User's Manual

34 Researching the requirements

Interface (l/O) cables

I/O cables are typically 25conductor flat-ribbon or round cables interfaced

through RS-232-C connectors. These cables are used to connect data units

to printers, host computers, and modems.

UEM cable routing

Cables may be routed internally in the UEM horizontally in front and at the

rear of the card cage, vertically on the right side only and vertically through

square holes near the rear of the DEM. Cables may be routed externally in

the back of and on the left and right side of the UEM between the EMI/RFI

I/O panel and the rear cover. The cables may be routed in these channels up

to the top of the column or down to the floor through the pedestal.

Note:

Routing cables on the inside of a UEM from the front to the

back on the left or Power Supply side is not recommended. This is

because of the limited access in routing the cables and of the effects of

EMI/RFI noise generated in this area to signals in the cables.

Network to PE cabling

IPE cabling from Network to PE originates from the faceplate of the

Superloop Network card and extends to the backplane connectors on the

Controller card of the

lPE

Module.

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PE cabling originates from the faceplate of the Network card to the

faceplate of the Dual Loop Buffer.

Power and ground cables

For AC-powered systems, a 9-foot, three-conductor line cord is normally

supplied except in areas where conduit will be required. For DC-powered

systems, wiring is generally done through conduit.

installation planning 553-3001-120