03/02
Level 2 Troubleshooting
WorkCentre Pro 423/428
2-93
CHAPTER 2 TROUBLESHOOTING
2.3.2.5 B channel troubleshooting
If origination or termination is completed through the D channel, the channel is switched to B
for fax signal transmission. In G3 communication through ISDN, the CED, DIS, and PIX
signals of G3 fax are sent through B channels. In B-channel troubleshooting, therefore, it is
necessary to locate a fault in the local or remote terminal.
From the B channels, the protocol trace data of Layers 2 (Network) to 6 (Presentation) can be
collected individually. Seemingly necessary layers should be set before communication.
Even when the protocol layer is changed after communication, its trace data is not recorded.
The default is Layer 5 (Session).
The protocols of Layers 2 (Network) and 5 (Session) are used for troubleshooting the B
channels and that of Layer 6 (Presentation) is used for checking the document size. This
section explains the Network, Session, and Presentation protocols.
2.3.2.5.1 Network Protocol (Layer 3 of B channel)
For the normal sequence of the Network protocol, see "Network" in the B-channel sequence.
In case of a communication fault in the Network layer, one of the packet signals (CQ, CI, SQ,
SI, RQ, and RI) is sent. The cause of the fault can be confirmed by analyzing the cause and
diagnostic information contained in this signal.
Table 1 Packet Signals Used in Network Protocol (Layer 3 of B channel)
Packet
signal
Meaning
Description
CR
Call request
10 01 0B (Origination number) (Termination number)
(Packet size etc.)
CN
Termination
10 01 0B (Origination number) (Termination number)
(Packet size etc.)
CA
Call acceptance
10 01 0F (Origination number) (Termination number)
(Packet size etc.)
CC
Connection
complete
10 01 0F (Origination number) (Termination number)
(Packet size etc.)
CQ
Recovery request
10 01 13 (Cause) (Diag)
CI
Disconnection
indication
10 01 13 (Cause) (Diag) *See Tables 2 and 3
CF
Disconnection
confirmation
10 01 17
SQ
Restart request
10 00 FB (Cause) (Diag)
SI
Restart indication
10 00 FB (Cause) (Diag) *See Tables 4 and 5
SF
Restart confirmation
10 00 FF
RQ
Reset request
10 01 1B (Cause) (Diag)
RI
Reset indication
10 01 1B (Cause) (Diag) *See Tables 6 and 7
RF
Reset confirmation
10 01 1F
DT
Data
10 01 (Packet number etc.)
RR
RECEIVE READY
10 01 (Packet number etc.)
RNR
RECEIVE NOT READY
10 01 (Packet number etc.)
Table 2 Causes of CI Packet Disconnection (Cause)
Code value
Description
01
Remote terminal busy or no free channel
03
Invalid request by CR packet
05
Network congestion
09
Connection failure because remote terminal is faulty or power-off
0B
Connection to remote terminal not permitted
0D
Missing
11
Remote procedure error or illegal packet received
13
Local procedure error or illegal packet sent
19
Termination side not permitting charging on termination
29
Termination side not permitting fast selection
80-FF
Normal disconnection
Table 3 Diagnostic Results of CI Packet (Diag)
Code
value
Description
Code value
Description
11
Packet level ready
31
Timeout in CA packet wait
12
Terminal restart request
32
Timeout in CF packet wait
14
Empty
41
Illegal signal
15
CC packet wait
42
Illegal parameter
16
CA packet wait
43
Invalid termination address
17
Data transfer in progress
44
Invalid origination address
18
Origination-termination
collision
45
Illegal signal length
19
CQ packet wait
46
Termination rejected
21
Packet type unknown
47
No free channel
22
Origination through
termination-only channel
48
Collision of origination and
termination
26
Packet too short
49
Duplicate request
27
Packet too long
4A
Illegal signal length (address
length)
29
Illegal SQ, SI, or SF packet
4B
Illegal signal length (facility
length)
2A
Illegal packet type
00
Other
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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