PairGain PG-Flex, Manual

Page: 58 / 168

Installing PG-Flex System Hardware
50
Install the Alarm Unit or the PGTC
Insert the FAU-728 List 2 (alarm unit) or FPI-729 List 1 (PGTC interface) into the PG-Flex COT
shelf and verify the following:
• front panel LEDs scan from top to bottom
• after the scan completes, all LEDs should blink twice
• PWR LED should remain on, all other LEDs turn off
Apply the following rules when installing the alarm unit or PGTC interface into a PG-Flex system:
• To provide clocking to PG-Flex ISDN channel units, you must have:
– the composite clock on the PG-Flex COT shelf connected and properly terminated
– the alarm unit or PGTC interface card installed at all times
• Do not connect metallic bypass pairs between PG-Flex systems or to other DLC systems.
To install the alarm unit or PGTC interface into a List 1 or List 4 FCS-718 or FCS-719 PG-Flex COT
shelf, you must terminate the composite clock using a 130 ohm to 135 ohm resistor. (Refer to
“Connect the Composite Clock” on page 46.)
Observe normal electrostatic discharge precautions when handling electronic equipment. Do not
hold electronic plugs by their edge. Do not touch components or circuitry.
An FPI-729 List 1 PGTC Interface Unit or an FAU-728 List 2 Alarm Unit must be installed at all
times when ISDN channel units are installed. These units provide the composite clock reference
source for the ISDN channel units and is required for normal operation of the ISDN channel
units. Removing the FPI-729 List 1 or FAU-728 List 2 during an ISDN will terminate the call.