INTERNATIONAL  TELECOMMUNICATION  UNION

		     ITU-T RECOMMENDATION SUMMARY


Rec. No. : I.321

Title :	B-ISDN Protocol reference model and its application

Study Group : XVIII - ISDN

Version : New

Date of adoption : 1991

Notes :	


Recommendation I.320 contains the description of the ISDN protocol 
reference model (PRM). 

Recommendation I.321 is based on the ISDN protocol reference model as 
defined in Recommendation I.320, and wherever not explicitly 
indicated, it should conform with Recommendation I.320. The purpose of 

Recommendation I.321 is to take into account the functionalities of 
B-ISDN, which may eventually be incorporated into Recommendation I.320, 
as an expansion of the existing ISDN protocol reference model. The 
Protocol Reference Model in Recommendation I.321 is called 
"B-ISDN PRM" (protocol reference model of the broadband aspects of 
ISDN).



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