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AIXLink/X.25 1.1 for AIX: Guide and Reference

Diagnostic Codes for X.25 and SNA Services

The CCITT has defined diagnostic codes for X.25 communications and SNA Services.

CCITT Diagnostic Codes

The CCITT defines the X.25 diagnostic codes as follows:

List of CCITT Diagnostic Codes
Hex Dec Meaning
00 0 Clear or reset generated during restart.
01 1 Incorrect P(S) in packet from DCE.
02 2 Incorrect P(R) in packet from DCE.
10 16 Incorrect packet type.
11 17 Incorrect packet from DCE for state r1.
12 18 Incorrect packet from DCE for state r2.
13 19 Incorrect packet from DCE for state r3.
14 20 Incorrect packet from DCE for state p1.
15 21 Incorrect packet from DCE for state p2.
16 22 Incorrect packet from DCE for state p3.
17 23 Incorrect packet from DCE for state p4.
18 24 Incorrect packet from DCE for state p5.
19 25 Incorrect packet from DCE for state p6.
1A 26 Incorrect packet from DCE for state p7.
1B 27 Incorrect packet from DCE for state d1.
1C 28 Incorrect packet from DCE for state d2.
1D 29 Incorrect packet from DCE for state d3.
20 32 Packet not allowed.
21 33 Unidentifiable packet received from DCE.
22 34 Call received on one-way channel.
23 35 Clear or call packet received from DCE on a permanent virtual circuit (PVC).
24 36 Packet received on an unassigned logical channel.
25 37 REJECT not subscribed.
26 38 Packet received from DCE was too short.
27 39 Packet received from DCE was too long.
28 40 Incorrect general format identifier (GFI).
29 41 Restart packet received from DCE with non-zero logical channel identifier.
2A 42 Incorrect fast-select packet received from DCE.
2B 43 Unauthorized interrupt confirmation.
2C 44 Interrupt packet received from DCE when acknowledgment was still outstanding.
2D 45 Unauthorized reject.
30 48 Timer expired (or limit surpassed).
31 49 Timeout or retries reached on call response from DCE.
32 50 Timeout or retries reached on clear response from DCE.
33 51 Timeout or retries reached on reset response from DCE.
34 52 Timeout or retries reached on restart response from DCE.
35 53 Time expired for call deflection.
40 64 Call setup clearing or registration problem.
41 65 Facility/registration code not allowed.
42 66 Facility not allowed.
43 67 Incorrect called address.
44 68 Invalid address in incoming call from DCE.
45 69 Incorrect facility/registration length field.
46 70 Incoming call barred.
47 71 No logical channel available.
48 72 Call collision.
49 73 Duplicate facility requested.
4A 74 Nonzero address length in fast-select clear from DCE.
4B 75 Nonzero facility length in fast-select clear from DCE.
4C 76 Facility not provided when expected.
4D 77 Incorrect CCITT-specified DTE facility.
4E 78 Maximum number of call redirections or call deflections exceeded.
50 80 Miscellaneous.
51 81 Improper cause code from DTE.
52 82 Non-octet aligned.
53 83 Inconsistent Q-bit settings.
54 84 NUI problem.
70 112 International problem.
71 113 Remote network problem.
72 114 International protocol problem.
73 115 International link out of order.
74 116 International link busy.
75 117 Transit network facility problem.
76 118 Remote network facility problem.
77 119 International routing problem.
78 120 Temporary routing problem.
79 121 Unknown called DNIC.
7A 122 Maintenance action (may also apply within a national network).
80 128 Reserved for DTE-defined diagnostic information.

X.25 Licensed Program Specific Diagnostic Codes

The product-specific diagnostic codes are defined as follows:

X.25 Licensed Program Specific Diagnostics
Hex Dec Meaning
81 129 No listener for incoming call.
82 130 No available LCN for call.
83 131 User error.
84 132 User call rejection.
85 133 Call cleared before accept.
86 134 Invalid call reference.
87 135 Registration timer expired.
88 136 Invalid Link layer state.

