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To: t36 who wrote (23255)	6/19/1999 10:50:00 PM
From: Frank A. Coluccio	Respond to of 41369

t36, A T1 is a 1.544 Megabit per second line, and a T2 is rated at 6.3 Mb/s. A T2 is comprised of four (4) T1s, or eighteen of you. (g) Seriously, the numeric designators do not run linear to speed. A T3, for example, consists of 28 T1s, and is rated at 44.736 Mb/s. A T4 consists of six (6) T3s at ~ 280 Mb/s. You can deduce, then, how many T1s it takes to make a T4: (28 T1s per T3) * (6 T3s per T4) = 168 T1s A SONET signal rated at Optical Carrier_level 12 (OC-12) is rated at roughly 622 Mb/s, and consists of an equivalent 12 T3s. These, in turn, are equal to 336 T1s. And so on. You will note that with each increase in speed, from T1 to T2, and then from T2 to T3, the resulting higher speed is not exactly a direct multiple of the lower speed. This is due to the fact that with each successive step up the digiral hierarchy, "stuffing bits" are added to retain synchronization of the lower order signals, and for maintaining other line attributes. Regards, Frank Coluccio