Patent ID: 6049525
Filing Date: 2000-04-11
Classification: H04J,H04L

Abstract:
A method of constructing a terminal multiplexer, comprising steps of:providinga high speed transmission line interface unit responsible for signal input-output interface with a set of sending and receiving high speed transmission lines;a low speed transmission line interface unit responsible for signal input-output interface with a set of sending and receiving low speed transmission lines;a multiplex converting unit for performing multiplexing and demultiplexing between high speed signals transmitted on the high speed transmission lines and low speed signals transmitted on the low speed transmission lines, said multiplex converting unit being duplicated in the form of a working equipment and a protection equipment; anda switching unit for switching between the high speed signals transmitted on the high speed transmission lines and the low speed signals transmitted on the low speed transmission lines, said switching unit having an interface for signals from outside of the unit, which is made common with an interface for signals from outside of said multiplex converting unit;combining high speed transmission line interface unit, said duplicated multiplex converting unit, and said low speed transmission interface unit to construct a terminal multiplexer; andconstructing a channel rearrange equipment by substituting said switching unit for said multiplex converting unit of said terminal multiplexer, by the steps of:exchanging an electronic circuit board adapted for the protection equipment, which is not currently in operation, of said multiplex converting unit with an electronic circuit board adapted for said switching unit;switching the operation of said multiplex converting unit from the working equipment to the protection equipment;exchanging an electronic circuit board adapted for the working equipment, which is not currently in operation, of said multiplex converting unit with electronic circuit board adapted for said switching unit; andswitching back the operation of said multiplex converting unit from the protection equipment to the working equipment.