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0150 | Start time-out T1 |
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01A4 | Start time-out T2 | System |
01F8 | Start time-out T3 | time-outs |
024C | Start inactivity time-out |
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02F4 | ENQ |
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0348 | EOT |
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039C | DLE EOT |
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03F0 | DLE 0 | Control |
0444 | DLE 1 |
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498 | NAK | messages |
04EC | WACK |
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0540 | RVI (Reverse Interrupt) |
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0594 | TTD (Temporary text delay) |
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05E8 | Single block |
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063C | First block | Data |
0690 | Intermediate block |
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06E4 | Last block |
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078C | Missing STX, single block | Abnormal |
07E0 | Missing STX, first block | data |
0834 | ENQ in text |
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0054 | CRC single block |
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00A8 | CRC first block | CRC data |
00FC | CRC intermediate block | error |
01F0 | CRC last block |
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01A4 | Time-out (reception, in case of errors). |
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| Event Code | Argument 1 | Argument 2 | Comments |
|---|---|---|---|
00 | 0004 | 0000 | Connection refused by DLC BSC: End of data transfer state in progress or configured calling line (no call reception allowed). Action: clear VC. |
| 0008 000C | 0030 0030 | Disconnect coming from DLC BSC. Action: clear VC. |
01 | 0004 | 0000 | Connection accepted by DLC BSC. |
| 0004 | 0020 | Connect request coming from DLC BSC. |
18 | 0008 000C | 0010 0010 | Disconnect coming from X.25 network. |
19 | 0004 0008 | 0000 | Connect coming from X.25 network. |
20 | 0000 up to 0050 | 0000 | Unknown data. Action: transmission of EOT and virtual circuit is cleared. |
22 | 0004 | 0000 | Station unknown; connection refused by DLC BSC. |
| 0004 | 02F4 | Station unknown; establishment of VC refused. |
29 | 0008 0010 | 024C | Supervision mode: Expiry of inactivity time-out. Action: clear of VC and transmission of EOT. |
| 0018 001C 0020 0024 002C 0030 | 024C | Data receive mode: Expiry of inactivity time-out. Action: passage to the end of data transfer request state. |
| 0028 | 024C | Data receive mode: Expiry of inactivity time-out. Action: clear of VC and transmission of EOT. |
| 0038 | 024C | Data transmit mode: Expiry of inactivity time-out. Data not yet arrived from remote equipment; Passage to End of Data Transfer Request state. |
| 003C 0040 0044 0048 004C 0050 | 024C | System reserved. |
33 | 003C 0044 0048 | 0498 0498 0498 | Data transmit mode: NAK reception counter reached. Action: transmission of EOT. |
35 | 003C 0040 | 0150 0150 | Supervision receive mode: No answer from equipment; ENQ transmission counter reached. Action: transmission of EOT. |
| 0044 0048 | 01F8 01F8 | Data transmit mode: No answer from equipment; ENQ transmission counter reached. Action: transmission of EOT. |
| 0044 0044 0048 0048 | 03F0 0444 03F0 0444 | Data transmit mode: Synchronisation DLE 0/1 lost; ENQ transmission counter reached. Action: transmission of EOT. |
| 004C | 01A4 | Data transmit mode: ENQ transmission counter reached while no data to transmit. Action: transmission of EOT. |
36 | 0024 | 0150 | Data receive mode after a too long frame: NAK transmission counter reached. Action: transmission of EOT. |
| 0018 001C 0020 0024 0028 002C 0030 | 0834 | Data receive mode after ENQ in text: NAK transmission counter reached. Action: transmission of EOT. |
| 0018 002C 0030 001C 0020 0024 | 0054
0150 | Data receive mode after reception of data with CRC error: NAK transmission counter reached. Action: transmission of EOT. |
| 0018 001C 0020 0024 002C 0030 | 01A4 | Data receive mode after time-out and a too long frame: NAK transmission counter reached. Action: transmission of EOT. |
