Carrier Access Access Navigator - Manual (Page 391)

Access Navigator - Release 1.8 August 2003 15-49
Diagnostics & Troubleshooting
Send DS1 Payload Pattern with BER Test
Send DS1 Payload Pattern with BER Test
This command transmits a framed test pattern and performs a Bit Error Rate Test (BERT) or pattern
synchronization test to verify the quality of the DS1 signal reaching far-end CSU equipment, such as
the Access Bank II. When the operator requests a p2e, qrss, or all-ones test pattern, the Access Navigator
transmits the test pattern while using its internal Bit Error Rate Tester to measure the bit error rate. See
Figure 15-26. For the all-zeros and 1-in-8 patterns, the Access Navigator tests for pattern
synchronization.
After 10 seconds the pattern is turned off and the test results from the BERT or pattern sync are
displayed in a CLI message. (The send ds1 off command is not required to turn off the pattern.)
NOTE:
The DS1 must be set Out of Service, using the set ds1 down command,
before you can use loopbacks or test patterns.
NOTE: Put the remote CSU in payload loopback mode before using this command for BER
testing. (See DS1 CSU Loopup on page 15-31 .)
NOTE: The internal Bit Error Rate Testers (BERTs) are always monitoring the DS1 inputs.
Anytime a BER test pattern is present, whether internally or externally generated, the BER for
the last one-second interval can be displayed using the status ds1 command (see Status
DS1 on
page 15-13 ). Bit errors are also recorded in the BERT log (see “BERT Log” on
page 7).
NOTE:
This command works with ESF and D4 (SF) framing.
NOTE: The p2e patterns are intended only for Access Navigator loop tests and for tests
between two Access Navigators. Other test equipment will not recognize these patterns.
Figure 15-26. Send DS1 Payload Pattern with BER Test
DS1
Line
Interface
Unit
Framer
Access Navigator
Time Slot
Interchange
Code
Generator
Bit Error
Rate
Tester
Payload
Pattern
with BERT
Framed
Pattern
IN
OUT
CSU
Access Bank II
Far End
Payload Loopup
DS0s