ADTRAN 1200218L1, User Manual

Page: 84 / 122

Chapter 6. Diagnostics
6-12 OSU 300 User Manual 61200663L1-1
Remote Port and Payload Loopback
During this test, the local unit commands the far-end unit to
perform a payload loopback test for the selected Quad DSX-1
interface card. This results in all of the DSX-1 interfaces in the local
unit being looped back. See Figure 6-17 for an illustration of this
test.
Figure 6-17. Remote Port Payload Loopback Test
BERT Configuration
The following options apply to any of the tests involving BERT
testing.
Pattern
Select the desired test pattern for the BERT test (see Figure 6-18 on
page 6-13). The internal test pattern generator can be configured for
the following types of test patterns:
The test pattern is used to independently test the operation of the
framing circuitry and the network interface of the OSU 300. Instead
OSU 300 OSU 300
T3
DSX-1
Quad DSX-1
DS3 MUX DS3 MUX
Far-end unit responds
to port loopback Local port in Remote
Port Payload Loopback
• All zeros • 2^15-1
• All ones • 2^23-1