Wandel & Goltermann PCM-4 E1 PCM Digital Multiplexer Channel Measuring Set
Model Number: PCM-4 

Sold As Spares And Repairs
Error Message On Start Up
Calibrating Errors, Clock Missing
No Further Testing Has Been Carried Out

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The PCM-4 PCM Channel Measuring Set can handle practically all PCM multiplexer measurements, and also measurements on the constituent subassemblies of digital exchanges. Trans multiplexer measurements are also possible because investigations between digital interfaces can be made. Single modules (e.g. CODECs) may also be checked as it is possible to carry out all measurements via 64 kbit/s interfaces.

The Compact PCM-4 has a complete range of functions for measurements between analog and digital interfaces. Besides the µP control and the interfaces, the PCM-4 has four main assemblies for carrying out a variety of measurements. These sub-assemblies are: a digital signal generator, a digital signal receiver, an analog generator and an analog receiver. The PCM-4, which exploits digital signal processing and microprocessor control to the full, is so accurate that it can operate near the the theoretical limits of the PCM technique. The integral screen has two advantages: firstly user-friendly operation and numerical display, secondly graphic output display. It only requires a few keystrokes to output graphs showing gain vs. frequency, gain vs input level, or total distortion. To adapt a wide range of test items the PCM-4 has special keys for selecting the X and Y ranges. Other measurements such as idle channel noise, crosstalk or bit error count can be shown as histograms. The telephone channels are shown along the X-axis.

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SA 287749