ET2021 X.21 Circuit Tester

  • Speed - up to 2.048Mb
  • Clock Frequency measurement
  • BERT (PRP15) generator/checker
  • Round Trip Delay Measurement
  • Clock phasing error detection
  • Data inversion detection
  • LCD display - frequency/error counts
  • Battery powered - typically 16 hours
  • Socket for external power feed
Product Description

The ET2021 is a part of the PDA range of pocket size testers specifically designed aiding the installation, commissioning and fault finding on high speed circuits.

The product incorporates many features that allow a user to quickly identify operational problems. When plugged into an X.21 interface the unit can measure the clock frequency to an accuracy of 0.5KHz up to a frequency of 2048KHz. For systems where an external clock is required, the ET2021 can provide a selection of clock speeds.

The unit incorporates a standard PRP15 test pattern generator and checker and is down line compatible with the ET2000 G.703/G.704 diagnostic test set. In this mode the unit can detect and display transmission errors but also it is capable of identifying wiring and system problems. Phasing errors due to the inversion of the clock signals with respect to the data are identified by the ET2021, as is the receipt of an inverted PRP15 test pattern

To aid in identifying transmission problems, the ET2021 can be set to transmit either continuous 1 or 0 data bits. Input impedancecan be set either to high impedance (Hi-Z) or standard termination impedance of 110ohms. The Hi-Z mode allows the ET2021 to be used in monitoring.

ET2021 X.21 Circuit Tester Specification

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