PairGain PG-Flex, Manual

Page: 59 / 168

Installing the Central Office Terminal Equipment
51
Install the Line Units
Install the COT line unit and verify operation as follows (see Figure 24 “Card Locations for a 19"
COT Shelf” or Figure 25 “Card Locations for a 23" COT Shelf”):
1 Insert the COT line unit into the COT shelf and verify:
• all LEDs on the Line Card turn on for about seven seconds, then scan from top to bottom
• PWR and FAULT LEDs turn on
• after four seconds, the COT starts its power management routine and the PWR LED flashes
2
Verify the following front panel indications after the system powers up and establishes HDSL
synchronized communications, and when no calls are in progress:
• POWER is on
• LOOP 1 SYNC is on
• LOOP 1 MARGIN is off
• LOOP 2 SYNC is on
• LOOP 2 MARGIN is off
• TEST is off
• FAULT is off
3 Measure the following voltages on the COT shelf backplane:
• -130 Vdc (±10%) between the HDSL_T1 pin and chassis ground
• 0 Vdc to +120 Vdc between the HDSL_T2 pin and chassis ground
4 Perform system setup, if not previously accomplished (refer to “Provisioning Your System” on
page 63).
Observe normal electrostatic discharge precautions when handling electronic equipment. Do not
hold electronic plugs by their edge. Do not touch components or circuitry.
If line powering fails, the COT line unit will attempt to connect with the RT line unit every minute.
If line powering succeeds, HDSL communications begins synchronizing and LOOP 1 SYNC and
LOOP 2 SYNC flash.