A3Lb And A4Lb Test Procedures - ADC HiGain H2TU-C-202 User Manual

Testing
5 Once the test is complete, do one of the following:
•
If the system is to loopdown but remain Armed, send the IR (Intelligent Repeater) LPDN code (universal
loopdown).
• If all the equipment is to be looped down, disarmed and returned to normal operation, send the disarm
inband code 11100 or the ESF-DL code (FF24).
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 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
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
subsequent 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. Information specific to HiGain HDSL2
regenerators is shown in bold.
Table 23. Addressable Repeater Loopback Commands (A3LB and A4LB)
Name Description
NLOC H2TU-C loopup from NI
CREM H2TU-C loopup from CI
NRG1 H2RU regenerator 1 loopup from NI
CRG1 H2RU regenerator 1 loopup from CI
NRG2 H2RU regenerator 2 loopup from NI
CRG2 H2RU regenerator 2 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.
50
"Setting the Loopback Time-out Option (LBTO Switch)" on page
Table
(b)
April 21, 2000
23. The automatic time-out mode is restored during
(a)
Binary Code
1111-1111-0001-1110 (FF1E)
0011-1111-0001-1110 (3F1E)
1111-1111-0000-0100 (FF04)
0011-1111-0000-0100 (3F04)
1111-1111-0000-0110 (FF06)
0011-1111-0000-0110 (3F06)
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)
152-202-115-04, Revision 04
46) determines
(Hexadecimal Equivalent)
-3
Bit Error Rate
H2TU-C-202 List 1E