2-108 Cisco 7000 Hardware Installation and Maintenance
Preparing Network Connections
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 2-37 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 2-37 V.35 Adapter Cable Connectors, Network End
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 2-38 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).
Figure 2-38 X.21 Adapter Cable Connectors, Network End
EIA-530 Connections
EIA-530, which supports balanced transmission, provides the increased functionality, speed, and
distance of EIA/TIA-449 on the smaller, DB-25 connector used for EIA/TIA-232. The EIA-530
standard was created to support the more sophisticated circuitry of EIA/TIA-449 on the masses of
existing EIA/TIA-232 (DB-25) hardware instead of the larger, 37-pin connectors used for
EIA/TIA-449. Like EIA/TIA-449, EIA-530 refers to the electrical specifications of RS-422 and
H1616a
DTE
DCE
1
8
15
9
DCE
DTE
H1346a
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