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myfishbone
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Lebanon		Posted - 12/27/2003 1:43:35 AM  Show Profile  Email Poster  Edit Message
hello, my 56k modem (46.6 connect) sometimes reaches 13kbps download speeds for about 2-3 minutes, what exactly causes this? and cant i make it occur more regularly, my average download speed is 5kbps ,please help me!!!
charles
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USA		Posted - 12/27/2003 2:23:53 AM  Show Profile  Email Poster  Edit Message
Are you talking about the speed when you first start downloading?
http://www.seniorscan.ca/guide/components/modem.html
Error correction is the method by which modems verify that the information sent to them has been undamaged during the transfer. Error-correcting modems break up information into small packets, called frames. The sending modem attaches a checksum to each of these frames. The receiving modem checks whether the checksum matches the information sent. If not, the entire frame is resent. Though error correction may slow down data transfer on noisy lines, it does provide greater reliability. MNP2-4, as well as V.42, are error correction protocols. These protocols determine how the modems verify data. As with data compression protocols, for an error correction protocol to be used, it must be supported by both modems in the connection.
Often, one modem in a connection is capable of sending data much faster than the other can receive. Flow control allows the receiving modem to tell the other to pause while it catches up. Flow control exists as either software, or XON/XOFF, flow control, or hardware (RTS/CTS) flow control. With software flow control, when a modem needs to tell the other to pause, it sends a certain character, usually Control-S. When it is ready to resume, it sends a different character, such as Control-Q. Software flow control's only advantage is that it can use a serial cable with only three wires. Since software flow control regulates transmissions by sending certain characters, line noise could generate the character commanding a pause, thus hanging the transfer until the proper character (such as Control-Q) is sent. Also, binary files must never be sent using software flow control, as binary files can contain the control characters. Hardware, or RTS/CTS, flow control uses wires in the modem cable or, in the case of internal modems, hardware in the modem. This is faster and much more reliable than software flow control
Edited by - charles on 12/27/2003 2:44:32 AM
v.Richard
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USA		Posted - 12/29/2003 8:23:20 AM  Show Profile  Email Poster  Edit Message  v.Richards Homepage
You probably mean 13KB/s download speed (= ~115kbps) and 5KB/s (~45kbps) (KB=kiloBYTES kbps = kiloBITS per second)

When the data you are transferring is compressible, you can transfer more data than the connect speed. To make data transfer faster more regularly, only access data that can be compressed.
Seriously - there's nothing you can do - if the data were uncompressed to begin with (which would make it transfer at a faster rate to you), there would be more data to transfer, so the net time would be about the same.

Aloha! Richard.

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