LTPH-UM-1109-01, Issue 1 | Testing |
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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-231 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-231 to enter the NLOC state. The Loopback Time-Out setting (see “Setting the Loopback Time-Out Option” on page 46) 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-231 down is to issue one of the three loopdown commands listed in Table 18. The automatic time-out mode is restored during subsequent loopback sessions.
Table 18 summarizes the codes required to execute Addressable 3 (A3LB) and Addressable 4 (A4LB) repeater loopback commands. All code sequences must be present for at least 5 seconds.
Table 18. Addressable Repeater Loopback Commands (A3LB and A4LB)
Name | Binary Code (a) (Hexadecimal Equivalent) | Description |
NLOC | 1111-1111-0001-1110 (FF1E) | H2TU-C-231 loopup from NI |
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CREM | 0011-1111-0001-1110 (3F1E) | H2TU-C-231 loopup from CI |
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NREM | 1111-1111-0000-0010 (FF02) | H2TU-R loopup from NI |
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CLOC | 0011-1111-0000-0010 (3F02) | H2TU-R loopup from CI |
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SMJK | 11000-11000-11000 ... | H2TU-R loopup from NI |
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SMJK | 100000 100000 100000 ... | H2TU-R loopup from NI (b) |
SMJK | 1111-1111-0100-1000 (FF48) | H2TU-R loopup from NI (ESF-DL) |
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Loopdown | 11100-11100-11100 ... | H2TU-C and H2TU-R loopdown from NI OR CI |
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Loopdown | 100-100-100 ... | H2TU-C and H2TU-R loopdown from NI OR CI |
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Loopdown | 1111-1111-0010-0100 (FF24) | H2TU-C and H2TU-R loopdown from NI OR CI (ESF-DL) |
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(a)The leftmost bit arrives first in all sequences. The detection algorithm functions reliably with a random 10-3BER 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-231 List 2 | January 9, 2002 | 51 |