Events: Q922

Event Structure

What is a BOP event ?...

Q922 decoding

by using Clarinet Event-Editor with a filter ...

Protocol stack

Which protocol specifications to be defined in the current filter ?...

Standards

  • ITU Recommendation Q922 ( + annex A for Core aspects )

Options

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

Clarinet Event-Editor: Q922 decoding

q922_vs_decod.gif (9495 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

Q922

 <PDU type> Ctrl    [nnnn]
Address

Data field

 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.

Q922 Protocol fields

<PDU type>

 Type of frame.

Ctrl

 Control field in the format P/F:x NR:xxx NS:xxx (except for Core data annex A) :

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.

(Address)

 Address field DLCI:xxxxxxx C/R:x FECN:x BECN:x DE::x DLCC:--

DLCI:xxxxxxx

 Value of Data Link Connection Identifier.

C/R:x

 C/R bit value (0 or 1).
FECN:x Forward Explicit Congestion Notification bit value (0 or 1).
BECN:x Forward Explicit Congestion Notification bit value (0 or 1).
DE:x Discard Eligibility Indicator bit value (0 or 1).
DLCC:-- DL-CORE control (-- not used).

Protocol stack applied

q922_vs_stack.gif (7247 octets)

 

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updated:  27-Feb-04