Paradyne 3000 manual SGRD/FGRD Connection

COMSPHERE 3000 Series Carrier

NOTE

The power transformer unit output wires are terminated with plastic connectors. The power transformer unit must be installed so that the output wires protrude through the backplane at the rear of the carrier.

3.At the rear of the carrier (Figure 3-7), use the larger screwdriver to engage and tighten the two captive screws that fasten the power transformer unit to the carrier.

4.Plug the power transformer output connectors into the mating connectors on the backplane and latch them.

CAUTION

In Step 5, the power cord contains a 3-wire grounding- type plug which has a grounding pin. This is a safety feature. Grounding of the carrier is vital to ensure safe operation. Do not defeat the purpose of the grounding plug by modifying it or by using an adapter.

Prior to installation, use an outlet tester or voltmeter to check the ac receptacle for earth ground. If the power source does not provide a ground connection, consult an electrician to determine another method of grounding the carrier before proceeding with the installation.

5.Plug the appropriate end of the power cord into the ac receptacle on the carrier.

6.Plug the other end of the power cord into one of the convenience outlets inside the cabinet, or to an external ac outlet if the cabinet does not provide other outlets.

NOTE

In Step 7, the cover plate is installed at this time unless you are planning to install a fan module or SDCP.

7.If you are not installing a fan module or SDCP, replace the cover plate, then use the smaller screwdriver to engage and tighten the four captive screws.

SGRD/FGRD Connection

If all the DSUs and modems in the carrier are to have frame ground (FGRD) connected to signal ground (SGRD), install a wire strap (provided) between the SGRD and FGRD terminals at the rear of the carrier (Figure 3-7). The terminals are an insulation displacement type, with a slot designed to cut through the insulation on the wire.

NOTE

Signal ground must not be connected to frame ground when 3900 Series Modems are installed in the carrier.

To install a wire strap between the SGRD and FGRD terminals:

.Procedure

1.Use pliers to pull the plastic caps off the SGRD and FGRD terminals.

2.Insert one end of the strap into the SGRD terminal. It is not necessary to strip the wire.

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 (Figure 3-8).

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.

5.Insert the other end of the strap into the FGRD terminal and repeat Steps 3 and 4.

3-12 December 1994 3000-A2-GA31-80