Apparatus for interfacing with x21 equipment

Details Apparatus for interfacing with x21 equipment Apparatus for interfacing with x21 equipment

H - Electricity

04

L

354/235

H04L 25/02 (2006.01) H04L 1/24 (2006.01) H04L 12/26 (2006.01)

Patent

CA 1232968

- 23 - ABSTRACT APPARATUS FOR INTERFACING WITH X21 EQUIPMENT Apparatus for interfacing with X21 equipment is a microprocessor based device. The apparatus has a microprocessor 10 with associated memory 11, 12 which can be coupled to an X21 link by input/output devices 15, 16. The device 15 is a serial input/output device which is employed to operate bit/byte synchronous portions of the X21 protocol and the device 16 is a parallel input/output device which is arranged to carry out steady state functions. The apparatus can function as a tester for X21 equipment and may function as a DTE, a DCE or an exchange simulator between two DTES; alternatively it may function as an adaptor to allow non-X21 equipment such as a V24 terminal 41 to communicate with X21 equipment.

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