CHAPTER 1 GENERAL INFORMATION - TM-11-5805-688-14-10018

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

CHAPTER 1

GENERAL INFORMATION

b. Automatic diagnostic circuits in the multiplexer

1-1. DESCRIPTION AND PURPOSE.

set provide visual indications of error conditions and their

probable causes. The diagnostic circuits also produce

1-2. The AN/GSC-24(V) multiplexer set provides

associated electrical alarm signals that can be

asynchronous

time

division

multiplexing

and

transmitted to a remote facility for monitoring purposes.

demultiplexing capabilities in digital transmission

networks. The multiplexing function accepts up to 15

c. The

multiplexer

set

acquires

frame

channels of various lower rate digital input streams and

synchronization and maintains bit count integrity on all

interleaves them into a single high-speed digital stream

channels while accepting input data whose bit rates can

output. In turn, the demultiplexing function accepts a

vary within prescribed limits. Also, the multiplexer set

high-speed digital stream and separates the digital

automatically determines when an out-of-frame

stream input into a given number (up to 15) of lower rate

(synchronization) condition exists in the data message.

digital streams. The multiplexer set provides full duplex

When in an out-of-frame condition, the equipment

operation, performing independent and simultaneous

automatically and continuously attempts to reacquire

multiplexing and demultiplexing functions.

frame synchronization.

The reacquisition of frame

synchronization is automatically accomplished when the

NOTE

cause of an out-of-frame condition is removed.

In this manual, the circuits are

d. In the multiplexer, the overhead data required for

divided into one of three functional

the proper operation of the far-end demultiplexer are

groups. The circuits that perform the

automatically generated and transmitted in the

multiplexing function are referred to

multiplexer high-speed digital stream output.

The

as the multiplexer. The circuits that

demultiplexer, in turn, automatically decodes and uses

perform the demultiplexing function

the overhead data to maintain bit count integrity.

are referred to as the demultiplexer.

The circuits that perform the power

1-4. As shown in figure 1-1, the multiplexer set is

supply function are referred to as the

contained in a ruggedized aluminum chassis that is

power supply.

suitable for mounting in a standard relay rack. When the

unit is rack mounted, slide assemblies on each side of

1-3. The multiplexer set also has the following unique

the chassis allow it to be extended from the rack for

capabilities:

maintenance purposes. When fully extended on the

slides, the chassis can be tilted up or down and locked in

a. Voice data and digital data, supplied with and

position at an angle of 45 or 90. The functional circuits,

without timing, can be processed and multiplexed in the

less the power supply, in the

multiplexer set by the use of optional plug-in cards.

1-1