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61221002L2-5B A-1

HDSL MAINTENANCE MODES

This appendix describes operation of the HDSL2

system with regard to detection of in-band and ESF

facility data link loopback codes.

Upon deactivation of a loopback, the HDSL2 system

will synchronize automatically.

Loopback Process Description

In general, the loopback process for the HDSL2

system elements is modeled on the corresponding

DS1 system process. Specifically, the H2TU-C

loopback is similar to an Intelligent Office Repeater

loopback and the H2TU-R loopbacks are similar to a

T1 NIU.

The unit can detect the loopback activation or

deactivation code sequence only if an error rate of

-03

or greater is present.

Appendix A

HDSL2 Loopbacks

Loopback Control Codes

A summary of control sequences is given in Table

A-1.

NOTE

In all control code sequences presented, the

in-band codes are shown left-most bit transmitted

first, and the ESF data link codes with right-most

bit transmitted first.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 29 30

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