Events: ISDN PRI (T1)

	Event structure	What is ISDN PRI (T1) 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	G703;G704
	Options	Changing the display conditions in the current filter.

Clarinet Event-Editor: ISDN PRI (T1) physical layer 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> The "-+" or "+-" mark indicates the alarm or info_bit state transition.
		Type 2: Error	<error string>

PH-ISDN PRI (T1) 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	Fa loss of frame alignment Bl blue alarm Ye yellow alarm D3/D4 loss of multi-frame alignment (abcd signalling) ESF/Ye yellow alarm indication send to the remote end by the ESF Data Link
	<error_string>	CRC error (ESF multi-frame CRC6 value) Clock slip ESF (error on the F or S pattern)

Protocol stack applied

ISDN PRI (T1) native event

The ISDN PRI (T1) physical events are generated by the analysis process on the PH link when the physical interface type is based on ISDN PRI (T1 Trunk):

• Every transition of state of the physical interface (frame alarm, multiframe alarm) generates an event.
• Additional events can be generated upon detection of :
  • A clock slip.
  • An errored CRC6 value, an error on the F bit pattern (ESF multi-frame).
  • An error on the multi-frame S bit pattern.

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

The edition of the ISDN PRI (T1) physical events without any decoding/formatting enables the successive states of the physical interface to be displayed.

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