ADC PG-Flex FRL-842, Руководство пользователя

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SCP-FRL842-013-01H April 22, 2003
10 ADC Telecommunications, Inc.
Initialize and Power Up the FRL-842
By default, the FLL-812/FLL-814 periodically attempts to power up and synchronize with the FRL-842 and/or
Doubler Unit(s) in the circuit until end-to-end HDSL synchronization is established. If the FLL-812/FLL-814 is unable
to establish synchronization, it powers down the loops and waits approximately one minute before re-trying. The
FLL-812/FLL-814 repeats this process continuously until it is able to synchronize with the FRL-842 or doubler.
When the FLL-812/FLL-814 synchronizes with the FRL-842, the following occurs:
1. When the FRL-842 is installed with power applied to the COT shelf, all LEDs turn on for one second, then go
off. The PWR Led remains on.
2. After a few seconds, SYNC LEDs for Line 1 and Line 2 begin to flash.
3. After 30 to 60 seconds, SYNC LEDs for Line 1 and Line 2 remain on.
4. Assumption: The HDSL margins are above alarm thresholds and there are no subscriber drop tests or other
alarm/faults in the system. Therefore, verify Table 4 front panel indications after the system powers up and
establishes HDSL synchronized communications
Table 4. FRL-842 LED Status
The FLL-812/FLL-814 initialization and power up sequence described below assumes:
• HDSL pairs are wired from the COT shelf, through doubler housings (if required) and terminated at
the RT enclosure
• Auxiliary Power pairs (when using doublers) are wired from the COT shelf and terminated at the RT
enclosure (these pairs do not need to pass through the Doubler housing)
• COT shelf has been wired to CO battery
• Bay fuses have been installed
• Doublers (if required) have been installed
• FRL-842 has been installed
LED Status
PWR On
LOOP 1 SYNC On
LOOP 1 MARGIN Off
LOOP 2 SYNC On
LOOP 2 MARGIN Off
TEST Off
ALARM Off
FAULT Off
It takes approximately two minutes before end-to-end synchronization is established with two doublers
installed in the circuit. However, depending on the condition of the cable plant and length of the spans, it
may take up to four minutes before synchronization is established.