Events: CAS abcd signalling

Event Structure What is CAS abcd signalling 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
  • ITU Recommendation G704
 

Options Changing the display conditions in the current filter ?...

Clarinet Event-Editor: CAS abcd signalling decoding

cas_abcd_decod.gif (12382 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 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

q931_isdn_e1_stack.gif (7440 octets)

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 allows to display the successive signalling states of the channels.

 


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updated:  27-Feb-04