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DIGITAL LINK MEASURING INSTRUMENTS

188 For product ordering information, see pages 4 –10

GPIB

For Simultaneous Measurement of 30 Channels with MS120A

PCM CHANNEL ANALYZER

MS371A/A1

The MS371A/A1 is an overall measuring instrument with many mea-

suring functions for digital primary hierarchy transmission. It can be

used to measure (1) voice encode/decode performance characteris-

tics, (2) frame alignment/alarm test, (3) bit, code, and frame errors, (4)

timing jitter, and (5) signalling, etc.

The primary hierarchy (PCM) digital transmission system has been

commonly used as the foundation for ISDNs. Therefore, there are

many existing equipment and transmission channels to be maintained.

The necessary measurements are diverse and much time and labor

is needed to evaluate them when commissioning and maintaining

transmission circuits and equipment. The increasing number of PCM

systems has made improved measurement evaluation efficiency a

necessity.

The Anritsu MS371A/A1 has most of the functions required to measure

PCM systems. It is an all-purpose measuring instrument designed to

improve measurement efficiency. Measurements of PCM voice en-

code/decode performance require much time and labor. The MS371A/

A1 stores the measurement sequence and parameters in its internal

memory and makes automatic measurements to markedly improve

efficiency. It has a GPIB control function, which with the MS120A

Channel Selector permits measurement of 30 channels in one se-

quence. It also compares the measured results to a reference value,

judges them, and displays GOOD or NO GOOD automatically. The

measured results can then be printed out on the built-in printer.

Another special feature is that the report of the measured results can

also be printed out an external printer.

In conventional measuring systems, the results are edited by a per-

sonal computer or some other external device. However, the MS371A/

A1 performs this function internally and prints out to the external print-

er. This unique function can instantaneously prepare test performance

sheets during installation and report the results of periodic mainte-

nance without the need for manual or computer evaluation.

Features

•

Automatic measurement of A-A, A-D, D-A and D-D (A: analog,

D: digital)

This analyzer automatically measures most of the items stipulated in

ITU-T Rec. G.712/713/714. The test sequence and parameters are

stored internally, and new test sequences or parameters can be en-

tered by the operator. Also, measurement can be done manually or

via GPIB.

•

Frame alignment/alarm test

Frame alignment and alarm tests stipulated in ITU-T Rec. G.704/

O.162 can be made.

•

Error measurement

Error rate, error count, error second, and % error-free second can be

measured by detecting the bit, frame, and code errors.

•

Timing jitter measurement

Jitter modulation is available. Also jitter amplitude and jitter immuni-

ty can be measured.

•

Signalling measurement

Manipulation/monitoring of the signalling bit and E&M signalling dis-

tortion can be measured.

•

GPIB controller

A GPIB controller function has been incorporated. One to thirty

channels can be tested automatically and continuously through the

channel selector.

•

Built-in printer

Results are printed out by the built-in printer. In automatic measure-

ment, all results can be printed out or the printout can be limited to

results failing the evaluation.

•

External printer

Results from channels 1 to 30 can be edited according to measuring

item and printed out. A report, such as a test performance sheet, can

be prepared immediately after the completion of measurements.

(MS371A1)

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