Figure 24: Door Grounding Strap Placement - Tekelec 1100 Hardware Manual

Safety and Pre-Installation Requirements
must provide the sole grounding connection between the entire system and the central office
grounding.
WARNING: Always install an isolator pad between the frame and ground. Tekelec
frames are shipped with isolator pads to completely isolate the frames from ground.
If a non-Tekelec frame is used, an isolator pad must be provided.
The system can use three types of grounding paths:
Battery return
The battery return grounding path is the return path for all –48VDC loads in the system. This
path is isolated from other system grounds and connects to the rest of the central office through
the –48VDC return connections located on the breaker panels of each frame.
Logic Ground
Some system types require connection to a logic ground. The logic ground path provides a
common voltage reference point between all circuit boards of a system. Each connection
terminates to the system ground. The logic ground path is shown on your system's interconnect
drawing. The logic ground path does not carry current.
Note: If the AC-powered T1100 AS unit uses serial RS232 connections, the grounding in a
standard serial cable will provide the logic ground necessary for the data transmission.
Note: AC-powered T1100 AS units should not be used for RS485, DS0, or other network
connections unless specified by Tekelec.
Frame/chassis ground
The frame/chassis ground path provides a low impedance connection for all metal parts of
the entire system, including the frame, doors, shelves, and end panels. Each frame/chassis
connection within the system lineup terminates to the frame and connects to the main ground
by way of Htaps, #6 American Wire Gauge (AWG) to 1/0 cable.
Note: The frame/chassis ground path does not carry current.
For products installed in a frame, the doors installed are grounded to the frame through a
two-hole lug ground wire and through a screw-down latch.
Placement on page 36 shows a cutaway view example of an open frame door showing the door
ground strap.

Figure 24: Door Grounding Strap Placement

36
Hardware Manual
Figure 24: Door Grounding Strap
910-2969-001 Revision K, June 2009