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Overview 1-7
PA-4T+ Receptacles and Cables
EIA/TIA-232 Connections
The router end of all EIA/TIA-232 adapter cables is a high-density 60-pin plug. The 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.
Note 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 PA-4T+ 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 PA-4T+ receptacles.
Note Do not use the Cisco Systems-provided EIA/TIA-232 adapter cable CAB-232MT= to
connect a PA-4T+ interface that is configured for DTE mode directly to an NEC - NEXTSTAR 1E
model C4969 MD/SAC unit interface that is configured for DCE mode. Doing so will keep transmit
and receive data signals from being properly exchanged between the two interfaces.
Instead, you must connect an additional, intermediate adapter cable—with standard EIA/TIA-232
DB-25 connectors at both ends—from the network end of CAB-232MT= to the standard
EIA/TIA-232 DB-25 connector (the DCE interface) on the NEC - NEXTSTAR 1E model C4969
MD/SAC unit. Cisco Systems does not provide this additional cable; however, its signals and pin
assignments are listed in Table 1-3.
Note You can use the Cisco Systems-provided EIA/TIA-232 adapter cable CAB-232FC= to
connect a PA-4T+ interface that is configured for DCE mode directly to an NEC - NEXTSTAR 1E
model C4969 MD/SAC unit interface that is configured for DTE mode.
Figure 1-4 EIA/TIA-232 Adapter Cable Connectors
H1343a
DTE
DCE