Specifications

3-22
Reference Guide
Model No.
Running Head
Powering Up the System System Installation
3.7 Powering Up the System
After connecting the chassis to the external power sources and making the proper ground
connections, apply power to the chassis. Plug the AC power cord into the associated electrical
outlets, or turn on the external DC power supply. Then, observe the following front-panel
LEDs:
1. The green power LED is lit on the power supply faceplate. If redundant power supplies
are used, this LED is lit on both cards.
2. If AC-to-DC converters are installed, their green power LEDs light.
3. If ringing generators are installed, their green LEDs flicker at a rate of 20 times per
second.
If these LEDs are not lit, first verify that the external power source is providing power to the
chassis, and check the connection between that source and the chassis. Also be sure each card
is firmly seated in its chassis slot.
If AC-to-DC converters are used, also check their jumper settings as previously described. If
all of these conditions are met, replace the card on which the green LED fails to light; that card
is faulty.
3.8 Installing the Other Plug-In Cards
Install the remaining cards into their designated chassis slots.
Some cards have on-board switches or jumpers that you must set before insertion into the
chassis. These cards and their settings are summarized at the beginning of this chapter. Also
refer to the associated card reference guides for detailed instructions for each card.
3.8.1 Interface Cards (8922 / 8923 / 8924)
Install an Interface (INF) Card (8922, 8923 or 8924) into the IF slot of the chassis. Only one
INF card is used in each system. This card provides the connections to the external user
interface control systems, alarm reporting facilities, and T1 and/or E1 networks and system
docking.