A3Lb And A4Lb Test Procedures; Addressable Repeater Loopback Commands (A3Lb And A4Lb) - ADC HiGain H2TU-C-231 User Manual

LTPH-UM-1109-01, Issue 1
The Armed mode has an automatic time-out of 120 minutes, but this timer is reset to 120 for any
of the following events:
• Loopback terminates (manually or time-out)
• Query
• Alternate query
• Far End activate
• Another ARM command
This timer is inhibited while any of the valid command codes are being sent. Once the codes
are removed, the timer restarts at 120.

A3LB and A4LB Test Procedures

The H2TU-C-231 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-231 to enter the NLOC state. The
Loopback Time-Out setting (see
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-231 down is to issue one
of the three loopdown commands listed in
loopback sessions.
Table 18 summarizes the codes required to execute Addressable 3 (A3LB) and Addressable 4 (A4LB) repeater
loopback commands. All code sequences must be present for at least 5 seconds.
Table 18. 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
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 2
"Setting the Loopback Time-Out Option" on page
Table 18. The automatic time-out mode is restored during subsequent
(a)
(Hexadecimal Equivalent)
January 9, 2002
46) determines the duration
Description
H2TU-C-231 loopup from NI
H2TU-C-231 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
BER on the
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