
Configuring BayStack DSU/CSU Services
117021-A Rev. A 4-9
Pattern-2047 BERT Test
In the Pattern-2047 test, the DSU sends a 2047 BERT pattern to the carrier
network without initiating loopback (F
igure 4-8).
Figure 4-8. Pattern-2047 Test
The test allows you to connect a BERT tester at the remote end of a DDS line to
verify data passing across the line.
Telco-Activated Loopback
In addition to the tests you can initiate in the Configuration Manager, the
DSU/CSU supports two standard DDS loopback conditions to test local loops and
DDS termination equipment. The Telco facility initiates these tests upon
customer request:
• CSU Loopback -- Isolates trouble in the network
• DSU Loopback -- Like Digital Loopback, tests the local DSU/CSU and the
Telco circuit
LS0026A
Network
AN/ANH/ARN
DSU
CSU
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