GL’s T1 E1 Jitter Measurement Software

Share Article

GL Communications Inc. conveyed today the availability of Jitter Measurement Software that allows accurate measurement of jitter associated with T1 or E1 signals.

Jitter Measurement Software

The Jitter Measurement module computes jitter by comparing the incoming signal against a much higher rate reference clock. The nominal clock signal (the "Clock Under Test" or "CUT") is recovered from the incoming data stream.

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 Jitter Measurement Software that allows accurate measurement of jitter associated with T1 or E1 signals.

Speaking to media persons, Mr. Vijay Kulkarni, CEO of the company said, ” GL's jitter measurement software 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. Jitter can also 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.”

He added, “The Jitter Measurement module computes jitter by comparing the incoming signal against a much higher rate reference clock. The nominal clock signal (the "Clock Under Test" or "CUT") is recovered from the incoming data stream. The number of reference clock ticks for each incoming nominal clock tick thus extracted is captured for analysis. Reference clock values are captured in blocks of 2048 consecutive measurements.”

Mr. Kulkarni further explained, “Clock deviations are grouped into ranges depending on the frequency of the cumulative jitter:

·Jitter: Small amplitude fast variations in clock pulses with frequency of variations above 10 Hz.
·Wander: Larger amplitude slow variations in clock pulses with frequency of variations below 10 Hz.

To these, GL Communications Inc. recognizes the following groupings:

·Drift: Very slow variations in a clock signal (below 1 Hz).

·Frequency Offset or Deviation: A permanent or steady state difference in clock rates. It will eventually result in either frame slips (bit insertions or deletions) or in loss of synchronization of network elements.”

He further added, “The above classifications are important because clock deviations in the various ranges present different problems for network equipment.”

Important features:

·Easy, accurate, visual pulse shape and jitter measurement for T1/E1 signals (only available with Universal T1/E1 cards and tProbe™ T1/E1 analyzer).

·Provides an option to select T1 or E1 port for monitoring and the frequency range of interest.

·Supports One-Shot capture and Repeated Capture options for jitter measurement.

·Jitter generation (coming soon)

About GL Communications Inc.,

Founded in 1986, GL Communications Inc. is a leading supplier of test, monitoring, and analysis equipment for TDM, Wireless, IP and VoIP networks. Unlike conventional test equipment, GL's test platforms provide visualization, capture, storage, and convenient features like portability, remotability, and scripting.

GL’s TDM Analysis & Emulation line of products includes T1, E1, T3, E3, OC-3, OC-12, STM-1, STM-4, analog four-wire, and analog two-wire interface cards, external portable pods, and complete system solutions. Capabilities include voiceband traffic analysis and emulation across all traffic types (voice, digits, tones, fax, modem), all protocols (ISDN, SS7, GR-303, Frame Relay, HDLC, V5.X, ATM, GSM, GPRS, LTE, etc.), and with capacities up to thousands of channels. Our newest products provide astonishing capacity and capture capability up to and including gigabit speeds.

GL’s VoIP and IP products generate / analyze thousands of calls and traffic simultaneously with traffic types such as frames, packets, voice files, digits, video, tones, noise, and fax. Almost all codecs are supported including G.711, G.729, AMR, EVRC-A,B,C, GSM, iSAC, and many more. Additional features include visual analysis, real-time listening, and recording. The product line also includes Ethernet / IP Testing capability that simulates and checks frame transport and throughput parameters of Ethernet and IP networks, including delay, errors and other impairments.

GL's Voice Quality Testing (VQT) product line complements all of GL's products. Using ITU-standard algorithms (PAMS, PSQM, and PESQ), GL's VQT provides a widely accepted solution for assessing voice quality in the telecom industry. Voice Quality Testing across multiple networks (T1, E1, T3, E3, OC-3, OC-12, VoIP, Wireless, and Landline) are all available.

GL’s Wireless Products perform protocol analysis and voice quality assessment on GSM, CDMA, UMTS, and LTE networks. Connections can be made to any wireless phone with automated call control, GPS mapping and real-time signal measurements.

GL’s Echo Canceller testing solutions provide the broadest range of simulation and analysis, including line and acoustic echo. GL’s compliance testing per G.168. G.167 and P.340 across TDM, IP, VoIP and Wireless networks is widely accepted in the industry.

GL’s wireless VQT solutions help assessing impairments to voice quality such as poor mobile phone quality, voice compression and decompression algorithms, delay, loss and gain in speech levels, noise, acoustic and landline echo, and other distortions are easily assessed and accurately measured.

GL’s Handheld data testers can test a wide variety of communications facilities and equipment including T1, fractional T1, E1, fractional E1, T3 and E3 modems, multiplexers, CSU, DSUs, T1 CSUs, DTUs, NTUs and TIUs and more. The testers provide convenience, economy, and portability for almost any interface, including RS232, RS-422, RS-530, X.21, T1, E1, T3, E3, and many others.

GL’s Network Surveillance and Monitoring products include Probes for TDM, IP, VoIP, ATM, and Wireless networks. An open standards based approach provides a scalable, feature rich, real-time access to network characteristics. Centralized or distributed access, efficient transport and database loading allow compatibility with 3rd party and standards based monitoring systems.

###

Share article on social media or email:

View article via:

Pdf Print

Contact Author

Mr.Shelley Sharma

Gururaj S D