GL Conveys the Availability of its Jitter Measurement and Pulse Mask Compliance Testing Solutions

Gaithersburg, MD (PRWEB) November 06, 2012

GL Communications Inc. a leader in providing PC-based test, analysis and simulation products and consulting services to the worldwide telecommunications industry, conveyed today the availability of its Jitter Measurement and Pulse Mask Compliance Testing solutions.

Speaking to media persons, Mr. Jagdish Vadalia CEO of the company said, GL’s jitter measurement software allows one to accurately measure jitter associated with T1 or E1 signals. Jitter is the time discrepancy between the time of arrival of a clock pulse and its theoretical arrival time. Jitter arises from a number of sources, including aging of clock circuits, thermal and loading effects, Doppler shifts, and de-multiplexing from higher bit rate data streams. Since no clock is perfect, all clocks exhibit some degree of jitter. Jitter is always computed by comparing a clock signal (called the “nominal clock” or the “clock under test”) with a clock having superior accuracy (called the “reference clock”).

He added, GL’s Jitter Measurement module allows evaluation of jitter on either a tick-by-tick or a cumulative basis. Technically, cumulative jitter is of primary importance, as network equipment must cope with the cumulative jitter. However, tick-by-tick measurements are also presented in this module. In addition to these, the application recognizes the very slow variations in a clock signal (below 1 Hz), and the Frequency Offset or Deviations in clock rates.

Jitter can be measured in terms of the time duration of a single clock pulse. This time interval is referred to as a “Unit Interval” or UI. For T1 systems operating at 1.544 Mbps, 1 UI equals 647 nanoseconds. For E1 systems operating at 2.048 Mbps, 1 UI equals 488 nanoseconds. UI durations for higher rate bit streams are proportionately smaller.

Mr. Vadalia further added, GLs tProbe T1 E1 Analyzer and Universal T1 E1 Cards have pulse shape measurement capability. Software has been developed to determine if the pulse shape fits within a pulse mask as specified by standards ITU G.703 and ANSI T1.102-1993. The software is available in both visual and tabular formats. Tabular formats are convenient for automation and scripted test environments. It is quite common for T1 E1 signals, within a central office environment or an enterprise telecom room, to NOT meet pulse mask requirements due to interference, too long or short cable lengths, improper impedances, or simply poor transmitter design. In such cases, pulse mask compliance is very useful in diagnosing problems.

Important Features of Jitter Measurement

GL Conveys the Availability of its Jitter Measurement and Pulse Mask Compliance Testing Solutions