2-16 Cisco 4000 Series Hardware Installation and Maintenance
Network Connection Considerations
Figure 2-13 EIA/TIA-232 Adapter Cable Connectors, Network End
EIA/TIA-449 Connections
EIA/TIA-449, which supports balanced (EIA/TIA-422) and unbalanced (EIA/TIA-423)
transmissions, is a faster (up to 2 Mbps) version of EIA/TIA-232 that provides more functions and
supports transmissions over greater distances.
The EIA/TIA-449 standard was intended to replace the EIA/TIA-232 standard, but it was not widely
adopted primarily because of the large installed base of DB-25 hardware and because of the larger
size of the 37-pin EIA/TIA-449 connectors, which limited the number of connections possible
(fewer than possible with the smaller, 25-pin EIA/TIA-232 connector).
The network end of the EIA/TIA-449 adapter cable provides a standard 37-pin D-shell connector.
(See Figure 2-14.) EIA/TIA-449 cables are available as either DTE (DB-37 plug) or DCE (DB-37
receptacle).
Figure 2-14 EIA/TIA-449 Adapter Cable Connectors, Network End
V.35 Connections
The V.35 interface is recommended for speeds up to 48 Kbps (although in practice it is used
successfully at 4 Mbps).
The network end of the V.35 adapter cable provides a standard 34-pin Winchester type connector.
(See Figure 2-15.) V.35 cables are available with a standard V.35 plug or receptacle in either DTE or
DCE mode.
H1343a
DTE
DCE
H1344a
DTE
DCE
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