The T1-LITE® transmission test set is an extremely light weight, hand-held T1 transmission test set designed for quick, but thorough, T1 circuit testing for installation, maintenance, or service verification. It can be powered from a 115/230 VAC battery eliminator/charger or from a set of internal rechargeable nickel cadmium batteries. The T1-LITE is designed to be set up quickly and has the following characteristics: a. Autoconfigures to the line code, framing, and test pattern b. Generates standard loopback commands to control far end devices c. Transmits nine standard industry T1 test patterns plus digital milliwatt and voice data d. Sets AB or ABCD signaling bits e. Allows aural monitoring of T1 line or DS0 channel data through a front panel speaker or headset jack f. Using thirteen front panel LEDs, automatically displays the presence of pulses, frame and pattern synchronization, presence of B8ZS codes, signal loss, ALL1’s, low ones density, bipolar violations (BPV), errors present, presence of yellow alarm, DS1 idle signal, and excess zeros g. LCD display shows: error summary, BPV errors, bit errors, frame errors, CRC errors, error free seconds, errored seconds, receive frequency, T1 receive level, channel frequency and level, channel number and data, status of signaling bits, clock slips, frame slips, and elapsed time.