User`s guide

A-18 Preliminary November 23, 1998 MultiVoice Gateway for the MAX— User’s Guide
Troubleshooting
Common problems and their solutions
Change the value to the other available option and check to see whether the Red Alarm
condition goes away within 30 seconds.
2 If the Red Alarm state persists, check the cabling.
You might have a crossover cable installed when a straight-through cable is required, or
vice versa. If the MultiVoice Gateway is connected through bantam plugs, reverse the
transmit and receive plugs. Then allow the MultiVoice Gateway to attempt to establish
synchronization for an additional 30 seconds.
3 You can eliminate the cabling as a possible cause by replacing the connection with a
loopback plug. The LS LED should go off immediately, followed by the RA LED in about
30 seconds.
A PRI line is in use and the Alarm LED blinks
A blinking ALARM LED means that the physical configuration of the E1 or T1 line is correct
but the D channel is not communicating with the WAN. To resolve this problem:
1 Verify with your carrier representative that the D channel is channel 16 (E1) or 24 (T1).
2 If the D channel number is correct, check the value of the Line Encoding parameter in the
Line profile. When B8ZS encoding is in use, a noninverted D channel is established. If
AMI encoding is selected, an inverted D channel is established. Check the line translations
provided by your carrier representative and set the line encoding to match the inversion
requirements.
3 Determine whether your WAN interface or the MultiVoice Gateway T1 unit is equipped
with a CSU.
If the WAN interface or the MultiVoice Gateway is not equipped with a CSU, the ALARM
LED blinks. Verify that you have specified the proper Length or Buildout value in the Line
profile.
4 Verify that the D channel is in service.
If no equipment has been plugged into the line for a short period of time (five to ten
minutes), the D channel is taken out of service. You might need to ask your carrier to put
the D channel back into service.