43 | 003C | 02F4 | Supervision mode: Collision ENQ; start of time-out T1, configured primary or secondary (1 sec or 3 sec). |
44 | 0010 | 08DC | Supervision mode: Collision interrupt (ENQ); Collision management depending of configuration (primary or secondary) of the BSC equipment facing the COMPAC equipment. |
45 | 0018 001C 0020 0024 0028 002C 0030 0034 | 0984 | Data receive mode: Interrupt (RVI) received from remote equipment; the RVI status message will be transmitted on reception of the next data message. |
46 | 000C | 02F4 | Supervision mode: ENQ received, interrupt (ENQ) transmitted to the remote equipment. |
47 | 000C | 08DC | Supervision mode: Interrupt (ENQ) received is accepted by the local equipment. Meaning: transfer accepted and the data transmission mode is entered. |
| 0010 | 0930 | Supervision mode: Interrupt (ENQ) sent earlier was accepted; supervision mode is finished; Action: transmission of DLE 0 answering an ENQ; Entering into the data receive mode. |
48 | 0014 | 08DC | Interrupt (ENQ) received in the wait and waste state as a result of a protocol violation. Action: interrupt (ENQ) refused. |
| 0034 | 08DC | Interrupt (ENQ) received during End of Data Transfer ® Interrupt (ENQ) is refused. |
| 0038 003C 0040 0044 0048 004C 0050 | 08DC | Interrupt (ENQ) received in Data transmit mode. Action: Interrupt (ENQ) is refused. |
49 | 0034 | See list | Leaving the End of Data Transport Request State. |
| 0018 001C 0020 0024 002C 0030 | 00A8 | Data receive mode: Entering the End of Data Transfer Request State when receiving a Disconnect from the network. |
| 003C 0040 0044 0048 004C 0050 | 00A8 | Data transmit mode: Entering the End of Data Transfer Request State when receiving a Disconnect from the network. |
49 | 0018 001C 0020 0024 002C 0030 | 0A2C | Data receive mode: Entering the End of Data Transfer Request State when informed about the End of an Abnormal Data Transfer from the remote equipment. |
| 0038 003C 0040 0044 004C 0050 | 0A2C | Data transmit mode: Entering the End of Data Transfer Request State when informed about the End of an Abnormal Data Transfer from the remote equipment. |
| 0028 | 0A2C | Data receive mode: When informed about the End of an Abnormal Data Transfer from the remote equipment, the data transfer is halted immediately. |
| 000C | 0A2C | No Data Transfer going on: Notification of abnormal ending of the transfer from the remote equipment. |
51 | 0028 | 01A4 | File receive mode: Transmission of a WACK because the X.25 traffic is congested. |
53 | 0044 0048 | 03F0 | Data transmit mode: DLE0 received instead of DLE1. Action: transmission of ENQ. |
54 | 0044 0048 | 0444 | Data transmit mode: DLE1 received instead of DLE0. Action: transmission of ENQ. |
55 | 003C | 0498 | Supervision mode: NAK received, responding an ENQ. Action: retransmit an ENQ. |
| 0044 0048 | 0498 | Data transmit mode: NAK received, responding a data transmission. Action: retransmit data. |
| 0024 | 0150 | Data receive mode: End of BSC message not received at the expiry of time-out T1. Action: transmission of a NAK. |
| 0024 | 01A4 | Purge state: when receiving a time-out, transmission of a NAK. |
56 | 0008 0010 | 0348 | Supervision mode: Reception of an EOT. Action: Supervision mode aborted, clear. |
| 0018 0028 002C | 0348 | Data receive mode: Reception of EOT before the last ETX block. Error of the BSC terminal. |
| 0030 | 0348 | Data receive mode: Reception of EOT after last block ETX. The data transfer is terminated normally. |
| 003C | 0348 | Refusal of BSC equipment to accept a data transfer. |
| 0040 | 0348 | End of ENQ collision. The COMPAC equipment tries to resume by transmitting an ENQ. |
56 | 0044 0048 004C | 0348 | Data transmit mode aborted prematurely by the BSC equipment. |
| 0004 000C | 0348 | Supervision mode: Reception of an EOT in the Disconnect (004) or the Connect (00C) state. |
57 | 0018 002C 0030 0018 002C 0030 001C | 02F4
05E8
06E4 | Data receive mode: Transmission of an RVI (Reverse Interrupt). |
58 | 004C | 01A4 | Data transmit mode. Data not available for transmission. Action: transmission of an ENQ (2780) or a TTD (3780). |
59 | 0004 | 039C | Supervision mode, disconnect state: Reception of DLE EOT. Action: none. |
| 0008 | 039C | Supervision mode, in "being connected" state: Reception of DLE EOT. Action: clear VC. |
