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RAS access speed

By mteal ·
I am having problems with one RAS user, who only can get speeds of 14,400 bps.

The network runs routing and remote access on Windows NT 4 server. There are 8 modems attached to this server, which is a dedictaed RAS server (nothing else run on it).

There are about 10 other RAS users who get decent speeds (40,000 bps plus).

This one user uses this notebook computer to access an ISP and gets decent speeds (40,000 bps plus) for this connection.

i.e. On the same computer, using the samemodem, he gets 14,4000 bps for his NT RAS connection and 40,000 bps plus for for connection to an ISP. (The ISP are running linux servers). The RAS network and ISP both run TCP/IP.

I have checked the DUN settings for the RAS connection. The maximum speed is set to 57,600. TCP/IP is the only protocol selected.

Any suggestions much appreciated.

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RAS access speed

by jvohs In reply to RAS access speed

56k modems can't operate at the full 56k unless half the link is digital. When you connect to the ISP, they usually have digital lines to the telephone switch. The switch can then transmit to the end user through the analog lines at a higher speed. Analog lines usually don't operate much faster than 33.6+/- upload speed. The 56k, is only for download, or anything originating from the digital side. The ability of the notebook's modem to deal with line noise on a totaly analog connection, may not be that great. Test this theory by connecting from several locations, both new and old buildings. 3com has an explaination on their site.

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RAS access speed

by mteal In reply to RAS access speed

Thank you for your suggestions. This is useful information to know.

I have asked several RAS users to connect. A couple have connected to the same modem as the "problem" user. They got speeds of 31,000 - 35,000 on average. No-one else is having this same problem - the connection speed is always exactly 14,400. Not approximately - exactly.

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RAS access speed

by johnpittman In reply to RAS access speed

I will take a stab at it.

I would focus my attention on the particular modem and line that the slow user connects through. If the line goes through a switch it may slow you down considerably. It is possible that this user dials in in a way that the others do not i.e. (Uses a * ext#).

I assume that your modem pool uses some sort of round robin connection scheme, sometimes there are direct lines in to one particular modem that may be slower and he may connect to it. You never stated exactlythat two different users connected to the same modem at different speeds by using the same dial in number. If they have then my point is moot.

Good Luck

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RAS access speed

by mteal In reply to RAS access speed

Thank you for your suggestions.

I neglected to mention that other RAS users are connecting to the same modem and are not having the same problem. Their speeds of about 31,000 bps aren't ideal, but they are better than 14,400. They are consistenlyhigher and this problem user always connects at exactly 14,400.

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RAS access speed

by mteal In reply to RAS access speed

Thank you to everyone for their suggestions.

The IS manager has given this user a different modem for his laptop (luckily it was separate from the LAN card). This new modem has been able to connect at 33,600 bps.

Perhaps it was a conflict between this brand of modem and the ones used for RAS? Or maybe it was a driver issue? Either way, for now at least, all the RAS users are connecting at acceptable speeds.

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RAS access speed

by mteal In reply to RAS access speed

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