d-Color MF4003/MF3303
P THEORY OF OPERATION > 8. FK-517
P-100
Signal which sends alternately a point which rotated 0 point counterclockwise by 180 degrees and a point which rotated 0 point
counterclockwise by 270 degrees
PP
Special signal which is sent from a remote station for adjusting an equalizer
TRN
Training signal. (Symbol rate and duration are determined in INFOh.)
(a) Control channel signal
• The following signals are used for establishing the control channel or re-synchronization and retrain. (peculiar to half-duplex procedure)
Modulation
method
1200 / 2400 bps QAM modulation (600 ± 0.01
symbols / sec). However, training and synchronous
signals are 1200 bps.
• Calling modem: Carrier (=1200 Hz ± 0.01 % (level = set value))
• Called modem: Carrier (=2400 Hz ± 0.01 % (level = set value-1
dB)) + Guard tone (=1800 Hz ± 0.01 % (level = set value-7 dB))
Sh
Signal which sends alternately 0 point and a point which rotated 0 point counterclockwise by 90 degrees (the same as S)
Signal which sends alternately a point which rotated 0 point counterclockwise by 180 degrees and a point which rotated 0
point counterclockwise by 270 degrees (the same as S)
AC
Signal which send alternately 0 point and a point which rotated 0 point by 180 degrees
PPh
Special signal which is sent from a remote station for adjusting an equalizer (used when the initial of the control channel and
re-synchronization are executed)
ALT
Signal which scrambled alternate signals of 0 and 1 (1200 bps)
MPh
Binary signal used for exchanging parameters of the
modulation method when data is actually sent and
received by using the main channel (1200 bps)
• Both type 0 and type 1 (type 0+pre-recording coefficient) must
be received.
• When type 0 is received, pre-recording coefficient is considered
to be 0 and never functions.
E
“1”, binary of 20 bit, which represents the beginning of user data transmission on the control channel
(b) MPh (type 0) bit assignment
Bits (LSB-MSB)
Value
Meaning
0-16
All bit 1
Bit string for frame synchronization
17
0
Start bit
18
0
MP signal type
19
0
Reserved
20-23
1 to 14
Maximum transmission rate from the calling modem to the called modem (x 2400) *1
24-26
0,0,0
Reserved
27
0/1
Control channel data transmission rate
which is selected by the opposed
transmitter
• 0: 1200 bps
• 1: 2400 bps
28
0
Reserved
29-30
Trellis coding device selection *2
• 00: 16 state
• 10: 32 state
• 01: 64 state
• 11: Reserved
31
0/1
Non-linear encoder parameter selection
for the terminal transmitter of a remote
station *2
• 0:
φ
=0
• 1:
φ
=0.3125
32
0/1
Parameter (shaping) selection when the
data rate is determined within each
symbol rate *2
• 0: Minimum
• 1: Expanded
33
0
Reserved
34
0
Start bit
35-49
Communication speed mask (Bit
35=2400 bps ... Bit 46=28.8 kbps, Bit
47=31.2 kbps, Bit 48=33.6 kbps and Bit
49=Reserved)
• 0: Ability of both modems disabled
• 1: Enabled
50
0/1
Use of control channel imbalance data
rate
• 0: No
• 1: Yes
51
0
Start bit
52-67
0
Reserved
68
0
Start bit
69-84
CRC
85-87
0,0,0
Fill Bits
• *1: 13 and 14 are used when the opposed modem supports up to 1664 points.
• *2: Set to 0 on the transmitting modem.
(c) MPh (type 1) bit assignment
Bits (LSB-MSB)
Value
Meaning
0-16
All bit 1
Bit string for frame synchronization
Service Manual
Y119930-3
Summary of Contents for d-Color MF 4003
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