AT&T 555-600-736 manual Multiplexer MUX

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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.

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Contents AT&T Merlin Legend Communications System Application Notes Page Merlin Legend Trunking Concepts Application Note Index TIP and Ring Explained Introduction to Trunking ConceptsLines and Trunks LOOP-START Trunks Operations Problem of Glare LOOP-START Trunks POTENTIAL-PROBLEMSAutomated Attendant Ghost Calls and Loop-Start Facilities LOOP-START Trunks When to USE LOOP-START Trunks Proper Loop-Start Facility ApplicationsUnavoidable Loop-Start Facility Applications Cost GROUND-START Trunks Operations GROUND-START Trunks When to USE GROUND-START Trunks GROUND-START Trunks Potential ProblemsDirect Inward Dialing did Trunks Operational Characteristics Types of Loop Reverse-Battery Signaling Did Trunk Signaling CharacteristicsAdministration Considerations in Using did Trunks When to USE did Trunks TIE TrunksSimple Tie Trunk Operation Tandem Tie Trunk Operation Signaling and Implementation TIE LinesTransferring Calls P E Transmit C E I V E ON-HOOK OFF-HOOK OFF Premises Stations Page Overview and Operations DS1 ServicePotential Problems/Limitations DESIGN, Signaling & ImplementationDo GBS Customers Need T-1? Data Communications EquipmentChannel Service Unit CSU Multiplexer MUX Isdn DS1 Facility ServicesSDN SID/ANI Maintenance and Troubleshooting Special HOTEL/MOTEL TrunksOperation Overview Hardware Module LINE/TRUNK Station Type Specifications TTR Trunk analog voice Reusable Modules from Merlin II R3 Considerations AdministrationReferences
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