Xerox 3210 - workcentre b/w laser, Service Manual

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WorkCentre 3210/3220 Multifunction Printer Service Manual 2-29
Theory of Operation
Fax
Fax is implemented by a conexant DAA (Data Access Arrangement) solution
and is roughly composed of two kinds:
■
CX86710 (SFX336)): A modem chip which adds SSD (System Side
Device) for interfacing between LSD and DIB of FM336Plus Core.
■
CX20493 (LSD): LIU (Line Interface Unit) chip controlled by SSD and
satisfies each PSTN requirements by modulating internal configuration
with connecting telephone line.
Modem (SFX336) Specification
■
2-wire half-duplex fax modem modes with send and receive data rates up
to 33,600 bps
■
V.17, V.34, V.29, V.27 ter, and V.21 Channel 2
■
Short train option in V.17 and V.27 ter
■
PSTN Session Starting: V.8 and V.8b is signaling
■
HDLC support at all speeds
■
Flag generation, 0-bit stuffing, ITU CRC-16 or CRC-32 calculation
and generation
■
Flag detection, 0-bit deletion, ITU CRC-16 or CRC-32 check sum
error detection
■
FSK flag pattern detection during high-speed receiving
■
Tone modes and features
■
Programmable single or dual tone generation
■
DTMF receiver
■
Tone detection with three programmable tone detectors
■
Receive dynamic range
■
0 dBm to -43 dBm for V.17, V.29, V.27 ter and V.21 Channel 2
■
9 dBm to -43 dBm for V.34 half-duplex
■
Digital speaker output to monitor received signal
s 3210mfp-143
Modem
CX86710( S FX336)
D S P SS D
S y s tem
S ide
Device
T r a ns fo r me r
T r a ns fo r me r
CX20493
L S D
Li n e
S ide
Device
Tel Li n e
Ext Li n e
LIU
S DAA
S o un d O u tp u t
MC14051BD
Vol u me/Keyclick
Co n t r ol
MC34119DR2
S peake r
D r ive r