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One of the major advantages that SDH networks have over traditional PDH networks is the standardization of its technology. Before the advent of SDH, ITU-T O.171 existed for test equipment used in testing PDH systems. In the early days of SDH, ITU-T O.171 was also used as the basis for designing SDH test equipment. However, it wasn't until ITU-T O.172 was introduced that the ITU addressed test equipment specifications for testing SDH optical signals from 52 Mb/s to 2.5 Gb/s and for electrical signal rates of 52 Mb/s and 155 Mb/s. The objective of ITU-T O.172 is to
clearly define test equipment requirements for verifying,to
ITU-TG-series recommendations, that SDH network equipment: functions properly in the presence of defined (allowable) levels of jitter and/or wander does not generate excessive levels of jitter and/or wander The following key elements of ITU-T O.172 are used to establish test equipment standards: an input phase tolerance test for test equipment more preci

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