Installing The Colu; Initialization Sequence - ADC PG-PLUS PLL-720 Technical Practice

Installing the COLU

I
NSTALLING THE
You can install the COLU in any slot except the three positions labeled COMMON, MUX 1, and MUX 2. Refer
to the cabling tables provided in the COTS documentation for slot and telco cabling assignment.
1. Open the retaining latch on the front of the COLU.
2. Insert the COLU into the card guides in a vacant slot in the COTS that corresponds to the location of the
wiring from the CO switch.
3. Engage the retaining latch to hold the card in place.
I
NITIALIZATION
The COLU continuously attempts to power up the RTs until end-to-end HDSL synchronization is established. If
the COLU is unable to establish synchronization, it powers down the loops and waits 5 minutes before re-trying.
The COLU initialization and power up sequence described below assumes that the HDSL and auxiliary
power pairs are wired from the COTS and terminated at the RTs. It also assumes the COTS has been wired
to CO battery, the bay fuses are installed, and the RTs are installed.
1. When the COLU is installed with power applied to the COTS, all LEDs turn on for about 1 second then go
off, except for the PWR LED.
2. After approximately 5 to 19 seconds, the PWR LED flashes.
To prevent the COLU from attempting to power up simultaneously, there is a 2 second delay between each
system in the COTS. For example, a COLU installed in slot 4 will power up 2 seconds after the COLU
installed in slot 2, and a COLU installed in slot 12 will power up 10 seconds after the COLU installed in slot
2. This delay is dependent on the COTS slot in which the COLU is installed, rather than on the number of
COLUs already installed in the COTS.
3. The COLU attempts to power up the RTs. Depending on the condition of the HDSL pair, one of the following
occurs:
a. The pair is open between the COLU and RTs:
• The PWR LED flashes for approximately 12 seconds, then remains on.
• The SYNC LED flashes for approximately 6 seconds, then remains off.
• A DSL PFO alarm is indicated on the
• The COLU waits 1 minute, then goes back to step 3.
b. One, or more, pairs are shorted or grounded between the COLU and RTs:
• The PWR LED flashes for approximately 12 seconds, then remains on.
• A DSL PFS alarm is indicated on the
• The SYNC LED flashes for approximately 6 seconds, then remains off.
• A DSL PFO alarm is indicated on the
• The COLU waits 1 minute, then go back to step 3.
8
COLU
S
EQUENCE
"HDSL History Screen" on page
"HDSL History Screen" on page
"HDSL History Screen" on page
January 6, 2003
SCP-PLL720-020-03H
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PLL-720, PLL-721 List 2's