Cisco Systems VIP-4R/4T manual Connect serial cables to the 4T port adapter as follows

VIP Port Adapter Functions

Attaching 4T Port Adapter Interface Cables

On a single 4T port adapter, you can use up to four synchronous-serial connections.

Connect serial cables to the 4T port adapter as follows:

Step 1 Attach the appropriate serial cable directly to the receptacle on the 4T port adapter and tighten the strain-relief screws. (See Figure 30.)

Figure 30 Connecting 4T Serial Cables (Horizontal Orientation—Shown without Handles)

EN

RC

CD

CD

CD

FAST SERIAL

TD

TC

RD

LB

TD

TC

RD

RC

LB

TD

TC

RD

RC

LB

TD

TC

RD

RC

LB

H5988

To DTE, DCE, or other external synchronus serial equipment

Caution Serial interface cables must be attached correctly or damage to the cable plug will result. Attempting to force a cable plug on the 60-pin receptacle can damage the plug. (See Figure 31.)

Figure 31 Connecting Serial Port Adapter Cables

Correct

4T port adapter interface cable

Router port

Incorrect, cable upside down

Router port

4T port adapter interface cable

H5764

Step 2 Attach the network end of your serial cable to your DSU, CSU, DTE, or other external synchronous-serial equipment and tighten the strain-relief screws.

VIP-4R/4T Installation and Configuration 59