Events: Q921-LAPD

	Event Structure	What is a BOP event?...
	Q921 decoding	by using Clarinet Event-Editor with a filter ...
	Protocol stack	Which protocol specifications to be defined in the current filter ?...
	Standards	ITU Recommendation Q921-LAPD ETSI ETS 300 125
	Options	Changing the display conditions in the current filter ?...

q921_isdn_decod.gif (14207 octets)

q921_lic_isdn_decod.gif (10048 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 level of Decoding as specified in the filter (Stack).
Protocol fields	Q921	(Address) <PDU type> Ctrl [nnnn]
Service fields	An optional string to display the fields conveyed by the UI frames (SAPI:63, TEI:127) under the format: Management entity: M:xx R:xxxxx AI:(xxx) Msg x: designation
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.

	(Address)	Address field in the format (S:xx T:xxx C/R:x) or (S:xx C:x L:xx yy zz) for extended address:
	S:xx	SAPI value.
	T:xxx	TEI value.
	C/R:x or C:x	C/R bit value (0 or 1).
	L:xx yy zz	value of the extended address.
	<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 of information frame (I or UI).

Field name

M:xx

Management Entity Identifier.

R:xxxxx

Reference number.

AI:(xxx)

Action indicator.

Msg x designation

q921_isdn_stack.gif (7236 octets)

updated: 27-Feb-04