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The HP 37743A is a DS3 test set with built-in multiplexer and demultiplexer to DSL. It offers both in-service and out-of-service tests. Front-panel LEDs give the status of the circuit at a glance. C-bit parity is included for testing the most modern links. A large range of patterns helps find the more difficult faults and analysis gives a measure of long-term performance. Measurements: Bit, code, parity, frame, C-parity, FEBE. DS3 Alarm LEDs: Loss of signal, code error, parity error, frame error, frame loss, bit error, pattern loss, AIS, idle, X-bit. At DS1: CRC and frame errors. DS1 Alarm LEDs: Frame error, CRC error, frame loss, yellow alarm, AIS, ESF.
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