PCM-40 datasheet(2/6 Pages) JDSU

2 / 6 page

PCM-40 PCM Channel Analyzer

Automatictestsequences

You can produce automatic test sequences by

combiningseveraltestconfigurationstogether

fromtherangeofsetupswhichyouhavestored.

All of the measurement functions included in

the PCM-40 along with any variations in test

variables, parameters and tolerance limits,

can be used for this in any order required. The

sequence can be programmed to stop if an

incorrect result is obtained or before each dif-

ferentmeasurementtask.

Monitoringdigitalpathsinthroughmode

orviahigh-impedancetaps

Forlong-termmonitoringof2Mb/spaths,the

circuit can be looped-through the PCM-40

transparently or tapped via a high impedance

monitorpoint.Ifthepowersupplyfailsduring

loop-throughmeasurements,thesignalpathis

not interrupted. The following measurements

canbeperformed:

• Frame monitoring with FAS errors recorded

as histograms

• Level, frequency and coder level monitoring

including audio monitoring in a selected

channel

• Recording of byte changes in the selected

frame or data channel

• Signaling status display for individual chan-

nels

Qualitymonitoringinanidlechannel

Facilities for monitoring the quality of PCM

systemswhichdonotuseCRCframesarelim-

itedtomonitoringtheframealignmentsignals.

The PCM-40 can, however, perform a loop-

back or end-to-end measurement to ITU-T

G.821 in an idle channel. The instrument

transmits a test pattern which it then evalu-

ates.Theresultscanbeshownasatableorasan

errorhistogram.

PCM-40 as an automated measuring

system

When testing PCM multiplexers, the PCS-40

channel selector connects up to 30 analog TX

and RX channels sequentially to the PCM-40

analogtestports.ThePCS-40channelselector

allowsreturnlossandlongitudinalconversion

loss measurements on individual VF channels

using the built-in bridges. Also test needing

D.C. loop holding circuit or feeding bridge are

possible. The result is a flexible and powerful

test system well suited to production, installa-

tionandmaintenanceof2Mb/smultiplexers.

The fall-off in gain can be clearly seen. The blue trace

was recorded on commissioning the system, the red

trace at a later date. The “DIFF RESLT” function de-

termines the difference between the two traces. The

zoom function and cursors allow every detail to be

examined.

A test configuration (setup) includes all test and inter-

face parameters required to perform a measurement.

The setup name is used to relate the setup to a particu-

lar device under test.

Errors in the idle channel shown with their times of

occurrence. Sporadic faults can thus be easily seen and

matched in time to possible sources of interference.

Automatic sequential connection of up to 30 analog

Tx and Rx ports of a PCM MUX equipment to the

PCM-40 channel analyzer.

30 channel automatic sequential weighted noise mea-

surement

PCM-40

PCS-40

Channel

Selector

PCM

MUX

Ch x

Ch 1 to 30

PCM-40 Datasheet(PDF) 2 Page - JDS Uniphase Corporation

PCM-40 Datasheet(HTML) 2 Page - JDS Uniphase Corporation

Html Pages

1 2 3 4 5 6

Datasheet Download

Link URL