ET2148 G.703 Circuit Tester
- Speed 2.048Mb/s - G703 Interface
- Network Loop functions
- BERT (PRP15) generator/checker
- Master and Slave Timing options
- Adjustable Sensitivity: 0 to -12 or -43dB
- BPV detection / counter
- 75W or 120W matching options
- Battery powered - typically 8 hours
The ET2148 is a sophisticated handheld G.703 circuit tester capable of identifying a wide variety of circuit conditions, yet is extremely easy to use.
Its main function is test the integrity of a link by the transmission and reception of a specific test pattern. The tester checks the incoming data for errors and the total number of errors detected is displayed on the LCD display.
In order to facilitate this checking procedure, the tester can envoke / release loopbacks in both local and remote equipment capable of responding to the defined data sequences.
Network Loopbacks
To enable a loopback the tester sends a ‘00001’ pattern repeatedly for 8 seconds.
To disable a loopback the tester sends a ‘001’ pattern repeatedly for 8 seconds
Line Status
The line is checked for a valid HDB3 line signals, this being shown as a green for valid HDB3 signalling or red for no HDB3 signals. Line errors (Bipolar violations or BPVs) are also indicated by flashes of yellow.
When PRP15 test pattern is not selected, the LCD display will automatically count and log the number of BPVs received.
G.703 line Bit Error Rate Test (BERT)
This provides a means of testing circuits with an unframed data pattern. This test may be run either end-to-end, using a pair of testers, or with a remote loop, using a single tester. With the switch in BERT mode, the tester initially transmits continuous HDB3 zeros until valid incoming carrier is detected .The ET2048 then generates the standard unframed PRP-15 test pattern (215-1 pseudo-random bit sequence), and can generate on command either single bit errors or a steady stream of errors at a rate of E-6 (2 errors per second). It will then check the received PCM signals for the presence of the PRP15 pattern-green LED indicates synchronisation and a yellow indicates bit errors
The user can select either Master or Slave timing options for the BERT test allowing the tester to operate over a wide range of network configurations.
Other data patterns can be generated to aid further testing, these include the transmission of all 1s, all 0s and alternating 1s and 0s.
ET2148 G.703 Circuit Tester Specification
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