V.35 Connections - Cisco 7000 Series Hardware Installation And Maintenance Manual

Preparing Network Connections
Figure 2-35

V.35 Connections

The V.35 interface is most commonly used in the United States and throughout Europe, and is
recommended for speeds up to 48 kbps (although in practice it is used successfully at 4 Mbps).
The router (FSIP) end of all V.35 adapter cables is a high-density 60-pin plug. The opposite
(network) end of the adapter cable provides a standard 34-pin Winchester-type connector commonly
used for V.35 connections.
Figure 2-36 shows the connectors at the network end of theV.35 adapter cable. V.35 cables are
available with a standard V.35 plug (male) for DTE mode or a V.35 receptacle (female) for DCE
mode.
Figure 2-36
X.21 Connections
The X.21 interface uses a 15-pin connection for balanced circuits and is commonly used in the
United Kingdom to connect public data networks. X.21 relocates some of the logic functions to the
DTE and DCE interfaces and, as a result, requires fewer circuits and a smaller connector than
EIA/TIA-232.
The router (FSIP) end of all X.21 adapter cables is a high-density 60-pin plug. The opposite
(network) end of the adapter cable is a standard DB-15 connector. Figure 2-37 shows the connectors
at the network end of the X.21 adapter cable. X.21 cables are available as either DTE (DB-15 plug)
or DCE (DB-15 receptacle).
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EIA/TIA-449 Adapter Cable Connectors, Network End
V.35 Adapter Cable Connectors, Network End
DTE
DCE
DTE
DCE