Installation manual

COMSPHERE 3000 Series Carrier

2-14 March 2001 3000-A2-GA31-F0

SGRD/FGRD Connection

Grounding reduces interference. To connect frame

ground (FGRD) to signal ground (SGRD) for all DSUs

and modems in the carrier, install the provided wire strap

between the SGRD and FGRD terminals at the rear of the

carrier. The terminals are an insulation displacement type,

with a slot designed to cut through the insulation on the

wire.

496-14805-01

P23

P21

SGRD

FGRD

E3 E1 E2

ALARM

NOTE

SGRD must not be connected to

FGRD when leased modems

are installed in the carrier.

" Procedure

1. Use pliers to pull the plastic covers off the

SGRD (E4) and FGRD (E3) terminals.

Plastic Cover

496-14656a-01

2. Insert one end of the strap into the SGRD

terminal. It is not necessary to strip the wire.

Hollow Tube

Wire End

Tube Slot

496-14656b-01

3. Fit the strap into the slot in the terminal. Replace

the plastic cap on the terminal, fitting the strap

into the matching slot cut lengthwise in the cap.

Cover Slot

496-14656c-01

4. Use a Phillips screwdriver to push the cap firmly

onto the terminal. As you seat the cap, the

terminal cuts through the insulation on the strap

and makes contact.

495-14656d-01

5. Insert the other end of the strap into the FGRD

terminal and repeat Steps 3 and 4.