GL Communications Inc.
 
 
 
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LinkTest™ Single


Overview

The GLs LinkTest™ SINGLE is a sophisticated bit error rate tester in a compact, hand held package. The unit can test a wide variety of communications facilities and equipment including Asynchronous (full-duplex and half-duplex), Synchronous, T1, fractional T1, E1, fractional E1, modems, multiplexers, CSU/DSUs, T1 ESF CSUs, DU, NTUs and TIUs. The LinkTest™ SINGLE is supplied with V.35, RS232, RS422/RS530, X.21, DS1 (T1, 1.544 Mbps) and G.703 (E1, 2.048 Mbps) interfaces. The tester is supplied with a wall-mounted AC transformer.

 
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Main Features

  • Tests asynchronous (full-duplex and half-duplex), synchronous, T1 and fractional T1, E1 and fractional E1 facilities and equipment
  • Interfaces V.35, RS232, RS422/RS530, X.21, T1 E1
  • Data rates from 50 bps to 10 Mbps
  • Built-in speaker for monitoring DS0s or timeslots
  • Displays G.821 performance measurements
  • Terminate and monitor modes
  • Controlled from the front panel, VT100 console, or command line interface
  • Works with AC or battery power

Applications

The LinkTest™ SINGLE is designed to fulfill the requirements of a broad range of applications that may be used to test data communications equipment, networks, systems and line facilities. It simulates real data passing through a data communications link, and then determines the performance of a piece of equipment or that of a network. Many standard data patterns may be generated and recovered. The LinkTest™ SINGLE can then monitor the data passing through the data communications link, and indicate line quality by comparing the data with the received data that was known to have been transmitted.

Typical applications include,

  • Final test departments
  • Field installations of data communications equipment
  • Field evaluations of data communications equipment
  • Field monitoring of data communications facilities
  • Field problem isolation

LinkTest™ SINGLE can test:

  • Async Mode - Tests asynchronous modems and CRT terminals
  • Sync Mode - Tests the customer interface on DDS, T1 and T3 CSU/DSUs, mux channels and synchronous modems
  • T1 Mode Tests T1 lines, CSU/DSUs both short and long haul, T1 mux and drops from T3 mux
  • E1 Mode Tests E1 lines, NTUs and DTUs, E1 mux and drops from T3 E3 mux

Figure - A LinkTest™ SINGLE testing a telephone line and a pair of modems, the remote modem is in loopback

Figure - A pair of LinkTest™ SINGLE testing a telephone line and a pair of modems

T1 and E1 Testing

  • Displays Bit errors
  • Transmit and receive frequency
  • Test seconds, bit error rate and G.821 performance measurements (erred seconds, severely erred seconds, degraded minutes and available and unavailable times)
  • A variety of test patterns can be inserted in all or selected time slots/DS0s, continuous or non-contiguous, making the Tester ideal for fractional T1 and E1 testing
  • In the T1 mode it also displays receive level

T1 testing using Monitor

E1 testing in Terminate

Asynchronous and Synchronous Testing

In addition to T1 and E1, the LinkTest™ SINGLE provides asynchronous and synchronous test modes.

  • Generates test data in a choice of patterns and formats
  • Users can choose from twenty-eight async and seventy-five sync test speeds
  • Displays bit errors, bit error rate, and total test seconds
  • In the async mode, it also displays characters received, character errors and erred seconds
  • Async mode is configured to send BERT in full-duplex & half-duplex modes
  • In the sync mode, it also displays TX frequency, RX frequency, CTS delay, G.821 measurements and more

Testing an Async Terminal / Modem

Testing for Async Terminal / Modem in Half-duplex operation

Testing a T1 facility with CSU/DSUs and V.35 interfaces (Sync)


Specifications

Async

Speed 50 to 115,000 bps
Displays Character Errors, Characters Received, Total Test Seconds, Erred Seconds, Round Trip Delay and Elapsed Time
LEDS Pattern Lock, Pattern Recovered, TXD, RXD, RTS, CTS, DSR, CD, and DTR
Patterns 2^9 (511), 2^11 (2047), Binary, Fox Test, Mark, Space and Round Trip Delay
Loops Self-Test
Interfaces V.35, RS530, RS422 and RS232 Physical: DB 25 pin Female

