Add drop multiplexer

Details Add drop multiplexer Add drop multiplexer

1989-09-26

1991-05-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 8512, H04J 308

Patent

active

050181351

ABSTRACT:
The present invention relates to an add drop multiplexer related to the synchronous multiplexing method, and includes a pass-through line connecting unit, which is driven by a timing signal extracted from a signal received through a transmission line and effects branching and insertion of the line as well as connection of pass-through lines at multiplexed levels; an office line connecting unit having an office interface function for each of other devices in a same office; a first frame aligner connecting multiplex branched signals from the pass-through line connecting unit with the office line connecting unit; and a second frame aligner connecting multiplex inserted signals from the office line connecting unit with the pass-through line connecting unit. In this way, since the whole pass-through line connecting unit can be driven only with the timing signal extracted from the received signal from the transmission line and the frame aligner can be removed from the path of the signal through the pass-through lines, it is possible to reduce the signal delay in the pass-through lines within the add drop multiplexer.

REFERENCES:
patent: 4569041 (1986-02-01), Takeuchi et al.
patent: 4797882 (1989-01-01), Maxemchuk
patent: 4860282 (1989-08-01), Itoh et al.
patent: 4860284 (1989-08-01), Brown et al.
Wakabayashi et al., "A Synchronous D.53 Add/Drop Multiplexer with Cross-Connect", I.E.E.E. Global Telecommunications Conference, Dec. 1-4, 1986, pp. 1195-1199.

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