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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
5-8
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