06/2014
6-142
WC 5022/5024
6.8.5.2 V.8 CM/JM Signal
Version 1.0
General
Stops after the signal with amplitude of 2100Hz modulated by15Hz is being sent
continuously for 4sec, or once CM is detected. Fax without Super G3 capability is
detected as CED.
CM (Calling Menu Signal):
300bps signal (*) that declares the modem mode that can be used at outgoing termi-
nal.
JM (Joined Menu Signal):
Stops when 300bps signal, which declares the modem mode that can be used on
the outgoing/incoming terminal, and CJ are detected (For CM or JM FIF, refer to No.
2 'V.8 CM/JM Signal')
CJ (CM terminator):
Continuation of 300bps and 3 octet '0' by signals which indicate the end of CM and
verify JM.
NOTE2 Signal Names and Contents
V.34ph2 (Phase 2): Probing
Measures the line attribute using Probing signal.
V.34ph3 (Phase 3): Equalizer Training
Set up the modem equalizer by the TRN signal
V.34ph4 (Phase 4): Final Training
Determines the signal speed
(V.34 Phase 1 is V.8 procedure)
This section (Phase 2 to 4) is automatically performed by the modem at the outgoing and
incoming terminals. Send Level, Equalizer, and Modulator Speed are determined. The
value determined here takes precedence over the NSF/DIS contents.
6.8.5.2 V.8 CM/JM Signal
FIF configuration (Table 1) of CM and JM signals used in V.8 and the details of every bit are as
follows.
V.8 is the standard that decides the procedure for modem with multiple capabilities to auto
select the optimal mode corresponding to the line condition.
Figure 1 j0mf2717
To Next Page
Loading...
