User`s guide

A-14 Preliminary November 23, 1998 MultiVoice Gateway for the MAX— User’s Guide
Troubleshooting
Common problems and their solutions
2 Check the flow control settings on your VT100 terminal.
If you are not communicating at all with the MultiVoice Gateway, see whether you can
establish communication after you have turned off all transmit and receive flow control at
your terminal or terminal emulator.
3 Determine whether you need a null-modem cable converter.
In general, it is not required for communications to the MultiVoice Gateway. However, so
many different cable and terminal configurations are available that in some cases a
null-modem cable converter might be required.
Random characters appear in the VT100 interface
If random or illegible characters appear on your display, you probably have a communications
settings problem, specify the following settings:
• 9600 bps data rate
• 8 data bits
•1 stop bit
• No flow control
• No parity
If you have changed the data rate through the Port profile, make certain that your VT100
terminal matches that rate.
A Power-On Self Test fails
If the start-up display indicates a failure in any of its tests, an internal hardware failure has
occurred with the unit. In this case, contact Ascend Customer Support.
ISDN PRI and BRI interface problems
Problems sometimes encountered with ISDN PRI and BRI interfaces include calls not dialed
or answered reliably, Net/BRI lines not dialing or answering calls, apparent logical-link
failures, and WAN calling errors in outbound Net/BRI calls.
Calls are not dialed or answered reliably
If calls are not dialed or answered reliably:
1 Check your cabling.
The first and most critical aspect of the interface is the physical cable connecting the
MultiVoice Gateway to the line or terminating equipment. Typically, WAN interface
cabling problems appear immediately after installation. If you are unsure about the cabling
required, contact Ascend Customer Support. MAX Getting Started describes the general
PRI and BRI interface requirements and lists cabling pin-outs.
2 If the cabling is not the problem and the MultiVoice Gateway is a T1 unit, ensure that the
value of the Buildout parameter or the Length parameter in the Line profile matches the
actual distance in your configuration.
The MultiVoice Gateway displays the Buildout parameter if its interface to the T1 line is
equipped with an internal CSU. Its enumerated values can be 0 dB, 7.5 dB, 15 dB, and
22.5 dB. Contact your carrier representative to determine which value to choose.