A3Lb And A4Lb Test Procedures; Addressable Repeater Loopback Commands (A3Lb And A4Lb) - ADC H2TU-C-202 User Manual

Testing
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-202 List 2F 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 below. 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.
60
(a)
(Hexadecimal Equivalent)
October 25, 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)
LTPH-UM-1072-03
-3
Bit Error Ratio (BER)
H2TU-C-202 List 2F