GL Conveys the Availability of its T1 E1 Error Insertion and Bulk Delay Application

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GL Communications Inc. conveyed today the availability of its T1 E1 Error Insertion and Bulk Delay Application.

T1 E1 Error Insertion

The Error insertion application permits inserting single, fixed, automatic, random, and burst error into the incoming bit stream. Bulk delay is an added feature in Error insertion application, that allows users to apply delay on the entire T1 E1 trunk.

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 T1 E1 Error Insertion and Bulk Delay Application.

Speaking to media persons, Mr. Vijay Kulkarni CEO of the company said, ” Simulating bulk delay and errors like that found in real networks can help optimize the performance of applications. GL's USB based or PCI Card based T1 E1 Analyzers can easily simulate such conditions. For example: At what delay does the application under test suffer throughput degradation due to ARQ – Automatic Repeat Requests, at what error rates does voice performance on compressed codec circuits start to degrade, how good is error correction when the underlying uncorrected error rate is 10E-5, how to simulate the error characteristics of a microwave circuit, a copper T1 line, a fiber optic transmission line, Does encryption multiply the inherent error rate of the circuit and by how much and so on..”

He explained, ” The Error insertion application permits inserting single, fixed, automatic, random, and burst error into the incoming bit stream. A block diagram, GUI, and schematic of the function is provided for Error Insertion application, ensure that the analyzers framing format configuration should be set according to the input signal framing format. As shown in the diagram the input to the T1 Card is fed back to the output after passing through the error insertion logic. When the aforementioned feature is used in conjunction with “Cross Port Transmit”, introducing delays and errors is extremely easy.

In the Cross Port Transmit Mode, the data that would normally be transmitted on Card 1 (Port 1) is diverted and transmitted on Card 2 (Port 2) and the data that would normally be transmitted on Card 2 (Port 2) is diverted and transmitted on Card 1 (Port 1). The receive paths are completely unaffected. This feature also eliminates complex cabling.”

Mr. Kulkarni further explained, “Bulk delay is an added feature in Error insertion application, that allows users to apply delay on the entire T1 E1 trunk (full multi-frame) of 1.544Mbps (T1) pipe or 2.048 Mbps (E1) pipe. This helps to simulate network delay along the T1E1 links. After selecting or adjusting the delay, the Delay will fill a buffer and begin transmitting the signal; this will cause the T1 or E1 multi-frame signal to briefly lose sync when applying the delay.”

He added, “Bulk delay can be applied in either microseconds or milliseconds units and delay can be varied from 0 to 169.77mSec or 69 to 169845 µSec for T1 and 0 to 127.99mSec or 46 to 128042µSec for E1 with an accuracy of ±10µSec. And the delay resolution is based on the byte increments of T1 or E1 (8 bits at a time) The bulk delay inserted can be verified using the Precision Delay Measurement application.

The user can either enter the required delay value manually or can adjust the slider to choose the delay value. To observe the delay set, in the precision measurement window as shown in the screen below the user has to check the Enable Bulk Delay check box.

The Precision Measurement window displays default delay difference of 0.04 for E1 card and 0.06 for T1 cards. And the delay set by the user using the Error Insertion application can be observed in the Precision Delay Measurement application.”

The following functions are permitted by GL’s Bulk Delay and Error Insertion application:

·Timeslot specific error insertion

·Manual Fixed Error Insertions can be inserted for T1/E1:

.    BPVs
.    Logic Errors
.    Frame Errors
.    CRC Errors
.    FDL Errors

· Automated Fixed or Random Errors can be inserted at a rate ranging from:

.    BPVs 10E-4 to 10E-9
.    Logic Errors 10E-2 to 10E-9
.    Frame Errors 10E-2 to 10E-9
.    CRC Errors 10E-9 to 10E-2
.    FDL Errors 10E-9 to 10E-2

·Bulk Delay in microseconds to over a hundred milliseconds; Delay can be varied from 0 to 169.77mS (T1) or 127.99mS (E1) with an accuracy of ± 10uS

·The bulk delay range is 0 -127ms, additional delay can be applied by other software based applications such as the Delay / Attenuate application

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) is 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

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.

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