Sync

Speed 1,200 to 50,000,000 bps
Displays Bit Errors, Bit Error Rate, Test Secs, Erred Secs, Severely Erred Secs, Degraded Mins, Available, Unavailable, RX Freq, TX Freq, Bits Received, RTS Time, Round Trip Delay and Elapsed Time
LEDS Pattern Lock, Pattern Recovered, Transmit Data, Receive Data, RTS (C), CTS, DSR, CD (I), DTR, TXC, RXC (S), and External TXC
Patterns 2^9 (511), 2^11 (2047), 2^15, ITU 2^15, QRSS, 2^20, ITU 2^20, 2^23, ITU 2^23, 1 of 8, 3 of 24, Alt, Mark, Space and Round Trip Delay
Loops Self-Test and V.54
Interfaces V.35/DB25, RS530/DB25, RS422/DB25, RS232/DB25, and X.21/DB15 pin

T1

Speed 1,544,000 bps
Displays Bit Errors, Bit Error Rate, Test Secs, Erred Secs, Severely Erred Secs, Degraded Mins, Available, Unavailable, RX Freq, TX Freq, Signaling Bits, Density Errs, Frame Errs, CRC Error, BPV Error, RX Level Volts & dB, Slips, Round Trip Delay
LEDS Pattern Lock, Pattern Recovered, Frame Lock, AIS (Blue), RLOS, CRC Error, BPV, D4, ESF, AMI, B8ZS and Yellow
Patterns 2^9 (511), 2^11 (2047), 2^15, ITU 2^15, QRSS, 2^20, ITU 2^20, 2^23, ITU 2^23, 1 of 8, 3 of 24, T1 DALY, T1 DALY UF, 55 Octet, 55 Octet UF, Alt, Mark, Space , Digimwatt, User 3 - 32, Round Trip Delay, DDS OCU Loop, DDS CSU Loop and DDS DSU Loop
Loops Self-Test, ATT Loop U/D, ANSI Loop U/D, ATT Payload, ANSI Payload, Smart Jack 1 & 2 (Framed & Unframed) and V.54
Speaker Monitors selected TX or RX DS0 for voice
Interfaces DS1 BiPolar, 110 Ohm, AMI/B8ZS Coding
Physical RJ48C and Dual Bantam

E1

Speed 2,048,000 bps
Displays Bit Errors, Bit Error Rate, Test Secs, Erred Secs, Severely Erred Secs, Degraded Mins, Available, Unavailable, RX Freq, TX Freq, Slips, CRC Errs, BPV Errs and Frame Errors
LEDS Pattern Lock, Pattern Recovered, Frame Lock, AIS (Blue), RLOS, CRC Error, BPV, DMFA and RRA
Patterns 2^9 (511), 2^11 (2047), 2^15, ITU 2^15, QRSS, 2^20, ITU 2^20, 2^23, ITU 2^23, 1 of 8, 3 of 24, Alt, Mark, Space, Digimwatt and User 3 32
Loops Self-Test and V.54
Speaker Monitors selected TX or RX timeslot for voice
Interfaces G.703/704, 75 & 120 Ohm, HDB3 Coding
Physical Dual Bantam, Dual BNC and RJ48C

Unit Specifications

Switches

Ten momentary pushbuttons:
Mode
Display (Up button and Down button)
Configure (Up button and Down button)
Change (Up button and Down button)
Send (Loop and Error)
Test (Start)

Console Part

RS232 interface with speed of 9600 bps with 8 data bits, 1 stop and no parity
Supports dial-in modems
Control "D" used for disconnect

Power

North America Wall-mount power supply
90 130 VAC
Internationally Switching Mode - inline
100 to 240 VAC, 50 to 60 Hz
8 AA Nickel Metal Hydride Batteries
6 Watts, 21 BTU/hr

Environmental

Operating Temperature 0 to 50 degrees C, 32 to 122 F
Relative Humidity 0% to 95%, non-condensing

Physical Dimensions

Dimension 5" (12.7 cm) H x 7" (17.8 cm) W x 2" (5.1 cm) D
Weight 1 lb (.45 kg)

Specifications subject to change without notice.


Application Notes


Buyer's Guide

Item No. Item Description
LTS001 LinkTest™ SINGLE
Hand Portable Single T1 E1 Test Set
   
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