Events: V120 Layer 2

	Event Structure	What is a BOP event?...
	V120-L2 decoding	by using Clarinet Event-Editor with a filter ...
	Protocol stack	Which protocol specifications to be defined in the current filter ?...
	Standards	ITU Recommendation V120
	Options	Changing the display conditions in the current filter ?...

Clarinet Event-Editor: V120-L2 decoding

	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	V120	(Address) <PDU type> Ctrl    [nnnn] Header
	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.

V120-L2 Protocol fields

	(Address)	Address field in the format (L:xxxx C/R:x) :
	L:xxxx	value of LLI (Logical Link Identifier).
	C/R:x or C:x	C/R bit value (0 or 1).
	<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) without header, if any.
	Header	Header fields in the format H:-x--xxxx   CS:-yyy---- :
	-x--xxxx	bit configuration of the terminal adaption Header within the relevant octet.
	yyy	bit configuration of the Control State information within the optional header extension octet.

Protocol stack applied

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updated:  27-Feb-04