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List Of Outstanding Events Generated By BSC 2780/3780

List Of Outstanding Events Generated By BSC 2780/3780

List of Outstanding Events Generated by BSC 2780/3780

List of Arguments 2

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).


Table C-1: List of Outstanding Events Generated by BSC 2780/3780
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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Posted: Thu Jan 25 14:17:28 PST 2001
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