Motorola MVME712B - Manual (Page 70)

Technical Specifications
MVME712A/D3 A-3
A
Technical Specifications
Table A-2 lists the technical specifications of the manual and Table A-3 lists
the characteristics of the Autodialer.
Table A-2. Technical Specifications
Characteristic SpeciÞcation
Operating mode Full duplex on 2-wire PSTN.
Data rates Low speed: 0-300 and 600 bps asynchronous.
Medium speed: 1200 bps (+1%, -2.5%),
character asynchronous and synchronous.
High speed: 2400 bps (+1%, -2.5%),
character asynchronous and synchronous.
Modulation Low speed: Frequency Shift Keying (FSK).
Medium speed: Differentially Coherent Phase Shift
Keying (DPSK).
High speed: Quadrature Amplitude
Modulation (QAM).
Compatibility WECO 103, 113, 212A, CCITT V.22, and
CCITT V.22 bis modems.
Digital interface TTL/CMOS.
Transmit carrier frequency Originate Answer
Low Speed: Mark: 1270 Hz 2225 Hz
Space:1070 Hz 2025 Hz
Medium speed: 1200 Hz 2400 Hz
High speed: 1200 Hz 2400 Hz
Transmitter output level Permissive (-10.5 dBm +/- 1.5 dB).
Line impedance 600 Ohm +/- 10%, transformer coupled.
Line protection Lightning and transient protection.
Receiver dynamic range -10 dBm to -45 dBm.
Carrier detect hysteresis No less than 2 dB.
Clamping Mark hold upon loss of carrier.
Line disconnect Abort timer (30 seconds, adjustable).
Loss of carrier (1.4 seconds, adjustable).
DTR disconnect (80 ms after DTR is dropped).
Scrambling/descrambling of
data bits High speed only: self synchronizing using
polynomial (1 + X-14 + X-17) per CCITT v.22.
DTE connector 20-pin double row header.