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- TROUBLESHOOTING
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Troubleshooting
C-33821-A2-GB20-40 January 1999
Table C-5
(1 of 2)
Modem – VF Connection
Symptom
Action
Modem does not receive a
dial tone
Check the VF line connection. Verify dial tone at the source.
Modem does not go
off-hook and answer an
incoming call
Verify that the Auto-Answer Ring Count configuration option (S-register 0) is set to a value
other than 0 (disable).
incoming call
Verify that the DTE is providing DTR to the modem.
If the DTE does not provide DTR to the modem, verify that the modem’s &D command
(DTR Action configuration option) is set for Ignore (&D0).
Verify all cabling.
Modem goes off-hook,
answers, but does not
connect
Perform a Local Analog Loopback test and verify that data entered at the DTE is echoed
back to the DTE.
connect
Verify that the originating modem is compatible.
Verify that originating modem recognizes your modem’s answer tone.
Modem goes off-hook,
answers, but does not
connect (continued)
Verify that originating modem supports your modem’s modulation schemes. The 3821
Plus
modem recognizes V.34, V.32
terbo,
V.32bis, V.32, V.22bis, V.22, V.21, Bell 212A, and
Bell 103J. It does not support other vendors’ proprietary modulation schemes.
Use the S41 register to force your modem to operate at the same modulation scheme as
the originating modem.
Originate Mode Verify that the modem’s DTE Dialer configuration option is set to the correct setting.
Modem does not go
off-hook and begin dialing
If using AT Dialing, refer to the Table C-4, Modem – DTE Connection.
off-hook and begin dialing
If using DTR Dialing, verify the telephone number stored in directory location 1, and verify
that the DTE is raising DTR from Off to ON to initiate a dial.
If using V.25bis Async, verify that the correct character format is set to 7 data bits with even
parity and 1 stop bit, and the carriage return and line feed are used as command
terminators.
If using V.25bis bisync, verify that the correct character format uses two synchronous
control characters and a start-of-text control character before the text block and an
end-of-text control character after the text block.
If using V.25bis HDLC, verify that the correct character format uses flag, address, and
control characters before the text block and a frame sequence check and flag after the text
block.
Modem dials but does not
connect
If the modem is operating behind a PBX, determine if a 9 and comma are needed before
the telephone number.
Determine whether Tone or Pulse dialing is needed.
Verify if one modem is configured for Error Control or Disconnect and the other modem is
configured for no Error Control. Try calling in Buffer mode.
If both modems use V.34, V.32bis, or V.32 modulation, set the modem’s Train Time
configuration option to Long.
- COMSPHERE 1
- Important Safety Instructions 3
- United States 5
- United Kingdom 6
- Ringer Equivalence Number 6
- Connection to Leased Lines 6
- All European Countries 7
- Safety Notice 7
- Restrictions 7
- Table of Contents 9
- COMSPHERE 3821Plus Modem 10
- Table of Contents 11
- Objectives and Reader 13
- Assumptions 13
- How to Use This Manual 13
- Related Documents 14
- Introduction 15
- Status Indicators 16
- Table 1-1 17
- Color Indicates 17
- SDCP Operation 18
- Modem Installation 19
- 495-14797 22
- Front Panel 22
- 495-14800 22
- 496-14801-01 23
- 495-14829 24
- SDCP Menus 27
- Menu Structure 28
- Modem Status Messages 29
- SDCP Menus 31
- Modem Select Branch 33
- Quick Configuration Display 33
- Call Setup Branch 35
- Change Directory 36
- Entering Telephone Numbers 36
- Status Branch 37
- Identity 38
- 494-14855 39
- Local Digital Loop 40
- Remote Digital Loop 40
- Configure Branch 41
- Configure 42
- DTE Interface 44
- Table 3-4 45
- (1 of 6) 45
- (2 of 6) 46
- (3 of 6) 47
- (4 of 6) 48
- (5 of 6) 49
- (6 of 6) 50
- DTE Dialer 51
- Table 3-5 52
- Line Dialer 56
- Table 3-6 57
- (2 of 4) 57
- (3 of 4) 58
- (4 of 4) 59
- Dial Line 60
- Table 3-7 61
- Leased Line 63
- Table 3-8 64
- V.42/MNP/Buffer 65
- Table 3-9 66
- Table 3-11 72
- Control Branch 73
- Clone To Remote 74
- To Local via DTE 74
- Remote Branch 75
- This page intentionally left 76
- AT Commands and S-Registers 77
- Command Guidelines 78
- AT Command List 78
- ATDT9,5551234 79
- Table 4-1 80
- (2 of 13) 80
- AT Commands 80
- (3 of 13) 81
- (4 of 13) 82
- (5 of 13) 83
- (6 of 13) 84
- D D 85
- (9 of 13) 87
- (10 of 13) 88
- (11 of 13) 89
- (12 of 13) 90
- (13 of 13) 91
- S-Register List 92
- (2 of 10) 93
- (3 of 10) 94
- (4 of 10) 95
- (5 of 10) 96
- (6 of 10) 97
- (7 of 10) 98
- (8 of 10) 99
- Table 4-2 100
- (9 of 10) 100
- S-Registers 100
- (10 of 10) 101
- Recovering AT Commands 102
- Initialization Strings 103
- Fax Operation 105
- Remote Access 107
- 495-13082a-02 108
- Security 109
- Originate Security 110
- Answer Security 110
- Callback Security 111
- Security Branch 111
- EditPassWdTable 112
- Select Index 112
- Table 7-1 113
- (2 of 2) 113
- Set Answer Sec 114
- Set Orig Secur 115
- Set CallBack Sec 115
- " Procedure 116
- Security Configuration 117
- Table 7-5 118
- (2 of 3) 118
- (3 of 3) 119
- SDCP Menu Tree 121
- 98-14848-01 122
- 98-14849-01 123
- 495-14850 124
- Result Codes 125
- Table B-1 126
- Troubleshooting 129
- Table C-5 131
- (1 of 2) 131
- Modem – VF Connection 131
- Automatic Firmware 133
- Download 133
- Technical Specifications 135
- Table D-1 136
- Model 3821 136
- Technical Specifications 136
- Specifications Description 136
- Pin Assignments 137
- JM8 to RJ11 Crossover Cable 138
- NIM Cable Pin Assignments 139
- Overview 141
- Call Request Commands 142
- Call Response 142
- Call Connecting (CNX) 143
- Incoming Call (INC) 143
- Disregard Incoming Call (DIC) 143
- Connect Incoming Call (CIC) 143
- Command Response 144
- Equipment List 147
- Configuration Options by 149
- Country Code 149
- Table H-1 150
- (1 of 5) 150
- (2 of 5) 151
- (3 of 5) 152
- (4 of 5) 153
- (5 of 5) 154
- Table H-2 155
- Glossary 161
- Glossary 163
- 00282600 175
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