Toshiba DP120F Service Manual page 582

b-3) Equalizer and echo canceller training (Phase 3)
To optimize the filters such as an equalizer, the training (adjustment) is performed
according to the parameters set in phase 2.
• Transmitter
Signal name
S signal
S signal
PP signal
TRN signal
b-4) Final training (Phase 4)
The settings such as the maximum value for the data rate, selection of the trellis
encoder, and data rate which can be supported, are made.
• Calling/receivers
Signal name
PPh signal
ALT signal
Modulation
parameter
E sequence
DP120F/DP125F Dialing and Communication Procedure
Abbreviation
S Short training
S
PP The modem of receiver uses it for
training the equalizer.
TRN It is used for determining the trans-
mission rate by the receiver.
Abbreviation
PPh The modem of other unit uses it
for training the equalizer.
ALT
MPh It indicates the parameters used
for image transmission such as the
maximum data signaling rate, type
of trellis coding, and type of pre-
coding.
E
Meaning
Meaning
——
——
9-18
Remark
S is a signal that makes a
transition from phase S.
Remark
20-bit sequence of "1"s in bi-
nary
March 2000 © TOSHIBA TEC