WorkCentre Pro 423/428 2-94 CHAPTER 2 TROUBLESHOOTING
03/02 Level 2 Troubleshooting
Table 4 Causes of SI Packet Disconnection (Cause)
Code value Description
01 Local terminal procedure error
03 Network congestion
07 Fault recovery
Table 5 Diagnostic Results of SI Packet (Diag)
Code
value
Description Code value Description
11 Packet level ready 27 Packet too long
12 Wait for complete
disconnection of all calls
29 Illegal SQ, SI, or SF packet
21 Packet type unknown 34 Timeout in SF packet wait
26 Packet too short 00 Other
Table 6 Causes of RI Packet Disconnection (Cause)
Code value Description
00, 80-FF Reset or restart request from remote terminal
01 Communication disabled by remote fault
03 Remote procedure error
05 Local procedure error
07 Network congestion
09 Remote terminal recovery
11 Protocol mismatch with remote terminal
1D Network fault
Table 7 Diagnostic Results of RI Packet (Diag)
Code value Description Code value Description
01 Invalid information 23 Packet type unknown (at PVC
communication)
02 Invalid information 26 Packet too short
11 Packet level ready 27 Packet too long
12 DTE restart request 29 Illegal SQ, SI, or SF packet
1B Flow control ready 2B Verification packet not permitted
1C RF wait 2C Packet not permitted
21 Packet type unknown 00 Other
2.3.2.5.2 Session Protocol (Layer 5 of B channel)
For the normal sequence of the Session protocol, see "Session" in the B-channel sequence.
A CSE signal is sent at the end of communication in the Session layer. If communication is
suspended, a CSA signal is sent. The cause of a fault can be confirmed by analyzing the
session end parameter information contained in this signal.
Table 8 Signals Used in Session Protocol (Layer 5 of B channel)
Signal Meaning Description
CSS Session start indication Originating terminal ID and date and time
information*See 2.3.2.5.2-2
CSE Session end indication 11 01 (session end parameter)*See Table 9
CSA Session suspend indication 11 01 (session end parameter)*See Table 9
CDS Document start indication (Explanation omitted)
CDE Document end indication Checkpoint reference information *See 2.3.2.5.2-1
CDCL Document function list
indication
(Explanation omitted)
RSSP Session start affirmation Terminating terminal ID and date and time
information *See 2.3.2.5.2-2
RSSN Session start negation (Explanation omitted)
RSEP Session end affirmation -
RSAP Session suspend affirmation -
RDCLP Document function list
affirmation
(Explanation omitted)
RDEP Document end affirmation Checkpoint reference information *See 2.3.2.5.2-1
CDPB Document page boundary
indication
Checkpoint reference information *See 2.3.2.5.2-1
RDPBP Document page boundary
affirmation
(Explanation omitted)
RDPBN Document page boundary
negation
32 01 (reason) *See Table 10
CDUI Document user info -
CSCC Session change control
indication
-
CSUI Session user information (Explanation omitted)
RSCCP Session control change
affirmation
-
RSUI Session user information -
CDR Document resynchronous
indication
32 01 (reason) *See Table 10
CDD Document discard indication 32 01 (reason) *See Table 10
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