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Analysis (T1/E1/T3/OC-3/STM-1)
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Hand Portable Test Instruments
Overview
The GL’s 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, 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.
Main Features
- Tests asynchronous, 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
- In the sync mode, it also displays TX frequency, RX frequency, CTS delay, G.821 measurements and more
Testing an Async Terminal / Modem
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 |
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.
Buyer's Guide
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