A3Lb And A4Lb Test Procedures - ADC HiGain H2TU-C-388 List 1E User Manual

152-388-115-03, Issue 03

A3LB and A4LB Test Procedures

The H2TU-C-388 can be looped back by sending the Addressable Office Repeater (AOR) LPBK activation code
1111-1111-0001-1110 (FF1E) for at least 5 seconds. This causes the H2TU-C to enter the NLOC state. The
Loopback Time-out setting, detailed
of this loopback unless it is overridden by the reception of a second identical 16-bit loopup command before the
timer expires. When this time-out override state exists, the only way to loop the H2TU-C down is to issue one of
the three loopdown commands listed in
loopback sessions.
Table 23 summarizes the codes required to execute Addressable 3 and 4 (A3LB and A4LB) repeater loopback
commands. All code sequences must be present for at least 5 seconds.
Table 23. Addressable Repeater Loopback Commands (A3LB and A4LB)
Name Description
NLOC H2TU-C loopup from NI
CREM H2TU-C loopup from CI
NREM H2TU-R loopup from NI
CLOC H2TU-R loopup from CI
SMJK H2TU-R loopup from NI
SMJK H2TU-R loopup from NI
SMJK H2TU-R loopup from NI (ESF-DL)
Loopdown H2TU-C and H2TU-R loopdown from NI OR CI
Loopdown H2TU-C and H2TU-R loopdown from NI OR CI
Loopdown H2TU-C and H2TU-R loopdown from NI OR CI (ESF-DL)
(a) The left-most bit arrives first in all sequences. The detection algorithm functions reliably with a random 10
(BER) on the facility. The entire arming and loopback sequence can also be initiated at the remote H2TU-R location.
(b) Not supported by A4LB.
H2TU-C-388 List 1E
"Setting the Loopback Time-out Option" on page
Table 23. The automatic time-out mode is restored during subsequent
(b)
April 21, 2000
49, determines the duration
(a)
Binary Code (Hexadecimal Equivalent)
1111-1111-0001-1110 (FF1E)
0011-1111-0001-1110 (3F1E)
1111-1111-0000-0010 (FF02)
0011-1111-0000-0010 (3F02)
11000-11000-11000 ...
100000 100000 100000 ...
1111-1111-0100-1000 (FF48)
11100-11100-11100 ...
100-100-100 ...
1111-1111-0010-0100 (FF24)
-3
Bit Error Ratio
Testing
55