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.
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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. | Connection Type | Bits per Second | Bytes per Second | Download time of 5 Megs |
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| 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 |
