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Overview
This section provides an introduction to the MEGAMUX PLUS Time Division Multiplexer. The
information provided here and in other sections of this manual deals specifically with the oper-
ation of the MEGAMUX PLUS supervisory port CRT interface. For more detailed information
on the MEGAMUX PLUS system, refer to the MEGAMUX PLUS TDM Instruction Manual,
GDC Publication No. 036R360.
General Information
The MEGAMUX PLUS Time Division Multiplexer system mixes up to 54 channels of data
(synchronous, asynchronous, isochronous, or transition-encoded) or voice into a single aggre-
gate data stream. Synchronous data rates up to 1.984 Mbps, asynchronous rates up to 19.2 kbps,
and ischronous and transition-encoded rates up to 64 kbps may be handled by a data channel.
Voice II/CVSD channel speeds are selectable up to 64 kbps. Voice II/PCM, Voice II/ADPCM
and Voice II/ASP voice channels which operate at fixed data rates may be accommodated. The
TID-III Data Channel Module allows true isochronous/plesiochronous data communication in a
MEGAMUX PLUS TDM. Additionally, a Universal Voice Card/PCM channel which operates
at a fixed rate of 64 kbps and an ASP channel card and Universal Voice Card/ADPCM channel
which operate at variable rates may be accommodated. MEGAMUX PLUS handles any mix of
these channels into the aggregate data stream, with aggregate rates extending to 2.048 Mbps.
A variety of channel and aggregate interfaces are available, including EIA-232-D, RS-422, RS-
423, CCITT V.24/V.28, V.10, V.11, V.35, G.703 (64 kbps, 256 kbps, 2.048 Mbps), and MIL-
STD-188-114. The aggregate interface also supports T1 (with or without D4 framing) and fiber
optic interfaces.
Redundant operation ensures reliability in the MEGAMUX PLUS system. All "common set
components" (the components that mix and separate aggregate data) are monitored by the sys-
tem; if a component shows any indication of failure, a secondary replacement switches into op-
eration. With an optional D4/Diversity Module on a T1 link, a backup aggregate link can be
switched into operation if a primary link fails.
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036R660-000, Issue 10
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