Black Box SHM-B ME800A Plus Network Short-haul Modem Model-B Async w/ AT Modem Cable ME800A-PLUS.Model Series: SHM-B PlusBlack Box Model Number: ME800A-PLUSAT Modem DB25M/DB9F Cable Part Number: EVMBMC-0006Features:The Short Haul Modem Model B Async Plus (SHM-B ASYNC) is an asynchronous full-duplex 4-wire line driver/receiver which allows two RS-232 devices to communicate at distances of up to 4 miles and at data speeds of up to 115.2 Kbps.Includes an AT Modem Cable, Premium-DB25M / DB9F• Interface: RS-232• Protocol: Asynchronous• Operation: 4-wire, Full Duplex, point-to-point• Line Interface: Balanced current loop; Receive lines are protected through optical isolators rated at 1500 volts.• Connectors: (1) DB25 Female connector; (1) 4-screw terminal block; (1) RJ11 (6 position) connector• Diagnostics: Loopbacks provided by a front-panel switch: Analog loopback on a 4-wire loop and digital loopback on equipment interface (EIA-232).• Status Indication: Two bi-color LED's indicate the status of the transmitter and receiver. A green light indicates a "low" logic level (-3 to -15V) on the232 interface; a red light indicates a "high" logic level (+3 to +15V).• Power: Power is supplied by a wall-mounted power transformer. - Primary 115VAC +/- 10%, 60 Hz, 5 watts - Primary 230VAC +/_ 10%, 50 Hz - Secondary: 17 VAC, 700 ma