ADTRAN 1245001L6, Руководство по установке и обслуживанию

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61245001L6-5G Section 61245001L6-5, Issue 7 A-3
Table A-2. Inband Addressable Loopback Codes
Code and
Function Response
Arm ............................................... 11000 (also known as a 2-in-5 pattern)
The HTU-R will loop up towards the network. No AIS or errors will be sent as a result of this
loopback. The HTU-C and HRE will arm.
Disarm ........................................... 11100 (also known as a 3-in-5 pattern)
The HTU-C and HRE are removed from the armed state. If any of the units are in loopback when the
11100 pattern is received, they will loop down. The LBK LEDs will turn
off on all units.
HTU-C Network Loop-up ............. D3D3 (1101 0011 1101 0011)
If the units have been armed and no units are in loopback*, the HTU-C will loopup towards the
network, 2 seconds of AIS (all 1s) will be sent, 5 seconds of data will pass, and 231 bit errors will be
injected into the DSX-1 signal. As long as the pattern continues to be sent, 231 errors will be injected
every 20 seconds. When the pattern is removed, the unit will remain in loopback. If the pattern is
reinstated, the injection of 231 bit errors will resume at 20-second intervals.
HRE Network Loop-up ................. C741 (1100 0111 0100 0001)
If an HRE is present, the units have been armed, the HRE will loopup towards the network, 2 seconds
of AIS (all 1s) will be sent, 5 seconds of data will pass, and 10 bit errors will be injected into the
DSX-1 signal. As long as the pattern continues to be sent, 10 errors will be injected every 20 seconds.
When the pattern is removed, the unit will remain in loopback. If the pattern is reinstated, the
injection of 10 bit errors will resume at 20-second intervals.
HRE2 Network Loop-up ............... C754 (1100 0111 0101 0100)
If a second HRE is present, the units have been armed, the HRE will loop up towards the network, 2
seconds of AIS (all 1s) will be sent, 5 seconds of data will pass, and 200 bit errors will be injected into
the DSX-1 signal. As long as the pattern continues to be sent, 200 errors will be injected every 20
seconds. When the pattern is removed, the unit will remain in loopback. If the pattern is reinstated,
the injection of 200 bit errors will resume at 20-second intervals.
Loopdown ..................................... 9393 (1001 0011 1001 0011)
Any HTU-C and HRE units currently in loopback towards the network will loopdown and will retain
the armed state.
Query Loopback ............................ D5D5 (1101 0101 1101 0101)
If the units are armed and the HTU-C, HRE, or HTU-R are in network loopback, errors are injected
into the DSX-1 signal upon detection of the query loopback pattern. As long as the pattern continues
to be sent, errors are injected again every 20 seconds. The number of errors injected each time
depends on which unit is in loopback. If the HTU-C is in network loopback, 231 errors are injected,
20 at a time if the HTU-R is in network loopback, 10 at a time if HRE #1 is in network loopback, and
200 at a time if HRE #2 is in network loopback.
Loopback Timeout Override .......... D5D6 (1101 0101 1101 0110)
If the units are armed and this pattern is sent, the loopback timeout will be disabled. The timeout
option will be updated on the Provisioning menu of the HTU-R (viewable through the RS-232 port) to
None. As long as the units remain armed, the timeout will remain disabled. When the units are
disarmed, the loopback timeout will return to the value it had before the D5D6 code was sent.
Span Power Disable ...................... 6767 (0110 0111 0110 0111)
If the units are armed and this pattern is sent, the HTU-C will deactivate its span power supply,
turning off the HTU-R and HRE (if present). As long as the pattern continues to be sent, the span
power supply will remain disabled. When the pattern is no longer being sent, the HTU-C will
reactivate its span power supply, turning the remote unit(s) on. All units will retrain and return to the
disarmed and unlooped state.
Note: All codes listed above must be sent for a minimum of 5 seconds in order for them to be detected and acted upon.
* If NIU is enabled, then the HTU-R can be in network loopback when the HTU-C or HRE loopup codes are sent.