Table of Contents
Advertisement
Field Service Ver. 7.0 Jan. 2009
Signal type
Meaning
CM
Modulation
(Call Menu)
mode etc.
on the calling
side
[Comments]
• CM is a signal which carries call function, modulation modes, protocols and GSTN
access.
• The first information category is call function.
• Protocols and GSTN access category are added when the calling side has ability
and when needed to inform to a remote station.
CJ
CM
termination
[Comments]
• START bit (0) and STOP bit (1) are added to 1 octet of all bit 0.
• Signal format START bit b0 b1 b2 b3 b4 b5 b6 b7 STOP bit.
JM
Display of
(Joint Menu)
common
ability on
both calling
and called
sides
[Comments]
• JM is a response signal to CM and of the same format as the received CM.
• The fist information category is Call Function as same as CM.
• Modulation mode sets the common bit on calling and called sides and sends by
the same octet as received CM.
• When there is no common ability, all bits are set to 0 and send by the same octet
as received CM.
• The minimum item No. is selected from the common bits to determine the actual
Modulation Mode.
• Protocol is added when it is included in received CM and needed to instruct.
• GSTN access is added when it is included in received CM and needed to instruct.
• Bit 6 is set to ON when needed to show ability. Bit 5 is set to the same one as
received CM
Y104784-2
Signal direction
Signal
call called
speed
V.21(L)
(300 bps)
V.21(L)
(300 bps)
0
0
0
V.21(H)
(300 bps)
Service Manual
2. COMMUNICATION CONTROL
Timing of transmission
Start: Te (0.5 sec.
Te
passed after CI transmission
stops
Stop: When two or more JM are
detected
When CM is completed
0
0 0
0
0 0
1
Start: When two or more same CM are
received
Stop: When CJ is received or receives a
signal matching the selected
Modulation Mode from the calling
side
1 sec.) has
35
Advertisement
Table of Contents
