Digital Signal Designator	Data Rate	DS0 Multiple	T-Carrier	E-Carrier
DS0				     64 Kbps	1		-		-
DS1				  1.544 Mbps	24		T-1		-
-				  2.048 Mbps	32		-		E1
DS1C				  3.152 Mbps	48		-		-
DS2				  6.312 Mbps	96		T-2		-
-				  8.448 Mbps	128		-		E2
-				 34.368 Mbps	512		-		E3
DS3				 44.736 Mbps	672		T-3		-
-				139.264 Mbps	2048		-		E4
DS4/NA				139.264 Mbps	2176		-		-
DS4				274.176 Mbps	4032		-		-
-				565.148 Mbps	4 E4 channels	-		E5


Synchronous Transfer Signal	Optical Carrier Level		Data Rate
STS-1				OC-1				 51.84  Mbps
STS-3				OC-3	STM-1			155.52  Mbps
STS-12				OC-12	STM-4			622.08  Mbps
STS-24				OC-24				  1.244 Gbps
STS-48				OC-48	STM-16			  2.488 Gbps
STS-192				OC-192	STM-64			 10     Gbps
STS-256				OC-256				 13.271 Gbps
STS-768				OC-768				 40     Gbps


OC-n	[Optical Carrier] A basic unit defined in increments of 51.84 Mbps (OC-1/STS-1 speed),
	where n is a multiple of that unit. Uses optical fiber network

STM-n	[Synchronous Transfer Module] A basic unit defined in increments of 155.52 Mbps
	(OC-3/STM-1 speed), where n is a multiple of that unit. 

STS-n	[Synchronous Transfer Signal] Similar to OC-n but uses electrical network.