A3Lb And A4Lb Test Procedures - ADC HiGain H2TU-C-231 List 3F User Manual

LTPH-UM-1149-01

A3LB and A4LB Test Procedures

The H2TU-C-231 List 3F 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 determines the duration 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 method to loop the H2TU-C down is to issue one of the three loopdown commands listed in
Table 24. The automatic time-out mode is restored during subsequent loopback sessions.
Table 24 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 24. Addressable Repeater Loopback Commands (A3LB and A4LB)
Name Binary Code
NLOC 1111-1111-0001-1110 (FF1E)
CREM 0011-1111-0001-1110 (3F1E)
NREM 1111-1111-0000-0010 (FF02)
CLOC 0011-1111-0000-0010 (3F02)
SMJK 11000-11000-11000 ...
SMJK 100000 100000 100000 ...
SMJK 1111-1111-0100-1000 (FF48)
Loopdown 11100-11100-11100 ...
Loopdown 100-100-100 ...
Loopdown 1111-1111-0010-0100 (FF24)
(a) The leftmost bit arrives first in all sequences. The detection algorithm functions reliably with a random 10
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-231 List 3F
(a)
(Hexadecimal Equivalent)
June 12, 2002
Description
H2TU-C loopup from NI
H2TU-C loopup from CI
H2TU-R loopup from NI
H2TU-R loopup from CI
H2TU-R loopup from NI
(b)
H2TU-R loopup from NI
H2TU-R loopup from NI (ESF-DL)
H2TU-C and H2TU-R loopdown from NI OR CI
H2TU-C and H2TU-R loopdown from NI OR CI
H2TU-C and H2TU-R loopdown from NI OR CI (ESF-DL)
Testing
-3
Bit Error Ratio (BER)
59