Events: CAS abcd Signalling

	Event structure	What is CAS abcd signalling physical event?
	PH decoding	Using the Clarinet Event-Editor with an appropriate filter.
	Protocol stack	Defining a list of protocols used in the current filter.
	Standards	ITU Recommendation G704
	Options	Changing the display conditions in the current filter.

Clarinet Event-Editor: CAS abcd signalling decoding

	Event information	Date	Date of the event in the format: hh:mm:ss/xxx.y
		N	The interface number which identifies the Clarinet-interface connected to the host.
		Link type	USER SIGNALLING: from the user side. NETWORK SIGNALLING: from the network side.
	Protocol fields	State	<channel> <bit a> <bit b> <bit c> <bit d> The "»" mark indicates the signalling bit which undergoes a state transition.

CAS abcd signalling Protocol fields

	<channel>	Channel number in the following format: channel:xx
	xx	Channel number from 1 to 30.
	<bit>	Value of the signalling bit.

Protocol stack applied

Native CAS abcd signalling event

The CAS abcd signalling events are generated by the analysis process on the PH link when the physical interface type is based on ISDN PRI (E1 or T1 Trunk in CAS abcd signalling mode). Every transition of state of an a,b,c,d signalling bit relating to a channel generates an event.

The binary event structure is defined in the Clarinet-API.

The edition of the CAS abcd signalling events without any decoding/formatting enables the successive signalling states of the channels to be displayed.

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