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Table 9: ALL 1'S TEST PATTERN FOR AMI AND B8ZS LINE CODE

Pattern Average Ones Dens-

ity

Maximum Zeros Circuit Stressed

All Ones (un-framed) 100% 0 Regenerator and DC current

All Ones (framed) 99.7% 1 Regenerator and DC current

5.7. ALL ZEROS TEST PATTERN

The ALL ZEROS test pattern must be used for verifying correct optioning for B8ZS line code. The all zero test pattern

should not be used as a stress test pattern.

5.8. BRIDGED TAP TEST

A problem, often encountered in the deployment of DS1 facilities via existing networks, is the "unrecorded" bridged tap.

A bridged tap is an unterminated pair of wires of unspecified length which generally occurs when service to one

customer is terminated and a portion of the same wire pair is re-used for a second customer. The wire run to the site of

the previous customer frequently remains connected. It is recommended that the bridged tap test pattern be used as a

tool to identify trouble conditions that may not be totally defined when using the standard stress tests. The test is used

on standard spans when other tests fail, or if a new pair is obtained on a maintenance case of trouble. This test is

conducted on the copper portion of the loop only.

Document T1M1.3/92-006R2, titled "A Technical Report on The Test Patterns for DS1 Circuits," is an excellent

resource for explanations of various test patterns used for testing DS1 circuits.

NOTE: For Maintenance, Bridged Tap tests are only required for a chronic trouble if the copper facilities were changed

to restore service. For Provisioning, Bridged Tap tests are only required when other stress test patterns fail on standard

spans.

5.9. NON-STANDARD TESTS - BILLABLE TESTS

Often, customers request the use of non-standard test patterns to identify DS1 circuit faults, e.g., the Daly Pattern (55

Octet). Trouble reports are not taken solely on the result of a failed 55 Octet test. Inform the customer that the pattern

they are requesting isn't an ATT standard test pattern. ATT will run the test pattern based upon the availability of test

sets that have the pattern requested. Circuits will not be redesigned based on the 55 Octet test. Follow normal

maintenance restoration procedures. ATT will not incur additional expense for engineering costs or redesigns with a

failed 55 Octet test.

NOTE:

The 55 Octet test and other non standard tests are billable tests for both provisioning and maintenance.

AT&T Practice ATT-TP-000-000-006

Issue 1, 08/25/06

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