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| 0150 | Start time-out T1 | |
| 01A4 | Start time-out T2 | System |
| 01F8 | Start time-out T3 | time-outs |
| 024C | Start inactivity time-out | |
| 02F4 | ENQ | |
| 0348 | EOT | |
| 039C | DLE EOT | |
| 03F0 | DLE 0 | Control |
| 0444 | DLE 1 | |
| 498 | NAK | messages |
| 04EC | WACK | |
| 0540 | RVI (Reverse Interrupt) | |
| 0594 | TTD (Temporary text delay) | |
| 05E8 | Single block | |
| 063C | First block | Data |
| 0690 | Intermediate block | |
| 06E4 | Last block | |
| 078C | Missing STX, single block | Abnormal |
| 07E0 | Missing STX, first block | data |
| 0834 | ENQ in text | |
| 0054 | CRC single block | |
| 00A8 | CRC first block | CRC data |
| 00FC | CRC intermediate block | error |
| 01F0 | CRC last block | |
| 01A4 | Time-out (reception, in case of errors). |
| 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 (Cont'd) | 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 (Cont'd) | 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 (Cont'd) | 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. |
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