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

152-202-116-02, Issue 2
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 1F 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
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 Table
Table 20 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 20. Addressable Repeater Loopback Commands (A3LB and A4LB)
Loopback Binary Code
NLOC 1111-1111-0001-1110 (FF1E)
CREM 0011-1111-0001-1110 (3F1E)
NRG1 1111-1111-0000-0100 (FF04)
CRG1 0011-1111-0000-0100 (3F04)
NRG2 1111-1111-0000-0110 (FF06)
CRG2 0011-1111-0000-0110 (3F06)
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 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.
H2TU-C-202 List 1F
Table 5 on page
20. The automatic time-out mode is restored during subsequent loopback sessions.
(a)
(Hexadecimal Equivalent)
March 14, 2000
14) determines the duration of this loopback unless it
Description
H2TU-C loopup from NI
H2TU-C loopup from CI
H2RU regenerator 1 loopup from NI
H2RU regenerator 1 loopup from CI
H2RU regenerator 2 loopup from NI
H2RU regenerator 2 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
47