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FSIP Port Adapters, Interface Cables, and Connections
Metric Thumbscrews
A pair of metric thumbscrews is included with each port adapter cable except V.35. If you plan to
connect serial cables to a remote device that uses metric hardware, replace the standard 4-40
thumbscrews at the network end of the cable with the metric, M3 thumbscrews.
To remove thumbscrews, use the flat side of a large (1/4-inch) flat-blade screwdriver to push the tip
of the screw into the connector housing and out the other side. (See Figure 19.) If the screw resists,
use pliers to pull it out. Insert the new thumbscrew and push it into the connector housing until it
pops into place.
Figure 19
Cable Connection Precautions
The router (port adapter) end of the FSIP serial interface cables must be connected to the 60-pin
receptacles on the port adapter as shown at the top of Figure 20. Although the 60-pin plug on each
cable is keyed for proper insertion, it can be forced onto the port adapter's receptacle if you are not
careful. Also, older serial cables, with fewer pins, cannot be used for the 60-pin receptacle on the
port adapter.
Figure 20
Correct
Incorrect, cable upside down
Incorrect, wrong cable
32 Fast Serial Interface Processor (FSIP) Installation and Configuration
Removing Thumbscrews
Correct and Incorrect Connection of FSIP Cables
Router port
FSIP Cable
Router port
SIP cable
FSIP serial
interface cable
FSIP serial
interface cable
SIP serial
interface cable
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