Service manual

UX-22oocMu/cMC
Fo-215OCMU/CMc
(4) Modem (Rl44EFXL) block
INTRODUCTION
The Rockwell R144EFXL MONOFAX modem is a synchronous 14400
bits per second (bps) half-duplex modem with error detection and DTMF
reception. It has low power consumption and requires only a single +5V
DC power supply. The modem is housed in a single VLSI device pack-
age.
The modem can operate over the public switched telephone network
(PSTN) through line terminations provided by a data access arrange-
ment (DAA).
The R144EFXL is designed for use in Group 3 facsimile ma-chines.
The modem satisfies the requirements specified in CCITT recommen-
dations V.29, V.27 ter, V.21 Channel 2 and T.4, and meets the binary
signaling requirements of T.30.
The modem can operate at 14400,9600,7200,46W, 2400, or 300 bps,
and also includes the V.27 ter short training sequence option.
The modem can also perform HDLC framing according to T.30 at 14400,
9606,7200,4660,2400, or 300 bps.
The modem features a programmable DTMF receiver and three pro-
grammable tone detectors which operate concurrently with the V.21
channel 2 receiver.
The voice mode allows the host computer to efficiently transmit and
receive audio signals and messages.
The modem is available in either a loo-pin plastic quad flat pack (PQFP)
or a 64-pin quad in-line package (QUIP).
General purpose input/output (GPIO) pins are available for host as
signment in the 1 W-pin PQFP.
The modem’s small size, single voltage supply, and low power con-
sumption allow the design of compact system enclosures for use in both
office and home environments.
MONOFAX is a registered trademark of Rockwell International.
FEATURES
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Group 3 facsimile transmission/reception
- ITU-TS V.29, V27 ter, T.30, V.21 Channel 2, T.4
- HDLC Framing at all speeds
V.27 ter short train
Concurrent DTMF, FSK, and tone reception
Voice mode transmission/reception
Half-duplex (a-wire)
Programmable maximum transmit level:
0 dBm to -15 dBm
Programmable transmit analog attenuation:
OdBto14dBin2dBsteps
Receive dynamic range: 0 dBm to -43 dBm
Programmable dual tone generation
Programmable tone detection
Programmable turn-on and turn-off thresholds
Programmable interface memory interrupt
Diagnostic capability
-Allows telephone line quality monitoring
Equalization
-Automatic adaptive equalizer
- Fixed digital compromise equalizer
DTE interface: two alternate ports
- Selectable microprocessor bus (6500 or 6065)
- CCllT V.24 (EIA-232-D compatible) interface
TTL and CMOS compatible
Low power consumption: 275 mW (typical)
Single Package
- 1 W-pin PQFP
-64-pin QUIP
Single +5VDC power supply
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