security scheme prevents unauthorized access by a remote modem.
The V.25 bis autodialer broadens compatibility with host equipment.
2.2.2 P
HYSICAL
The modem is a standalone desktop unit. Operating options are stored in nonvolatile memory. A menu-
driven, 32-character LCD provides the operator with command feedback as well as real-time displays of
unit operation. Modem and DTE operation can be monitored by six LEDs and the display status screen
on the front panel.
Figure 2-1
shows the LCD front panel.
The rear panel (
Figure 2-2
) has an EIA-232 connector for DTE interface, an 8-pin TELSET/LEASED
LINE connector, an 8-pin DIAL connector, and the power switch. The fuse and power cord are also on
the rear panel.
Inside the modem are two printed circuit boards and the AC line transformer. Hardware straps on the
main board offer additional options.
Note: If you ordered the MD278A-R2, you should have received cables with it.
MODEM 325 AND MODEM 325 CARD
16
Figure 2-1. Front Panel.
Figure 2-2. Rear Panel.
QM
YES
TALKDATA
NO
TD
RD
CD
RS
CS
Modem 325
TELSET/
LEASED LINE
DIAL
DTE
FUSE
1/4 AMP
115 VAC
1/4 AMP 60 HZ
ON
OFF
CHAPTER 2: Introduction
17
2.3 How to Use This Manual
2.3.1 SPECIFICATIONS
Modem specifications are listed in
Chapter 1
.
2.3.2 O
PTION SELECTION
Four methods of selecting or changing modem options are available. You need to read only the part of
the manual that deals with the method you’ve chosen.
• LCD—Using the front-panel LCD and pushbuttons for changing modem options is simple and
straightforward, and requires the least amount of technical background. See
Chapter 4
.
• Software program—A wide variety of communication software programs is available, or advanced
computer users can write their own software programs that will interact with the modem memory to
select options. If you’re using software to configure your modem, follow the software’s instructions.
• AT Commands—The AT compatible command set can be used to select modem options. See
Chapters 6
and7.
• V.25 bis Commands—A set of V.25 bis commands allows selection of modem options during
synchronous operation. See
Chapter 8
.
NOTE
You can select options from the LCD without the DTE or phone line connected.
2.3.3 Q
UICK STARTUP
A quick startup procedure at the beginning of
Chapter 5
provides information for quickly getting online.
MODEM 325 AND MODEM 325 CARD
18
3. Installation
3.1 General
This chapter provides information for the mechanical and electrical installation of the modem.
3.2 Site Selection
Install the modem within 6 feet of a 115- or 230-VAC grounded outlet as required for the specific model
and no farther than 50 feet from the terminal equipment.
The installation area should be clean and free from extremes of temperature, humidity, appreciable
shock, and vibration. Refer to
Chapter 1
for details. Allow clearance for operation and maintenance
access and at least 4 inches at the rear for cables and air flow.
3.2.1 T
OOLS REQUIRED
Normal installation requires a screwdriver to secure the DTE cable to the modem and to attach the telco
cable to the phone jack for leased-line operation.
3.2.2 RECEIPT INSPECTION
After unpacking the equipment, check the contents against the packing list. Inspect the equipment for
any damage that may have occurred in shipment. If you note any damage or are missing equipment, call
your supplier. Keep the shipping container and material for future shipment.
3.3 Electrical Installation
The rear panel (
Figure 3-1
) houses the power cord and connectors for the DTE and telephone lines.
Figure 3-1. Rear Panel I/O.
AUX
LINE
DTE
3/16
FUSE
AMP S.B. POWER
115 VAC
60 HZ 14W
ON
OFF
CHAPTER 3: Installation
19
AC POWER CONNECTION
Power is supplied through a 6-foot line cord with a grounded 3-wire plug. If chassis ground is available
through the third prong of the plug, a separate ground wire is not required.
CAUTION
To protect the DC-to-DC converter from reverse-polarity damage, make sure that the
positive and negative leads are properly connected.
The modem can be ordered for DC power input. Connect 12 to 60 VDC power to the terminal block
attached to the modem back panel. A chassis ground connection is also supplied on the terminal block.
3.4 DTE Connection
The DTE connector is a 25-pin D-series type conforming to EIA-232 specifications. The digital interface
signals are illustrated in
Figure 3-2
and described in
Table 3-1
.
MODEM 325 AND MODEM 325 CARD
20
Figure 3-2. Digital Interface Signals.
