Events: ISDN PRI (T1)

 Event Structure What is ISDN PRI (T1) physical event ?...

PH decoding by using Clarinet Event-Editor with a filter ...

Protocol stack Which protocol specifications to be defined 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

ph_isdn_pri_t1_decod.gif (14866 octets)

 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

q931_isdn_t1_stack.gif (7417 octets)

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 allows to display the successive states of the physical interface.

 

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updated:  27-Feb-04