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Newsletter: Precision Delay Measurement

GL's Precision Delay Measurement measures the Round trip Delay of a system. Round trip delay measurement is done by sending a BER pattern with the insertion of an errored bit and timing the reception of the errored bit. Measurement is precise and accurate to the microsecond level. A delay up to 8 seconds can be measured. The internal delay of the card is subtracted from the round trip delay.

The delay measurement can be made

  • For the entire bandwidth or specific timeslots.
  • DS0 Data Rate for T1 Systems can be set to 56K by checking 56 K Mode. This mode is useful when 'robbed bit signalling' is used in the system.

In the Precision Delay Measurement Application, the T1/E1 card transmits a QRSS pattern with an error bit and starts the counter. The BER Pattern gets looped back by an external system or network and the received bit stream is searched for the error bit that was transmitted. Round Trip Delay is calculated as the time difference between the transmission and reception of the error bit.

Please give us a call if you are interested in GL's Precision Delay Measurement or in any of GL's other product. We would be happy to consult with you on solutions to your testing needs and we look forward to hearing from you.

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