MODEM MODEM
TRANSMIT DATA (BA)
EXT TX CLOCK (DA)
TX CLOCK (DB)
REQUEST TO SEND (CB)
CLEAR TO SEND (CB)
DATA SET READY (CC)
DATA TERMINAL READY (CD)
RECEIVE DATA (BB)
RECEIVE CLOCK (DD)
CARRIER DETECT (CF)
RING INDICATOR (CE)
TRANSMITTER RECEIVER
TRANSMISSION
FACILITY
DIRECT
CONNECT
CIRCUITRY
RECEIVER TRANSMITTER
DIRECT
CONNECT
CIRCUITRY
DATA TERMINAL READY (CD)
RECEIVE DATA (BB)
RECEIVE CLOCK (DD)
CARRIER DETECT (CF)
RING INDICATOR (CE)
DTEDTE
TRANSMIT DATA (BA)
EXT TX CLOCK (DA)
TX CLOCK (DB)
REQUEST TO SEND (CA)
CLEAR TO SEND (CB)
DATA SET READY (CC)
CHAPTER 3: Installation
21
Table 3-1. Digital Interface Signal Descriptions.
Pin EIA-232D CCITT Signal Name Description
No. V.24
1 101 Shield No connection
2 BA 103 Transmitted Data Serial digital data (to be modulated) from a
data terminal or other digital data source:
Synchronous data must be accompanied by
the modem transmit clock (pin 15) or by an
external data rate clock (pin 24). Data
transitions should occur on positive-going
clock transitions; asynchronous data does
not require a transmit clock.
3 BB 104 Received Data Serial digital data output to the DTE
interface: Sync data is accompanied by an
internal data rate (receive) clock (pin 17) that
has positive-going transitions on the data
transition. Async data does not require a
receive clock.
4 CA 105 Request to Send A positive level to the modem when data
transmission is desired.
5 CB 106 Clear to Send A positive level from the modem in response
to request to send and when the modem is
ready to transmit.*
6 CC 107 Data Set Ready A positive level from the modem when
power is on and ready to operate: In dialup
operation, the modem must be off hook to
give a high DSR signal.*
7 AB 102 Signal Ground or Common signal and DC power ground.
Common Return
8 CF 109 Received Line A positive level from the modem
Signal Detector indicating the presence of a received signal
(carrier detect).*
9 +12 Volts +12 voltage reference
10 -12 Volts -12 voltage reference
*Modem options may force these signals on or cause them to be ignored.
MODEM 325 AND MODEM 325 CARD
22
Table 3-1 (continued). Digital Interface Signal Descriptions.
Pin EIA-232D CCITT Signal Name Description
No. V.24
11 Signal Quality Indicator This circuit indicates probability of errors in
the received data. A positive level indicates
poor signal quality; a negative level
indicates good signal quality.‡
15 DB 114 Transmit Clock (DCE) A transmit-data-rate clock output for use by
an external data source: Positive clock
transitions correspond to data transitions.
17 DD 115 Receive Clock A receive-data-rate clock output for use by
an external data sink: Positive clock
transitions correspond to data transitions.
18 141 Local Loopback A positive level causes the modem to enter
(Loop 3) Control the local analog loopback test mode.
20 CD 108.2 Data Terminal Ready This circuit is positive when the DTE is ready
to originate or answer a call in dialup
operation. DTE must always be active (high)
in 2-wire private line operation. Cycling DTR
causes retraining.*
21 140 Remote Digital A positive level causes a digital loopback test
Loopback mode at the remote modem.
22 CE 125 Ring Indicator In direct-dial operation, this circuit is positive
in response to an incoming ring signal.
23 CH 111 Data Rate Select Supplies a data rate control input to select
primary or fallback data rate: Negative
voltage selects primary data rate and
positive voltage selects fallback data rate.
24 DA 113 External Transmit A serial data rate clock input from the data
Clock source. Positive clock transitions correspond
to data transitions.
25 142 Test Mode Indicates the modem is in a test mode.
*Modem options may force these signals on or cause them to be ignored.
‡This function can be disabled or its logic sense reversed by hardware straps. Refer to Strap Options.
CHAPTER 3: Installation
23
3.5 Telephone Cables
The cables used for connection between the modem and the various telco jacks are shown in
Figure 3-3
.
The part number is printed on the cable.
Part Number Modem Connection Mechanical Layout Telco Connection Telco Jack
Figure 3-3. Telephone Cables.
