Nortel SR1001, Installation Manual, Page: 62 / 82

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CHAPTER 5
Troubleshooting Network Tests
SR1001 Installation Guide
Version 8.3.5
Network Tests
If the Secure Router is not working correctly after verifying that the cabling is correct between
the Nortel 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 Secure Router 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 SR1001,
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 14 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.