Cisco MWR-1941-DC-2T1 Hardware Installation Guide - Page 86
X.21 Interface
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Serial Connection Signals and Pinouts Appendix B Cable Specifications X.21 Interface This section contains the following topics: • X.21 Connections • X.21 Serial Cable Assembly 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 network end of the X.21 adapter cable is a standard DB-15 connector. (See Figure B-13.) X.21 cables are available as either DTE (DB-15 plug) or DCE (DB-15 receptacle). Figure B-13 X.21 Adapter Cable Connectors, Network End DTE 8 1 15 9 DCE H1346a X.21 Serial Cable Assembly Figure B-14 shows the X.21 serial cable assembly. Table B-14 lists the DTE pinout and Table B-15 lists the DCE pinout. Arrows indicate signal direction: -> means DTE to DCE and
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