03/02
Level 2 Troubleshooting
WorkCentre Pro 423/428
2-107
CHAPTER 2 TROUBLESHOOTING
2.3.3.2 V.8 CM/JM signal
Table 1 shows the FIF configuration of the CM and JM signals used in V.8. For the details of
each bit, see below.
The V.8 standard prescribes a procedure for a modem of multiple capabilities to select
optimum mode automatically according to the line status.
Table 2: information category
Table 1: CM/JM FIF
configuration
preamble
Call function
Modu. mode oct1
Modu. mode oct2
Modu. mode oct3
Protocol
*
GSTN access
*
X
1
X X
0
0
1
0
X
0
X X
0
1
0
1
X
1
X X
0
1
1
0
GSTN(General public line) access
Call function
Modulation mode
Protocol
The preamble and items under it are called information categories. Bits 0 to 4
are tags indicating categories and their contents are fixed. (Table 2)
*
The octets of the Protocol and GSTN Access categories may not exist.
b7 b6 b5 b4 b3 b2 b1 b0
X
1
X X
0
0
0
0
Terminal info.
Modu.mode
preamble
b7 b6 b5 b4 b3 b2 b1 b0
1
0
1
1
0
0
0
0
Call function
X X X
1
0
0
0
0
100: Transmission from calling terminal 101: Reception by calling terminal
110: Data transmission and reception
111: Display by extended octet
X
X
0
1
0
0
1
0
1:V.34 full duplex
Reserved (Set 0)
X
X
X
0
1
0
X
X
Extended octet
1:V.22
1:V.32
X
X
X
0
1
0
X
X
1:V.23 half duplex
Extended octet
1:V.23 full duplex
1:V.26bis
1:V.26ter
-
Priority
-
If the priority is 1 for
two or more modulation
modes, the mode having
the smallest item
number in the square at
right is used.
…V/34 full duplex" has
the top priority.
X
0
X X
0
1
0
Protocol
001:V.24LAPM protocol
111:
Protocol displayed by extended octet
0
1
X
X
0
1
1
0
GSTN access
Reserved (Set 0)
1:
Cellular connection on termination
side
1: Cellular connection on origination side
Modu.mode
Modu. Mode
RFW
Call function category tag
Modulation Mode category tag
Protocol category tag
GSTN access category tag
The priority is 1 for the
modes whose
explanations are in
dotted line squares
because they are used
for fax.
2
1
7
6
5
4
3
12
11
10
9
8
&0-0
synchronous signal
(K
Info.categorys
1:V.21(300bps)
1:V.17(14.4K bps)
1:V.29(9600bps)
1:V.27ter(4800bps)
:V.34 half dup(28.8K bps)
Terminal info.
0
0
1
1
1
1
1
1
End of data 7Eh
Summary of Contents for WorkCentre Pro 423
Page 2: ......
Page 3: ...WorkCentre Pro 423 428 6HUYLFH 0DQXDO...
Page 6: ......
Page 8: ......
Page 9: ...INTRODUCTION...
Page 10: ......
Page 24: ...WorkCentre 423 428 03 02 INTRODUCTION 14 7 Translation of Warnings...
Page 25: ...CHAPTER 1 SERVICE CALL PROCEDURE...
Page 26: ......
Page 28: ...WorkCentre Pro 423 428 1 2 CHAPTER 1 SERVICE CALL PROCEDURE 03 02 1 1 Trimming...
Page 31: ...CHAPTER 2 TROUBLESHOOTING...
Page 32: ......
Page 76: ...WorkCentre Pro 423 428 2 44 CHAPTER 2 TROUBLESHOOTING 03 02 2 3 Level 2 Troubleshooting...
Page 243: ...CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING...
Page 244: ......
Page 273: ...CHAPTER 4 DISASSEMBLY ASSEMBLY AND ADJUSTMENT...
Page 274: ......
Page 329: ...CHAPTER 5 PARTS LIST...
Page 330: ......
Page 415: ...03 02 5 2 Parts List WorkCentre Pro 423 428 5 85 CHAPTER 5 PARTS LIST...
Page 416: ...CHAPTER 6 GENERAL...
Page 417: ......
Page 456: ...CHAPTER 7 ELECTRICAL WIRING DIAGRAMS...
Page 457: ......
Page 476: ...CHAPTER 8 ACCESSORIES...
Page 477: ......
Page 535: ...WorkCentre Pro 423 428 8 58 CHAPTER 8 ACCESSORIES 03 02 8 22 Stamp Kit Red...
Page 536: ...CHAPTER 9 BSD Block Schematic Diagram...
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