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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 and DirecTV Satellite TV!
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Explaining BandwidthThe 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.
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.
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 |
|---|---|---|---|
| 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