Performance parameter · Line transmission rate: 300, 600, 1200BPS · Terminal speed: maximum 115.2KBPS · Modulation mode: binary frequency shift keying (FSK) · Transmission mode: synchronous/asynchronous · Transmission line: dedicated line, telephone line, voice channel of microwave, carrier, spread spectrum and optical fiber · Send and receive level: send 0 to -20db continuously adjustable; Receive