ISO 8208 Diagnostic Codes

The ISO 8208 diagnostic codes are defined as follows:

ISO 8208 Diagnostics
Hex Dec Meaning
90 144 Timer expired or retransmission count surpassed.
91 145 Timer expired or retransmission count surpassed on interrupt-confirm from DCE.
92 146 T25 timer expired for data packet transmission.
93 147 Timer expired or retransmission count surpassed for reject.
A0 160 DTE-specific signals.
A1 161 DTE operational.
A2 162 DTE not operational (level 2) or no application listening (network).
A3 163 DTE resource constraint.
A4 164 Fast select not subscribed.
A5 165 Incorrect partially full data packet received from DCE.
A6 166 D-bit procedure not supported.
A7 167 Registration or cancellation confirmed.
E0 224 OSI Network Service Problem.
E1 225 Disconnection (transient condition).
E2 226 Disconnection (permanent condition).
E3 227 Connection rejection - reason unspecified (transient condition).
E4 228 Connection rejection - reason unspecified (permanent condition).
E5 229 Connection rejection - quality of service not available (transient condition).
E6 230 Connection rejection - quality of service not available (permanent condition).
E7 231 Connection rejection - NSAP unreachable (transient condition).
E8 232 Connection rejection - NSAP unreachable (permanent condition).
E9 233 Reset - reason unspecified.
EA 234 Reset - congestion.
EB 235 Connection rejection - NSAP address unknown (permanent condition).

SNA Diagnostic Codes

The following diagnostic codes are set in clear- and reset-indication packets, when SNA services is being used.

All diagnostic codes are not necessarily used by all DTEs, but those that are used have the meaning indicated.

The first diagnostic in each group is a general code that may be used in place of the more specific codes within the group.

These codes, set by transmitting DTEs in clear, reset, and restart packets that also have the cause code set to x'80' transferred on SNA-to-SNA connections, are normally delivered to the remote DTE in a corresponding indication packet by DCEs. However, DCEs may override DTE requests. In this event, DCEs place a network-generated nonzero cause code less than 128 in the cause field and insert the network diagnostic code in the diagnostic code field of the resulting indication packet delivered to the remote DTE.

