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PA-4T Synchronous Serial Port Adapter Installation and Configuration
OL-3560-02
Chapter 1 Overview
Cables, Connectors, and Pinouts
Figure 1-3 Serial Port Adapter Cables
Metric (M3) thumbscrews are included with each port adapter cable to allow connections to devices that
use metric hardware. Because the 4T port adapter uses a special, high-density port that requires special
adapter cables for each electrical interface type, we recommend that you obtain serial interface cables
from the factory.
EIA/TIA-232 Connections
The router (VIP) end of all EIA/TIA-232 adapter cables is a high-density 60-pin plug. The opposite
(network) end of the adapter cable is a standard 25-pin D-shell connector (known as a DB-25) that is
commonly used for EIA/TIA-232 connections. Figure 1-4 shows the connectors at the network end of
the adapter cable. The system console and auxiliary ports on the Route Switch Processor (RSP) in the
Cisco 7500 series also use EIA/TIA-232 connections; however, the 4T port adapter interfaces support
synchronous serial connections, and the console and auxiliary ports only support asynchronous
connections. Use caution when connecting EIA/TIA-232 cables to the 4T receptacles.
(PA-4T port adapter)
Router connections
EIA/TIA-449 V.35 X.21
Network connections at the modem or CSU/DSU
H5763
EIA/TIA-232 EIA-530