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The HP 37721A digital transmission analyzer is a portable, lightweight, rugged test set providing bit, code, and FAS error testing at the European CEPT rates of 704 kb/s, 2, 8, 34, and 140 Mb/s. It measures error performance to CCITT Recommendation 0.821, with interfaces to 0.703. A key feature of the HP 37721A is its ease of use: the autosetup facility automatically configures the test set to the incoming data; nine stored setups ensure that required test parameters are instantly available; graphic display of res ults shows error counts, error seconds, and alarms at a glance; and a range of logging options to an internal or external printer provides customized hard-copy proof of results. Option 001 provides remote control via RS-232 and HP-IB interfaces and adds the ability to log results to an HPThinklet. Multiple outputs in Option 002 enable simultaneous loading of four channels of a multiplexer or digital radio with only one test set. With Option 003, up to 100 ppm of frequency offset is provided at all rates to evaluate clock-recovery circuits. Option 004 provides binary TTL/ECL interfaces with external clock input for telecom and general purpose applications. Option 005 fully checks frame signals in-service at 140, 34, 8, and 2 Mb/s.
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