List of CCITT SNA Diagnostic Codes
Hex Dec Meaning
00 0 Normal initialization or termination.
0C 12 Incorrect LLC type.
10 16 Incorrect packet type (general).
11 17 Incorrect packet type for state r1.
12 18 Incorrect packet type for state r2.
13 19 Incorrect packet type for state r3.
14 20 Incorrect packet type for state p1.
15 21 Incorrect packet type for state p2.
16 22 Incorrect packet type for state p3.
17 23 Incorrect packet type for state p4.
18 24 Incorrect packet type for state p5.
19 25 Incorrect packet type for state p6.
1A 26 Incorrect packet type for state p7.
1B 27 Incorrect packet type for state d1.
1C 28 Incorrect packet type for state d2.
1D 29 Incorrect packet type for state d3.
20 32 DCE timer expired (general).
21 33 DCE timer expired: Incoming call.
22 34 DCE timer expired: Clear indication.
23 35 DCE timer expired: Reset indication.
24 36 DCE timer expired: Restart indication.
30 48 DTE timer expired: (general).
31 49 DTE timer expired: Call request.
32 50 DTE timer expired: Clear request.
33 51 DTE timer expired: Reset request.
34 52 DTE timer expired: Restart request.
40 64 Unassigned (general).
50 80 QLLC error: (general).
51 81 QLLC error: Undefined C-field.
52 82 QLLC error: Unexpected C-field.
53 83 QLLC error: Missing I-field.
54 84 QLLC error: Undefined I-field.
55 85 QLLC error: I-field too long.
56 86 QLLC error: Frame reject received.
57 87 QLLC error: Header incorrect.
58 88 QLLC error: Data received in wrong state.
59 89 QLLC error: Time-out condition.
5A 90 QLLC error: Number incorrect.
5B 91 QLLC error: Recovery rejected or ended.
5D 93 QLLC error: ELLC timeout condition.
60 96 PSH error (general).
61 97 PSH error: Sequence error.
62 98 PSH error: Header too short.
63 99 PSH error: PSH format incorrect.
64 100 PSH error: Command undefined.
65 101 PSH error: Protocol incorrect.
66 102 PSH error: Data received in wrong state.
69 105 PAD error: Timeout condition.
70 112 PAD error: (general).
71 113 PAD error: PAD access facility failure.
72 114 PAD error: SDLC FCS error.
73 115 PAD error: SDLC time-out.
74 116 PAD error: SDLC frame incorrect.
75 117 PAD error: I-field too long.
76 118 PAD error: SDLC sequence error.
77 119 PAD error: SDLC frame aborted.
78 120 PAD error: SDLC FRMR received.
79 121 PAD error: SDLC response incorrect.
7B 123 PAD error: Incorrect packet type.
7F 127 PAD error: PAD inoperable.
80 128 DTE-specific (general).
81 129 DTE-specific: 8100_DPPX-specific.
82 130 DTE-specific: INN_QLLC-specific.
83 131 DTE-specific: INN_QLLC-specific.
84 132 DTE-specific: INN_QLLC-specific.
85 133 DTE-specific: INN_QLLC-specific.
86 134 DTE-specific: INN_QLLC-specific.
87 135 DTE-specific: INN_QLLC-specific.
88 136 DTE-specific: INN_QLLC-specific.
89 137 DTE-specific: INN_QLLC-specific.
8A 138 DTE-specific: INN_QLLC-specific.
8B 139 DTE-specific: INN_QLLC-specific.
8C 140 DTE-specific: INN_QLLC-specific.
8D 141 DTE-specific: INN_QLLC-specific.
8E 142 DTE-specific: INN_QLLC-specific.
8F 143 DTE-specific: INN_QLLC-specific.
90 144 Network-specific.
91 145 Network-specific: DDX-P RNR packet received.
A0 160 Packet not allowed (general).
A1 161 Packet not allowed: Incorrect M-bit packet sequence.
A2 162 Packet not allowed: Incorrect packet type received.
A3 163 Packet not allowed: Incorrect packet on PVC.
A4 164 Packet not allowed: Unassigned LC.
A5 165 Packet not allowed: Diagnostic packet received.
A6 166 Packet not allowed: Packet too short.
A7 167 Packet not allowed: Packet too long.
A8 168 Packet not allowed: Incorrect GFI.
A9 169 Packet not allowed: Not identifiable.
AA 170 Packet not allowed: Not supported.
AB 171 Packet not allowed: Incorrect Ps.
AC 172 Packet not allowed: Incorrect Pr.
AD 173 Packet not allowed: Incorrect D-bit received.
AE 174 Packet not allowed: Incorrect Q-bit received.
AE 174 Packet not allowed: Incorrect Q-bit received.
B0 176 DTE-specific: (NPSI gate/date) (general).
B1 177 DTE-specific: No LU-to-LU session.
C0 192 DTE-specific: (general).
C1 193 DTE-specific: Termination pending.
C2 194 DTE-specific: Channel inoperative.
C3 195 DTE-specific: Unauthorized interrupt confirmation.
C4 196 DTE-specific: Unauthorized interrupt request.
C5 197 DTE-specific: PU (PVC) not available.
C6 198 DTE-specific: Inactivity timeout.
C7 199 DTE-specific: Incompatible line configuration.
D0 208 Resources: (general).
D1 209 Resources: Buffers depleted.
D2 210 Resources: PIU too long.
E0 224 Local procedure error: (general).
E1 225 Local procedure error: Packet with LC=0 not received.
E2 226 Local procedure error: Restart or diagnostic packet on LCI =x'000'.
E3 227 Local procedure error: Incoming call received on wrong LC.
E4 228 Local procedure error: Facility not subscribed.
E5 229 Local procedure error: Packet not restart or diagnostic on LCI = x'000'.
E6 230 Local procedure error: Facility parameters not supported.
E7 231 Local procedure error: Facility not supported.
E8 232 Local procedure error: Unexpected calling DTE.
E9 233 Local procedure error: Incorrect D-bit request.
EA 234 Local procedure error: Reset indication on virtual call.
EB 235 Local procedure error: Incorrect protocol identifier.
EC 236 Local procedure error: Connection identifier mismatch.
ED 237 Local procedure error: Missing cause or diagnostic code.

Logical Channel States

The following list describes the logical channel states for the CCITT-defined diagnostic codes.

State Meaning
d1 Flow control ready
d2 DTE reset request
d3 DCE reset indication
p1 Channel ready
p2 DTE call request
p3 DCE incoming call
p4 Data transfer
p5 Call collision
p6 DTE clear request
p7 DCE clear indication
r1 Packet level ready
r2 DTE restart request
r3 DCE restart indication
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