Telephone line access system for main distribution frame

Details Telephone line access system for main distribution frame Telephone line access system for main distribution frame

H - Electricity

04

Q

379/117, 347/47

H04Q 1/14 (2006.01) H04M 3/18 (2006.01)

Patent

CA 1234209

ABSTRACT A system for accessing telephone lines at a main distribution frame includes an access block positioned between a vertical input terminal block and protector modules of the distribution frame. The access block has a set of terminals which make direct connection between the corresponding terminals of the input and protector modules and, in addition, includes a printed circuit with individual conductors coupled to respective ones of the access block terminals. Multiplexing circuitry connects with the printed circuit for sequential coupling of messages among the various telephone lines passing through the access block. Additional multiplexing circuitry is located on the distribution frame at a site remote from the input blocks and is coupled to the multiplexers associated with each of the input blocks to scan through the output signals of each of the multiplexers. The scanning operation also includes the operation of providing control and command signals to the multiplexers for sequencing through all of the telephone lines.

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