Specifications

C-5
Cisco 7100 Series VPN Router Installation and Configuration Guide
78-6341-03
Appendix C Cable Specifications
Cisco 7120-4T1 and Cisco 7140-8T Cables and Pinouts
Figure C-2 shows the RJ-45 cable connectors.
Figure C-2 RJ-45 Plug and Receptacle
Cisco 7120-4T1 and Cisco 7140-8T Cables and Pinouts
The four T1 ports on the Cisco 7120-4T1 and the eight T1 ports on the Cisco 7140-8T and adapter cables
allow a high density of interface ports, regardless of the size of the connectors typically used with each
electrical interface type. All ports use an identical 60-pin D-shell receptacle that supports all interface
types:
• EIA/TIA-232
• V. 3 5
• EIA/TIA-449
• X.21
• EIA-530
Each port requires a serial adapter cable, which provides the interface between the high-density serial
port and the standard connectors that are commonly used for each electrical interface type.
Note The adapter cable determines the electrical interface type and mode of the port (DTE or DCE) to which
it is connected.
The network end of the cable is an industry-standard connector for the type of electrical interface that
the cable supports. For most interface types, the adapter cable for DTE mode uses a plug at the network
end, and the cable for DCE mode uses a receptacle at the network end. Exceptions are V.35 adapter
cables, which are available with either a V.35 plug or a receptacle for either mode, and the EIA-530
adapter cable, which is available only in DTE mode with a DB-25 plug at the network end. The mode is
labeled on the molded plastic connector shell at the ends of all cables except V.35 (which uses the
standard Winchester block-type connector instead of a molded plastic D shell).
Caution Serial interface cables must be attached correctly, or damage to the cable plug will result. Attempting to
force a cable plug on the 60-pin receptacle can damage the plug. (See Figure C-3.)
H2936
8 7 6 5 4 3 2 1
RJ-45 connector