Carrier Access Access Navigator user manual Send DS1 Line Pattern with BER Test

Diagnostics & Troubleshooting

Send DS1 Line Pattern with BER Test

Field

p2e15

p2e23

qrss

Description

Send 215–1 pattern with a maximum of 14 consecutive zeros and 15 consecutive ones. (Provides maximum number of consecutive zeros permissible in framed, non-B8ZS testing.)

Send 223–1 pattern with a maximum of 22 consecutive zeros and 23 consecutive ones. (Maximum stress testing.)

Send QRSS pattern (a modified 220–1) with a maximum of 14 consecutive zeros and 20 consecutive ones. (Common stress test for T1 data applications.)

Send DS1 Line Pattern with BER Test

This command transmits an unframed test pattern and performs a Bit Error Rate Test (BERT) to verify the quality of the DS1 signal reaching far-end CSU equipment, such as the Access Bank II.

When the operator enters the test command, the Access Navigator generates and transmits the selected test pattern while using its internal Bit Error Rate Tester to measure the bit error rate (see Figure 15-25). Sending an unframed pattern will cause a DS1 Loss of Frame (LOF) on both the Access Navigator and the remote CSU for the duration of the test.

After 10 seconds the pattern is turned off and the test results from the BERT are displayed in a CLI message. (The send ds1 <n> off command is not required to turn off the pattern.)

NOTE: The DS1 must be set Out of Service, using the set ds1 <n> down command, before you can use loopbacks or test patterns.

NOTE: Sending an unframed pattern will cause a DS1 Loss of Frame (LOF).

NOTE: Put the remote CSU or NIU in line loopback mode before using this command for BER testing. (See DS1 CSU Loopup and DS1 Network Loopup.)

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 15-7).

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.

15-46 August 2003 Access Navigator - Release 1.8