d-Color MF4003/MF3303
P THEORY OF OPERATION > 8. FK-517
P-101
Bits (LSB-MSB) Value Meaning
17 0 Start bit
18 1 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 Pre-coding coefficient h (1) Real
68 0 Start bit
69-84 Pre-coding coefficient h (1) Imaginary
85 0 Start bit
86-101 Pre-coding coefficient h (2) Real
102 0 Start bit
103-118 Pre-coding coefficient h (2) Imaginary
119 0 Start bit
120-135 Pre-coding coefficient h (3) Real
136 0 Start bit
137-152 Pre-coding coefficient h (3) Imaginary
153 0 Start bit
154-169 Reserve
170 0 Start bit
171-186 CRC
187 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.
(7)Re-synchronization procedure / Startup procedure
• A procedure required to switch control channel and main channel in the half-duplex procedure
• A procedure which includes another modulation parameter exchanging is especially called the startup procedure. (used for changing the
communication speed)
(a)Startup procedure
• Control channel startup procedure (By exchanging MPh, the communication speed is changed.)
• “Control channel re-synchronization procedure” is not used.
(b)Re-synchronization procedure
• Control channel re-synchronization.
• See signals related to control channels for signal names and change method.
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