8-PIN
Included
EL08MS-0006
Included
EL08MS-0006
6-PIN
RJ-11
Permissive
Pins 4 and 5
connected
Pins 3 and 4
connected
6 Feet
2-Wire Cable
6 Feet
6 Feet
6 Feet
8-PIN
8-PIN
Pins 3-8
connected
Pins 3-8
connected
RJ-48S
Programmed
RJ41S
(Prog Only)
Leased Line
Cable
For use with
42A Block
4-Spade
Lug
8-Pin
Pins 1, 2, 7, 8
connected
Pins 1, 2, 7, 8
connected
Pins 1, 2, 7, 8
connected
6-Wire Cable
4-Wire Cable
4-Wire Cable
8-Pin
8-Pin
Leased Line
Cable for use
with JM8 Jack
MODEM 325 AND MODEM 325 CARD
24
3.6 Telephone Line Connection
The modem operates in one of three modes:
• Permissive (PSTN)
• Programmable (PSTN)
• Private line
Permissive and programmable modes are used on the dial-up Public Switched Telephone Network
(PSTN). Private-line mode is used on 4-wire or 2-wire dedicated leased lines. The user must decide
which mode to use and then select the telephone jacks accordingly.
3.6.1 PSTN C
ONNECTION
This modem is registered by the Federal Communications Commission (FCC) for direct connection to the
PSTN. The label on the chassis bottom gives the FCC registration number and other information.
Direct connection to the PSTN provides two modes of operation (
Figure 3-4
).
• Permissive
• Programmable
3.6.2 P
ERMISSIVE
In permissive mode, the modem transmits a maximum signal level of -9 dBm. Signal loss between the
modem and telephone company central office is not controlled. Jack arrangements for this mode are the
RJ-11C for standard telephones and the RJ-16X for exclusion key telephones. This cable (included) is
used to connect the DIAL jack on the back of the modem to the RJ-11C or RJ-16X wall jack.
3.6.3 P
ROGRAMMABLE
Programmable mode corrects for the signal-level loss between the modem and the telephone company’s
central office. This is done by setting the modem’s transmit-output signal level with a fixed-value
programming resistor selected and installed in the jack by the telephone company. This allows the
output signal to reach the central office at the optimum level of -12 dBm. Jack arrangements for this
RJ-45S and RJ-41S jacks are used for this mode. RJ-41S has a switch option that must be selected to
Programmed (P). Cable EL08MS-0006 is used to connect the DIAL jack on the back of the modem to the
RJ-41S or RJ-45S wall jack.
CHAPTER 3: Installation
25
Figure 3-4. Permissive or Programmable Connection.
Telset/Leased Line
8-pin connector
Dial 8-Pin
Connector
DTE Connector
Screws
Cable
Supplied
with
Telephone
RJ-11C, RJ-45S,
or RJ-41S jack
installed by
telephone
company
Use the included cable
with the RJ-11 jack, or
EL08MS-0006.
DTE cable
EIA-232 25-Pin
Connector to
DTE
TELSET/
LEASED LINE
DIAL
DTE
FUSE
MODEM 325 AND MODEM 325 CARD
26
NOTE
The modem is compatible with exclusion key phone arrangements.
3.6.4 LEASED-LINE CONNECTION
Leased lines use either a 2-wire or 4-wire connection. The telephone company will install the leased line
and wall jack at your site. The line connects to the modem at the 8-position TELSET/LEASED LINE
jack.
The 42A block is most common for leased-line use. It requires the use of the 8-pin-modular-to-spade-
lug cable (included).
Figure 3-5
illustrates the typical hook-up of the modem for operation over private
leased lines with dial backup.
NOTE
Some Bell operating companies have discontinued the 42A block for leased-line
terminations. Instead, the modular jack JM8 is used. If this is the case in your area, you
need a special cable (EL08MS-0006). Contact technical support for further information.
CHAPTER 3: Installation
27
Figure 3-5. Leased-Line Connection.
Telset/
Leased Line
Dial Line (may be
used for dial
backup)
Included cable (must
use for leased-line
connection)
EIA-232 25-pin
connector to DTE
RJ-11C,
RJ-45S, or
RJ-41S
Use the included cable with the RJ-11
jack, or EL08MS-0006.
42A
block
TELSET/
LEASED LINE
DIAL
DTE
FUSE
To
Central
Office
42A block
Red
Green
Black
Yellow
Screw Terminal
Spade
lug
Ring (R)
Tip (T)
Tip (T1)
Ring (R1)
Pin#
1
2
7
8
TX pair
4-wire or
TX and RX
2-wire
RX pair
4-wire
To
modem
MODEM 325 AND MODEM 325 CARD
28
4. Option Selection
4.1 General
NOTE
This chapter contains the options available by pushbutton in response to the LCD.
There are four factory option sets to choose from. The modem is shipped configured to factory option
set #1 (see Appendix D). Because of the number of possible applications, most modems require some
option changes to fit into the network.
A user programmed option set is available for storing a custom configuration.
