CTC Union SHRM03b TDM Series, User Manual

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3.10.1 Select Loop back type
The loop back types supported include local digital, local, remote line, remote
payload, far end line, and far end payload loop backs. When line card
doesn’t connect to other remote side NTU,
There can display and supported include local digital, local, remote line,
remote payload loop backs.
3.10.2 Loop back types defined
1 Local Digital Loopback
2 Local Loopback
3 Remote Line Loopback
4 Remote Payload Loopback
5 Far End Line Loopback
6 Far End Payload Loopback
3.10.3 Select BERT pattern
The line card has a built-in Bit Error Rate Test generator that generates a
standard 2047 (211-1) test pattern. When using 2-wire SHDSL.bis configuration,
the generator can be activated for channel A or B from the menu.