152-319-100-02, Revision 02
Troubleshooting
H2TU-C-319 List 1 and List 1C
April 21, 2000
49
A3LB and A4LB Test Procedures
The H2TU-C-319 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 (see
“Setting the Loopback Time-out Option” on page 43
) 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 way to loop the H2TU-C down is to issue one of the
three loopdown commands listed in
. The automatic time-out mode is restored during subsequent
loopback sessions.
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. Information specific to HiGain Solitaire
regenerators is shown in bold.
Table 17.
Addressable Repeater Loopback Commands (A3LB and A4LB)
Name
Description
Binary Code
(a)
(Hexadecimal Equivalent)
(a) The left-most bit arrives first in all sequences. The detection algorithm functions reliably with a random 10
-3
Bit Error Ratio
(BER) on the facility. The entire arming and loopback sequence can also be initiated at the remote H2TU-R location.
NLOC
H2TU-C loopup from NI
1111-1111-0001-1110 (FF1E)
CREM
H2TU-C loopup from CI
0011-1111-0001-1110 (3F1E)
NRG1
H2RU regenerator 1 loopup from NI
1111-1111-0000-0100 (FF04)
CRG1
H2RU regenerator 1 loopup from CI
0011-1111-0000-0100 (3F04)
NRG2
H2RU regenerator 2 loopup from NI
1111-1111-0000-0110 (FF06)
CRG2
H2RU regenerator 2 loopup from CI
0011-1111-0000-0110 (3F06)
NREM
H2TU-R loopup from NI
1111-1111-0000-0010 (FF02)
CLOC
H2TU-R loopup from CI
0011-1111-0000-0010 (3F02)
SMJK
H2TU-R loopup from NI
11000-11000-11000 ...
SMJK
H2TU-R loopup from NI
(b)
(b) Not supported by A4LB.
100000 100000 100000 ...
SMJK
H2TU-R loopup from NI (ESF-DL)
1111-1111-0100-1000 (FF48)
Loopdown
H2TU-C and H2TU-R loopdown from NI OR CI
11100-11100-11100 ...
Loopdown
H2TU-C and H2TU-R loopdown from NI OR CI
100-100-100 ...
Loopdown
H2TU-C and H2TU-R loopdown from NI OR CI (ESF-DL)
1111-1111-0010-0100 (FF24)