Events: ISDN PRI (E1)

	Event structure	What is ISDN PRI E1 physical event?
	PH 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 G703, G704
	Options	Changing the display conditions in the current filter.

ISDN PRI E1 event 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: from the user side. NETWORK: from the network side.
	Protocol fields	Type 1: State	ALARM <alarm 1> <alarm 2> ... <alarm n> or MULTIFRAME <alarm 1> <alarm 2> The "-+" or "+-" mark indicates the alarm or info_bit state transition.
		Type 2: Error	<error string>

PH-ISDN PRI (E1) Protocol fields

	<alarm i>	Alarm or info_bit state evolution in the following format: xydesignation
	xy	++ ON state stable (no transition) -- OFF state stable (no transition) +- transition from the ON state to the OFF state -+ transition from the OFF state to the ON state
	Designation	FL loss of frame alignment PVT in french ALM alarm indication to the remote end PVTd in french AIS alarm indication signal (2 Mbits) SIA in french CRC CRC multi-frame alignment   AIS64K alarm indication signal (TS 16)   Sa7 Sa7 bit of TS0   MFL loss of multi-frame alignment (abcd signalling). PVMT in french ALM alarm indication to the remote end (abcd signalling) PVMTd in french
	<error_string>	CRC error (multi-frame CRC4 value) Clock slip

Protocol stack applied

Native ISDN PRI (E1) physical event

The ISDN PRI (E1) physical events are generated by the analysis process on the PH link when the physical interface type is based on ISDN PRI (E1 Trunk):

• Every transition of state of the physical interface (frame alarm, multiframe alarm, info bit) generates an event.
• Additional events can be generated upon detection of a clock slip or an errored CRC4 value.

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

The edition of the ISDN PRI (E1) physical events without any decoding/formatting enables the successive states of the physical interface to be displayed.

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