INTERNATIONAL  TELECOMMUNICATION  UNION

		     ITU-T RECOMMENDATION SUMMARY


Rec. No. : F.104

Title :	International leased circuit services - customer circuit 
	designations
 
Study Group : I - Services

Version : New

Date of adoption : 1991

Notes :	


CCITT Recommendation M.140 (Designations of international circuits, 
groups, group and line links, digital blocks, digital paths, data 
transmission systems and related information) specifies a scheme for 
the designation of international routes.

The designation scheme is based on a layered approach with:

	layer 1 - a unique identification providing limited 
		  information;

	layer 2 - additional information that must be known at both 
		  termination of the route; and

	layer 3 - (optional) - bilateral information not the subject 
		  of international standardization.

Recommendation F.104 precises the way in which Recommendation M.140 is 
applicable to customer international circuit designations.



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