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Direct Cable Connection Speed

Posted on 2000-03-17
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Last Modified: 2013-12-28
My OS is Win98 on both machines, I'm using a serial cable connection from Laptop to desktop.  The speed seems very slow in transferring files (20 - 30 min for 2mg file).  Can I speed this up or am I stuck at that rate?  I'm using the desktop as the Host.
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Question by:cains
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Expert Comment

by:Jerome030900
ID: 2630706
You should use the parallel ports and cable if you want the fastest speed. However, since you already have the serial connection working, make sure you set each port to 115,200bps and try again.
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jhance earned 100 total points
ID: 2630982
2 Mbytes in 20-30 minutes....Hmmm

Let's see how long it should take.  the fastest speed that a normal serial port runs is 115,200 bits/sec.  Your 2M file has about 2,000,000 x 10 bits = 20,000,000 bits that need to be sent.  (it's x 10 due to extra bits sent as a part of the serial data).

So at 115,200 b/s, 20,000,000 can be sent in:

20,000,000 / 115,200 = 174 sec ~ 3 minutes.

You have one of two problems:

1) You've configured your serial ports at a slow speed.  If you were running at 9600 bps, then your 20-30 minutes would be consistent with this.  Reconfigure both ends of the connection for 115,200.

2) You are not using hardware flow control and the majority of the sent data is getting trashed and the link has to resend everything.  This may be a configuration problem on your serial ports or you may not be using a proper cable.  To do this right, you need one that is designed for this purpose and has the proper control lines connected.
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by:cains
ID: 2631433
Thank-you...problem solved
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Expert Comment

by:Bluto
ID: 2633681
If you configured for serial, it should also be ready for parallel. You need a special cable(not just a parallel straight thru cable). The cable should be well worth the extra expense because of the extra speed gained.
Laplink is a program that works much better than either serial or parallel Direct Cable Connection. Laplink shows both computers Explorers on the same screen. You can just drag and drop files across from one computer to the other.
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Author Comment

by:cains
ID: 2634211
Thanks for the additional comment
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