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Bandwidth Key Words: DS1, T-1, DS2, T-2, DS3, T-3, DS4, T-4, OC-1, OC-3, OC-12, OC-48, ATM, Bandwidth Resources, MPLS, Satellite, Internet and Bandwidth Speeds.

Explaining Bandwidth The Easy Way.

Hopefully this will clear up and make some sense of some "Buzz words" that are commonly used.

T1 or DS-1 - This is the equivalent of 24 phone lines. A T1 handle 1.5 million bits per second [1.5Mbps]. The key word is BITS not bytes. Bits are much smaller than bytes - and they have a vary compare to a byte. A bit is One - A byte can be 4,8,10,12,16 depending on the thing we are talking about - The telecommunications industry uses bits - so we do to.. Please never confuse the two. From a PC standpoint 8 bits equal one 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.

Bandwidth Chart
Connection Type Bits per Second Bytes per Second Download time of 5 Megs
14.4 Modem 14,400 1,600 52 minutes
28.8 Modem 28,800 3,200 26 minutes
33.6 Modem 33,600 3,800 22 minutes
56k Line 57,600 7,168 12 minutes
64k 1 ISDN B Channel 65,535 8,192 10 minutes
128k 2 ISDN B Channels 131,072 16,384 5 minutes
T1/DS1 1,536,000 192,000 43 seconds
T2/DS2 6,144,000 768,000 7 seconds
T3/DS3 46,080,000 5,760,000 1 second
T4/DS4 276,480,000 34,560,000 0.2 seconds
Sonet/OC1 51,000,000 6,380,000 0.9 seconds
Sonet/OC3 155,000,000 19,370,000 0.5 seconds
Sonet/OC12 600,000,000 75,000,000 0.15 seconds
Sonet/OC48 2,400,000,000 300,000,000 Give me a break?

Originally by Dennis Cox From The Develop Company at Internet Global 

Bandwidth Geographic Search

Bandwidth Coverage Area

Unlike DSL and other broadband technologies that are limited to only densely populated areas, T1 Bandwidth service is available just about anywhere with a phone line. T1 Bandwidth, also known as DS1 Bandwidth, uses repeaters to boost up the signal strength of the transmission - allowing it to travel up to 50 miles away from the nearest Central Office location. Our coverage area includes all of the following states:


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