
COMSPHERE 3800 Series Modems ± Model 3830
| Table | |
| (3 of 4) | |
Modem ± VF Connection | ||
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Symptom | Action | |
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Modem does not go | If using V.25bis HDLC, verify that the correct | |
character format uses flag, address, and | ||
dialing (continued) | control characters before the text block and a | |
| frame sequence check and flag after the text | |
| block. | |
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Modem dials but does | If the modem is operating behind a PBX, verify | |
not connect | if a 9 and comma are needed before the | |
| telephone number. | |
| Verify 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.32bis or V.32 | |
| modulation, set the modem's V.32bis Train | |
| configuration option to Long. | |
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Intermittent disconnects, | Use the &T7 command to perform a remote | |
high error rates, or | digital loopback test with pattern test. | |
excessive |
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retransmissions |
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Modem establishes and | You may have a poor VF connection. | |
disconnects a call | Disconnect and dial again. | |
| The remote modem may have encountered an |
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| EC Disconnect, where the modem is |
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| configured to establish a call using error |
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| correction. |
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| If the modems cannot negotiate EC, then a |
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| disconnect occurs. |
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August 1998 |