INTERNATIONAL  TELECOMMUNICATION  UNION

		     ITU-T RECOMMENDATION SUMMARY


Rec. No. : G.707

Title :	Synchronous digital hierarchy bit rates

Study Group : XV - Transmission Systems and Equipment

Version : Revised

Date of adoption : 1991

Notes :	


The CCITT recommends:

	-   that the first level of the synchronous digital hierarchy 
	    shall be 155 520 kbit/s;

	-   that higher synchronous digital hierarchy bit rates shall 
	    be obtained as integer multiples of the first level bit 
	    rate;

	-   that higher synchronous digital hierarchy levels should be 
	    denoted by the corresponding multiplication factor of the 
	    first level rate;

	    that the bit rates 155 520 kbit/s (1st level), 
622 080 kbit/s (level 4) and 2 488 320 (level 16) should constitute 
the synchronous digital hierarchy.



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