JITTER MEASUREMENT IN PDH/SDH-BASED TELECOMMUNICATION NETWORKS: OPTIMISATION AND PERFORMANCE ASSESSMENT OF A DIGITAL SIGNAL PROCESSING METHOD
L. Angrisani, A. Baccigalupi, A. Di Meo
Abstract:
The paper deals with jitter measurement in PDH/SDH-based telecommunication networks. The attention is mostly paid to the accuracy assured by any PDH/SDH analyser compliant the ITU-T recommendations, which seems to be unsatisfying for both designers and manufacturers. Trying to give an answer to this problem, a digital signal-processing method was already proposed by the authors; it avoids the use of a timing recovery circuitry, which strongly degrades the aforementioned accuracy. The method is here optimised with the aim both of further enhancing the accuracy on jitter estimates and testing, in an automatic way, jitter performance of network elements operating at the PDH bit rate of 140 Mbit/s and the SDH bit rate of 155 Mbit/s. In particular, an innovative procedure for automatically recovering the binary information conveyed by the jittered signal under analysis and a proper strategy for carrying out instantaneous jitter measurements at uniform time intervals are developed. After a brief outline of the old version of the method, the proposed modifications are described in detail. Then, the performance of the optimised method is assessed through many laboratory tests on emulated signals, the results of which are given and discussed. At the end, the outcomes of real automatic tests, conducted on PDH/SDH-based equipment produced by Marconi Sud S.p.A., are also presented.
Keywords:
jitter measurement, PDH networks, SDH networks, ITU-T recommendations, digital communication system quality assessment
Download:
IMEKO-TC4-2001-139.pdf
DOI:
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Event details
IMEKO TC:
TC4
Event name:
TC4 Symposium 2001
Title:

11th IMEKO TC4 Symposium on Trends in Electrical Measurements and Instrumentation (together with 6th IMEKO TC4 Workshop on ADC Modelling and Testing)

Place:
Lisbon, PORTUGAL
Time:
13 September 2001 - 14 September 2001
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