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Configuration
TID-III CHANNEL MODULE OVERVIEW
The TID-III Data Channel Module functions as a single time independent data channel interface
within a network that may include synchronous, asynchronous, time independent, or encoded
voice channels.
The TID-III (Time Independent Data) Channel Module provides a unique solution for isochro-
nous/plesiochronous data communication for the MEGAMUX PLUS TDM. The TID-III Data
Channel Module accepts RS-422 data and clock inputs at any one of 18 standard rates from 1.0
kbps to 1.024 Mbps. The TID-III can be optioned to accommodate special rates within this range
or to automatically track variable rate input clocks up to a specified maximum. Channel features
are soft-controlled for the MEGAMUX PLUS TDM.
The TID-III Data Channel Module utilizes RS-422 clock and data inputs that are time indepen-
dent from the multiplexer timing and, through a unique bit stuffing algorithm, converts the iso-
chronous/plesiochronous data to the next higher TDM synchronous data rate. At the remote end
of the link, time independent data is recovered and the channel's numerically controlled oscillator
(NCO) generates the appropriate clock for output of data.
Five user selectable modes provide a variety of operational capabilities. Modes 1 through 3 pro-
vide for data bit delay and external receive clock timing, and allow tracking of input frequencies
that exhibit varying degrees of inaccuracy.
To summarize, the TID-III Module provides these features in the MEGAMUX PLUS:
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TID-III Applications
The TID-III supports data communications between multiple independently timed sources and
system where a master timing source is not available. The TID-III has the flexibilty to accommo-
date a wide variety of applications:
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Accepts RS-422 clock/data rates up to 1.024 Mbps.
Offers 18 standard binary rates up to 1.024 Mbps.
Accomodates special application rates.
Offers simplex or full duplex operation.
Makes available three programmable tracking modes to accommodate a wide variety
of input clock accuracies.
Has selectable options for channel bit delay and external timing input.
Operates on any network with satellite communications or multiple satellite hops.
Interfaces multiple, nonsynchronized clock and data sources such as DDS circuits to
a synchronized GDC TDM.
Interfaces nonstandard clock and data sources to a GDC TDM.
Interfaces external communication circuits exhibiting poor or unstable signal quality.
Interfaces variable rate nonstandard and nonsynchronized clock/data sources.
Operates in systems requiring distribution of telemetry and telecommunications data
to independently timed system users or nodes.
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036R660-000, Issue 10
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