Motorola MVME712B Manual De Usuario
Technical Specifications
MVME712A/D3
A-3
A
Technical Specifications
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.
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).
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.
CCITT V.22 bis modems.
Digital interface
TTL/CMOS.
Transmit carrier frequency
Originate Answer
Low Speed: Mark: 1270 Hz 2225 Hz
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).
Loss of carrier (1.4 seconds, adjustable).
DTR disconnect (80 ms after DTR is dropped).
Scrambling/descrambling of
data bits
data bits
High speed only: self synchronizing using
polynomial (1 + X-14 + X-17) per CCITT v.22.
polynomial (1 + X-14 + X-17) per CCITT v.22.
DTE connector
20-pin double row header.