Solved

Direct Cable Connection Speed

Posted on 2000-03-17
5
205 Views
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.
0
Comment
Question by:cains
5 Comments
 

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.
0
 
LVL 32

Accepted Solution

by:
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.
0
 

Author Comment

by:cains
ID: 2631433
Thank-you...problem solved
0
 

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.
0
 

Author Comment

by:cains
ID: 2634211
Thanks for the additional comment
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I will show you HOW TO: Perform a Physical to Virtual (P2V) Conversion the easy way from a computer backup (image).
This article summaries thoughts and ideas from two years of sustained use. It provides good reasoning to make the jump to Windows 10.
The viewer will learn how to successfully create a multiboot device using the SARDU utility on Windows 7. Start the SARDU utility: Change the image directory to wherever you store your ISOs, this will prevent you from having 2 copies of an ISO wit…
The Task Scheduler is a powerful tool that is built into Windows. It allows you to schedule tasks (actions) on a recurring basis, such as hourly, daily, weekly, monthly, at log on, at startup, on idle, etc. This video Micro Tutorial is a brief intro…

713 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question