Lucent Technologies PortMaster - Manual (Page 294)

Troubleshooting a Leased Line Connection
19-8 PortMaster Configuration Guide
Troubleshooting a Leased Line Connection
Use the information in this section to debug your configuration.
If you have trouble with a leased line connection, verify the following:
• Enter the following commands to view the PPP negotiation on port S1, if this is the
port you are using:
Command> set console s1
Command> set debug 0x51
Command> reset s1
For information about the interpreting the results of the debug command, refer to
the PortMaster Troubleshooting Guide.
After you verify that the PPP negotiation is correct, enter the following commands
to turn off the debug utility:
Command> set debug off
Command> reset console
• The error counters should be 0 (zero) except for abort errors. If your counters are
nonzero, the problem is external to the PortMaster.
Note – CRC errors will occur if the cable is ever unplugged from the PortMaster.
• Verify that you are using the correct cable and that it is attached securely to the
correct port. Not all WAN ports are capable of the same speeds.
• Verify that the DIP switch next to the synchronous port is set to V.35 for Lucent
cables and that you are plugged into the correct V.35 interface on your CSU/DSU.
• Verify that the CSU/DSU is providing the clock to the PortMaster. The CSU/DSU can
generate the clock or receive it from the carrier.
• Verify that the CSU/DSU is configured properly.
• If you have a Cisco router on the other end of your connection, make sure that it is
running Cisco’s software release 9.14(5) or later and is using PPP encapsulation, not
High-Level Data Link Control (HDLC).
• If the framing errors are greater than 0, verify that the router on the other end of
the connection is running the PPP protocol.
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