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CHAPTER 5
Troubleshooting
Network Tests
Installation Guide: 601, 602, and 604 Routers
Network Tests
If the system is not working correctly after verifying that the cabling is correct between the
Alcatel router and the external network equipment, run these basic tests to isolate the
problem to the LAN port, WAN link, or serial interface ports.
Ping Test
The Ping test checks connectivity between the Alcatel system and another host system on the
LAN. If an “unknown host” error occurs after initiating this test, the destination host is either
unreachable or unstable, or it does not exist. If a 100 percent packet loss error occurs, the
LAN is either down or unstable.
ping
Use this command to check connectivity with another system.
Other Tests
To isolate problems with a faulty WAN link, perform line or payload loopbacks at either end of
the link and perform a BERT test. These functions isolate a problem to either the OmniAccess
601, OmniAccess 602, and OmniAccess 604, far-end equipment, interconnect cabling at either
end, or the link between the two systems.
Loopback Test
To perform line and payload loopbacks at either end, use the appropriate derivative (T1/E1) of
the following commands.
The following loopback command is available.
test t1 loopback
BERT Test
This command is used to initiate a bit error rate test. The following BERT test command is
available to test specific links.
test t1 bert
The pattern parameter may have any of the following values:
Table 16 BERT Test Patterns
Pattern
Description
2^11
Pseudorandom pattern with no more than 10 consecutive zeros and no more than 11
consecutive ones.
2^15
Pseudorandom pattern with no more than 14 consecutive zeros and no more than 15
consecutive ones. Use this pattern for testing at data rates above 19.2 kbps
(G.703-standard test).
2^23
Pseudorandom signal with no more than 22 consecutive zeros and no more than 23
consecutive ones. This pattern provides the highest stress of all BERT patterns.
QRW
Quasi-random waveform pattern (default). This pattern simulates live data.
