Events: X25-LAPB

Event structure

 Explanation of protocol events.

X25-LAPB decoding

 Using the Clarinet Event-Editor and an appropriate filter.

Protocol stack

 Defining a list of protocols used in the current filter.

Standards

  • ITU Recommendation X25

Options

Changing the display conditions in the current filter ?...

Clarinet Event-Editor: X25-LAPB decoding

x25lapb_vs_decod.gif (11388 octets)

Event information

Date

 Date of the event (end of BOP frame) in the format: hh:mm:ss/xxx.y

N

 The interface number which identifies the Clarinet-interface connected to the host.

Link type
  • TS: Signalling Link  Transmit direction
  • RS: Signalling Link Receive direction
  • TD: Data Link Transmit direction
  • RD: Data Link Receive direction

Dx

 The decoding level as specified in the filter (protocol stack).

Protocol fields

X25-LAPB

 (Address) <PDU type> Ctrl    [nnnn]

Data field

 Optional field of the conveyed data, displayed if no upper layer of protocol has to be decoded.
The display mode can be Hexa, Ascii or Ebcdic as specified in the filter.

X25-LAPB Protocol fields

(Address)

 Address field in the format (xx).

<PDU type>

 Type of frame.

Ctrl

 Control field in the format P/F:x NR:xxx NS:xxx :

P:x or P/F:x

 value of P or P/F bit (0 or 1).

NR:xxx

 value of NR (sequence Number Received).

NS:xxx

 value of NS (sequence Number Sent).

[nnnn]

 Length of the data field.

Protocol stack applied

x25lapb_vs_stack.gif (7295 octets)

 

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