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Ping, ping, ping, that familiar sound of a submarine sonar, well that’s a good way to describe what your modem does to send and receive data. To look at your connection speed, you will need to find out how many bytes the modem sends, for instance, 56k would mean at full speed with no one else on that line, you would get 56 kilobytes per second. Your modem at home is probably a 56k, but your not getting any where near that. Now lets go over the connection types. 56.6k modem – This is the fastest of common modems, modems have gone from 8.8k, 14.4, 28.8k, and 36.6k to the faster 56.6, (There are more speeds, these are the most common). A modem, sends pieces of data in bytes, a byte is block so to speak, of information. A kilobyte is composed of 1000 bytes. The modem sends out a piece of data over your telephone line in computer Morse code if you will. Little distinctive sounds that are sent and received through modems. DSL/ADSL/HDSL/SDSL – Digital Subscriber line/Asymmetric Digital Subscriber line/High bit rate Digital Subscriber line/Single Pair Symmetrical Services. All of these DSL types are a bit different, but follow the same idea. DSL put simply: A modem with a higher bandwidth, thus increasing speed. DSL can carry both, data and voice simultaneously. Each type of DSL offers different speeds, and those speeds are dependant on your service provider. ISDN – Integrated Services Digital Network. ISDN comes in two types, BRI, which has a maximum of 144,000 bits per second, and PRI, which in North America is 1,544,000 and in Europe, is 2,048,000 bits per second. There is a downside, it is not compliant with all networks, and has to have its own separate, “area” if you will of the network, which makes it costly. Although the consumer price if slightly less then DSL, it is harder to maintain for your ISP (Internet Service Provider). T1/T2/T3/T4 - The only thing separating these connections is speed, other then that they are all the same. These are the fastest connections around, (Except for gigabyte Ethernet, which is a different idea) they are direct lines from your ISP (Internet Service Provider). The speeds are as follows: T1 – 1.544 Mbps or 1,544,000 bits per second. T2 – 6.312 Mbps or 6,312,000 bits per second T3 – 44.736 Mbps or 44,736,000 bits per second T4 – 274.176 Mbps or 274,176,000 bits per second. The T class of internet connections can be run on coxial cable, (like television cable), fiber optic lines, or microwave radio transmissions. (A little interesting fact, both Bill Gates and George Lucas have T3 lines coming into their homes). Generally anything above a T1 is used as the backbone for telecommunication networks. |
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