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EXPLAINING BANDWIDTH
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 telecommuncations
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? |
For other techical questions or problems contact: Carlos Collazo
at Spyderswebworks.com
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