This multi-function instrument performs DS-1 and DS-3 PCM testing, analog TMS and signaling analysis and jitter analysis. Set is configured by selecting from option cards for six option slots available. (See below) BASIC DS-1: The starter unit has two DS-1 transmitters and receivers for monitor, terminal or drop and insert functions and 24 channel signaling monitor. Performance monitoring of 10 conditions specified in G.821.ESF, SLC-96 and DACS compatible. Talk/dial/hold capable. Monitor speaker. Dials in DP, DTMF, MF. Sends 404,1004, 2804 and 2713. Back-lit display, 4 X 40. Remote operation. Printer port. External clock access. Bantam and 310 jacks. AC powered. Weight 16 lbs.