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MULTIPLEXER (MUX)
Multiplexer are devices that combine several individual information-carrying channels for transmission
over an aggregate link. This is done by allotting this aggregate link to multiple users, in turn to constitute
different intermittent channels or time slots (time division multiplexing for digital transport.)
A Multiplexer in general would only be required for large PBX systems using multiple 100D DS1 Modules
where all B channels are assigned to various ISDN services. Customers would have complex voice/data
networks, have multiple locations, and usually a large investment in private line facilities.
AT&T ACCULINK Multiplexers, for example, can combine up to 128 input channels into a single digital
stream for cost-effective protocol-independent transmission.
Each data ACCULINK channel can be
programmed individually for a wide variety of data rates, ranging from 300 bps to 64 Kbps. Special
application multiplexer, such as the ACCULINK 740 and 741, are designed to drop/insert data or video
channels from/to a DS1 data stream originating from a digital PBX such as System 25 or System
75/Generic while passing the remaining DS1 voice channels through to the digital PBX.
A special type of multiplexer which can be used on a MERLIN LEGEND system is an ACCULINK
Multiplexer. It would connect on the PRI side of the switch to the 100D DS1 Module. A 740/741 mux
provides preselected voice, data. or video signals to be added to or removed from the DS1. while allowing
the remaining DS1 voice channel to pass to the DS1 module. By the use of optional channel cards, a
740/741 can support up to 19.2 kbps asynchronous, or 56/64 kbps synchronous transmission.