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Page Title: Figure 5-2. Overhead Message Format
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T.O. 31W2-2GSC24-2
TM 11-5805-688-14-1
NAVELEX 0967-LP-545-3011
5-13. OVERHEAD MESSAGE FORMAT.
23-bit stuff code, a 5-bit port number, and a sense bit.
5-14.  As noted in the message format discussion in
5-15.  The 23-bit stuff code is one of three different
paragraph 5-7, overhead data are inserted in the
forms, indicating positive, negative, or no-action stuffing
multiplexer output data stream.  The overhead data
operations  performed  by  the  multiplexer.  Frame
consist of a framing or synchronization pattern for the
synchronization circuits in the demultiplexer are designed
receiving  demultiplexer,  and  information  regarding
to detect and initially synchronize with any one of the
stuffing actions performed as part of the multiplexer's
three 23-bit stuff codes.
Other circuits in the
input rate buffering process. The latter information
demultiplexer, operating on the basis of the particular
enables the demultiplexer to properly perform its
stuff  code  (one  of  three)  detected,  control  the
destuffing and smoothing operations.
A complete
demultiplexer destuffing and smoothing functions. Thus
overhead message is contained in each minor frame of
the 23-bit stuff code serves a dual purpose: it enables
the multiplexer's output message.
The overhead
initial  demultiplexer  frame  synchronization  and
message consists of a 29-bit word, with one bit located in
determines the type of destuffing and smoothing
the first bit position of each of the 29 data words
operation the demultiplexer is to perform.
comprising the minor frame. Figure 5-2 illustrates the
manner in which the overhead word is interleaved into
5-16.  To enable the demultiplexer to fully synchronize
the multiplexer's output. The figure shows that the
with the transmitting multiplexer and properly perform its
overhead word conveys three types of information: a
Figure 5-2. Overhead Message Format
5-4

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