Olivetti d-Color MF4003 Service Manual page 669

d-Color MF4003/MF3303
(a) Beginning of communications to beginning of 1st page transmission
Phase 2
Determination of the Modulation
Change and determination Mode for measuring line
of the V 8 communication characteristics, and then
ability and directions measurement
75 5 ms
Call
Terminal
L1
CNG CM CJ B B
Answer
Terminal
ANSam JM A A
75 5 ms
Network Interaction Line Probing
Note - The string of consecutive 1s shall be followed by the 4T of scrambled ones defined in 12.6.3/V34.
(b) Signals between pages
Source Terminal
Image
Data
Recipient Terminal
(c) 2nd page transmission termination to communication termination
Control channel re-synchronization procedure
Source Terminal
Image
Data
Recipient Terminal
Note - Some terminals may disconnect the line immediately after sending DCN without sending consecutive 1s.
(3) Procedure details
(a) Phase 1 (V8) ....Beginning of connection between a calling modem and a called modem
When ANSam / ANS is detected
(CI must be sent three times or more)
1 sec
CI,CI,CI(*1)
Calling
Called
0.2 sec or more
• *1: One of no signals / C1 / CNG (T.30) / CT (V.25)
• *2: V.34 full-duplex ability in the modulation mode bit is ON.
• *3: ANSam of phase inversion is sent. Phase inversion is an option in case of supporting only half-duplex. When CM or valid signal
from the calling side is not detected, the procedure is moved to T.30, etc. after 75 ± 5 ms interval.
Y119930-3
Control channel startup
Phase 3 (establishment) procedure
Training of equalizer (main channel speed determination, etc.)
70 5 ms 70 5 ms
L2 PPh ALT MPh MPh E Flags
B S S PP TRN
PPh ALT MPh MPh E NSF CSI DIS
A
Primary
Channel
Modern Parameter
Equalizer
Exchange
Training
Control channel re-synchronization procedure
ALT Flags
Sh Sh E
ALT Flags MCF
Sh Sh E
ALT E Flags
Sh Sh
ALT E
Flags
Sh Sh MCF
When JM is detected twice or more
0.5 sec or more
(echo canceler is OFF.)
Te
CM,CM,CM(*2)
ANSam (*3)
JM,JM,JM
5 1 sec or less
When CM is detected
twice or more
Main channel re-synchronization procedure
(establishment of main channel)
70 5 ms
Image
"1"
TSI DCS Flags S S PP
B1
Data
(Note)
CFR
Flags
Primary
Channel
T.30 Fax Handshaking
Resync.
Main channel re-synchronization procedure
Image
"1" S S PP B1
Data
Flags
DCN "1" Line Disconnect
Line Disconnect
Flags
75 5 ms
CJ To Phase 2
To Phase 2
75 5 ms
When CJ or Tone B is detected
P-95
P THEORY OF OPERATION > 8. FK-517
Service Manual