Wednesday, June 28, 2006


T1 or DS-1 - This is the equivalent of 24 phone lines. It had handle 1.5 million bits per second [1.5Mbps] The key word is BITS not bytes. Bits are much smaller then bytes - and they have a vary compare to a byte.

T2 or DS-2 - This is the equivalent of 4 T1's. The capacity is 6.3 million bits per second [6.3Mbps]

T3 or DS-3 - This is the equivalent of 28 T1's. The capacity is 45 million bits per second [45Mbps]

T4 or DS-4 - This is the equivalnet of 6 T3's. The capacity is 274 million bits per second [274Mbps]. Sprint currently uses DS-4 for the backbone.

OC-1 - Sometimes called SONET. OC-1 uses ATM switches [as all OC-X does] and runs at 51 million bits per second [51Mbps]. Uses Fiber

OC-3 - This is the equivalent of 155 million bits per second [155Mbps]. MCI currently runs a few of these on their backbone.
OC-12 - 600 million bits per second [600 Mbps]
OC-48 - 2.4 gigabits per second [2.4 Gbps]

Frame Relay - Basically dead and gone as far the Internet is concerned. Especially with the bandwidth requirements the way they are. Frame relay runs around 64kbps to 1.5Mbps [64,000 bits per second to 1.5 million bits per second]. Frame Relay is shared line with other people and your bandwidth depends on the current utilization of the line.

ATM - Asynchronus Transfer Mode. ATM is a very expensive switching solution that is used in carry OC-3 and OC-12 lines.

Source : netmore

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