4.2 Strap Option Selection
Modem configuration is determined by front panel controls, AT commands,and hardware option straps
located on the pc board. Remove the modem cover for access to the option straps.
NOTE
Normally, PC board straps will not have to be changed.
REMOVING
COVER
WARNING
Disconnect AC power before removing the cover. Although dangerous voltage levels are
not exposed, disconnecting power eliminates the hazard of electrical shock.
Place the unit on its side on a flat surface. Insert a medium-size flat screwdriver blade in one of the
bottom rear latch slots. DO NOT PUSH the screwdriver but lightly pry the handle away from the unit as
illustrated in
Figure 4-1
. This will disengage the lock prong from the lock clip. Assist removal by
pushing the cover from the chassis with your fingers on the rear edges of the unit. Repeat this procedure
with the remaining three latch slots.
To replace the cover, align the lock clips, rear guide grooves, and front lock tabs. Press the cover in
place until the lock clips engage the lock prongs.
Figure 4-2
shows typical strap configurations and
Figure 4-3
shows strap locations.
CHAPTER 4: Option Selection
29
Figure 4-1. Removing the Cover.
Figure 4-2. Option Strap Configuration.
Chassis Bottom
Lock Prong
Lock Clip
Cover
=
12
12
MODEM 325 AND MODEM 325 CARD
30
Figure 4-3. Strap Locations.
Speaker
Factory use only Do not change
Factory use only Do not change
NORM
Tip and Ring
NORM/REV
REV
Ground Option
SIG GND CH GND
QM Disable
Option
DIS
EN
CHAPTER 4: Option Selection
31
4.3 Hardware Straps
4.3.1 TIP AND
RING POLARITY
Some telephones are sensitive to tip and ring polarity. If a dial tone is detected after dialing, reverse
these two straps.
Figure 4-4. Tip and Ring Polarity Jumper.
4.3.2 G
ROUND OPTION STRAP
Signal ground is normally connected to chassis ground. If interference exists, isolate signal ground from
chassis ground.
Figure 4-5. Ground Option Strap.
Normal tip and
ring connection
Reverse tip
and ring
connection
Signal ground connected to
chassis ground selected
NORM
REV
NORM
REV
CH GNDSIG GND
MODEM 325 AND MODEM 325 CARD
32
4.3.3 QM DISABLE OPTION
When enabled, the Quality Monitor (QM) output is connected to the EIA-232 (pin 11) interface. Disabled
disconnects the QM output. Refer to
Chapter 5
and
Table 3-1
for more QM information.
Figure 4-6. QM Disable Option Jumper.
4.4 LCD Option Selection
The modem options can be observed or changed through the front-panel LCD. The LCD also gives
modem status.
4.5 Main Menu
There are six main menus that support modem operations:
• MODEM STATE
• DIAL STORED NUMBER
• DISPLAY STATUS
• SELECT TEST
• MODIFY CONFIGURATION
• CHANGE PHONE NUMBERS
Each main menu is supported by various submenus, items, and options (
Table 4-1
). The two right
columns in the table show the associated AT commands and S-registers as a cross reference.
M
ENU SEQUENCE
Main menus consist of six displays which allow access to submenus. Each submenu has a submenu item
column; if an option setting is selected or if all options have been scrolled through, the menu will return
to the submenu header.
If the NO pushbutton is pressed and held, the modem automatically scrolls through the menu.
QM output not connected to
EIA-232 interface
DISEN
CHAPTER 4: Option Selection
33
NOTE
Main Menu 1 does not scroll. The displays in Main Menu 1 show the current operating
mode or status. These displays are the results of other selected options and are not
themselves option selections.
While operating in the option menu, pressing NO scrolls vertically down the columns in
Table 4-1 and pressing YES advances horizontally across the columns.
Table 4-1. Menu Options.
Main Menu LCD Messages
M V.32 9600 IDLE (Press NO to advance to MAIN 2)
A V.32 9600 TALK
I V.32 9600 TRAINING
N V.32 9600 ONLINE
1 V.32 9600 RINGING
V.32 9600 IN TEST
MAIN MENU SUBMENU SUBMENU ITEM AT S-REG
ITEM OPTION COM.
M DIAL STORED DIAL #1-9 YES, NO DSn (n=1-9) —
A NUMBER ?
I
N
2
M DISPLAY DTE SIGNALS DTR ON/OFF DISPLAYS — —
A STATUS ? DSR ON/OFF STATUS
I (status only) OH ON/OFF
N RI ON/OFF
3
MNP LEVEL NEGOTIATING DISPLAYS — —
MNP LEVEL STATUS
MNP LEVEL 2,
3, 4, OR 5
CONNECTION
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