Loopback Control Codes; Table A-1. Loopback And Control Codes - ADTRAN QDFR Unit Installation And Maintenance Practice

Quad Fiber Remote (QDFR) Unit Installation and Maintenance Practice

Loopback Control Codes

A summary of control sequences is given in
of 5 seconds to be detected and acted upon.
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.
Pattern Description
1in3
Loopdown QDFC and QDFR and disarm
3in7 QDFR DS1 loopback to network
4in7 QDFC DS1 loopback to network
5in7 QDFR DS1 loopback to customer
6in7 QDFC DS1 loopback to customer
3F1E QDFC DS1 loopback to customer
3F02 QDFR DS1 loopback to customer
3F02 QDFR DS1 loopback to customer
FF1E QDFC loopback to network
Will not loopup QDFC if QDFC already in loopback to customer
FF02 QDFR loopback to network
Will not loopup QDFR if any unit already in loopback to customer
2in5 Arm QDFC and QDFR. QDFR DS1 will loopup (toward Network only) if
NIU LB is enabled
3in5 Disarm and loopdown QDFC and QDFR
Restores Loopback Timeout Override after D5D6
D3D3 QDFC DS1 loops up toward pattern: 2 seconds AIS, 5 seconds data,
then 231 bit errors toward pattern. 231 bit errors every 20 seconds as
long as the pattern is present
C742 QDFR DS1 loops up toward pattern: 2 seconds AIS, 5 seconds data,
and then 20 bit errors toward pattern. 20 errors every 20 seconds as
long as pattern present
A-2
Table
NOTE

Table A-1. Loopback and Control Codes

A-1. All codes must be sent for a minimum
Source Arming
Required
NET No
CUST
NET No
NET No
CUST No
CUST No
CUST No
CUST No
NET Yes
NET No
NET No
NET No
CUST
NET No
CUST
NET Yes
CUST
NET Yes
CUST
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