| 000C 0010 | 039C | Supervision mode, connect state: Reception of DLE EOT. Action: clear VC. |
| 0014 | 039C | Supervision mode, wait and waste state: Reception of DLE EOT. Action: clear VC. |
| 0018 0028 002C 0030 | 039C | Data receive mode: Reception of DLE EOT. Action: clear VC. |
| 003C 0040 0044 0048 004C | 039C | Data transmit mode: Reception of DLE EOT. Action: clear VC. |
70 | 0014 001C 0020 0034 | 01F8 | Intermediate frame too long. Action: await last frame too long. |
| 0014 001C 0020 0034 | 024C | Last frame too long. Action: Await time-out. |
77 | 0018 002C 0030 | 078C | Data receive mode: Missing STX in single block. Action: no message "Transmission state". |
| 0018 002C 0030 | 07E0 | Data receive mode: Missing STX in first block. Action: await last block. |
78 | 0018 001C 0020 0024 002C 0030 | 0834 | Data receive mode: Reception of an ENQ in the text. Action: Transmit a NAK. |
79 | 0000 to 0050 | 01A4 | Data receive mode: Protection time-out expired, end of BSC message not received. Action: when transferring data: transmit a NAK. When the retransmission counter value has been reached: evt transmission of EOT + clear. |
90 | 0004 0008 000C 0010 0014 | 0054 | Supervision mode: CRC error, single block Action: clear VC and transmit an EOT. |
| 0018 002C 0030 | 0054 | Data receive mode: CRC error, single block. Action: transmission of a NAK. |
| 0028 0034 | 0054 | Data receive mode: CRC error single block wrongly received. Action: clear VC and transmit an EOT. |
| 0038 003C 0040 0044 0048 004C 0050 | 0054 | Data transmit mode: CRC error, single block wrongly received. Action: clear VC and transmit EOT. |
91 | 0004 0008 000C 0010 0014 | 00A8 | Supervision mode: CRC error, first block wrongly received. Action: await last block in wait and waste state. |
| 0018 002C 0030 | 00A8 | Data receive mode: CRC error in first block. Action: await last block. |
91 (Cont'd) | 0028 0034 | 00A8 | Data receive mode: CRC error in first block wrongly received. Action: await last block. |
| 0038 003C 0040 0044 0048 004C 0050 | 00A8 | Data transmit mode: CRC error in first block wrongly received. Action: clear VC and transmit EOT. |
92 | 0014 0024 | 00FC | Wait and waste state: CRC error in intermediate block. Action: await last block. |
| 001C 0020 | 00FC | Data receive mode: CRC error in intermediate block. Action: await last block. |
| 0034 | 00FC | End of Data Transport: CRC error in intermediate block. Action: await last block. |
93 | 0014 | 0150 | Wait and waste state: CRC error in last block. Action: leave wait and waste state; Enter disconnect state. |
| 001C 0020 0024 | 0150 | Data receive mode: CRC error in last block. Action: transmit NAK. |
| 0034 | 0150 | End of Data Transfer: CRC error in last block. Action: transmit EOT. |
97 | - | - | Receipt of a reset from the X.25 network. |
98 | - | - | Protocol violation (argument 1 is the most significant one). |
| 0004 | See list page B2.3 | Supervision mode: disconnect state. Meaning: protocol element wrongly received. Action: none. |
| 0008 | See list page B2.3 | Supervision mode: connect state in progress. Meaning: protocol element wrongly received after reception of an ENQ. Action: clear VC and transmit EOT. |
| 0010 | See list page B2.3 | Supervision mode: connect state. Meaning: protocol element wrongly received. Action: clear VC and transmit EOT. |
| 001C | See list page B2.3 | Supervision mode: connect state. Meaning: protocol element received after reception of an ENQ. Action: clear VC and transmit EOT. |
| 0014 | See list page B2.3 | Supervision mode: wait and waste state. Meaning: protocol element wrongly received. Action: clear VC and transmit EOT. |
98 | 0018 001C 0020 0024 0028 002C 0030 | See list page B2.3 | Data receive mode: Meaning: protocol element received wrongly in data receive mode. Action: clear VC and transmit EOT. |
| 0038 003C 0040 0044 0048 004C 0050 | See list page B2.3 | Data transmit mode: Meaning: wrongly received protocol element in data transmit mode. Action: clear VC and transmit EOT. |
99 | 0099 | 0099 | End of transmission of a supervision message not OK. Action: ignore and continue according protocol. |
| #0099 | #0099 | System reserved. |
Posted: Thu Jan 25 14:17:28 PST 2001
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