| Author |
RAS will not connect faster than 28.8kbs
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| jayjay22 2003-04-07, 2:17 am |
| I have Windows 2000 server (sp3) installed on a server. RRAS is installed
on this server, and licensing is activated. I have 2 56K external modems
attached to the server. Whenever someone dials in and connects to the RRAS
server via modem, the maximum connection speed obtained is 28.8kbs.
I've tried attaching 2 different models of 56k external modems, and still I
only get a 28.8kbs connection. I've moved the server to another location to
use a different phone line. The phone line at this location can connect to
other computers at 50 - 53kbs. When I dialed in to the server, attached to
this phone line, I again only get a connection speed of 28.8kbs.
How do I get RRAS to connect at speeds greater than 28.8kps (the maximum
speed the modem and phone line will support)?
Thank you,
Jay | |
| dogzpaw 2003-04-07, 3:32 am |
| Sounds like a multilink issue(?)
Does your ISP support multilink? And have you got it enabled on both machines? | |
| enforcer 2003-04-07, 11:35 am |
| check the max speed of the com ports, sometimes these are set too low. | |
| sanjbatra 2003-04-07, 12:29 pm |
| See if there are any other items connected to the problem phone line. Each extension and item attached will sap a little of the available bandwidth (whether active or not).
e.g. if you have a phone or fax connected but not being used, you will get a decrease in modem speed.
Hope this is clear.
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| Alexfine 2003-04-07, 12:55 pm |
| Your modem can't initiate V.90 protocol so connect can't be more than 31.2Kbps. I had the same problem and on the another forum fellows told me that "to enable this feature You have to connect modems to Cisco equipment The RRAS does not support V.90 protocol..." | |
| jayjay22 2003-04-07, 2:55 pm |
| Hi all,
I don't believe multi link to be the issue, as I'm only taking inbound calls to the modem one at a time (ie - I am not binding two phone lines/modems to achieve greater speeds).
I have checked the port settings, and they are set the speed 115200. Setting the speed to 57600 made no difference.
Connecting the V90 to modem to Cisco equipment in what way? I not sure what you mean. What you are describing is exactly what I'm experiencing. How did you resolve it?
Any other ideas?
Thanks,
Jason | |
| sanjbatra 2003-04-07, 3:02 pm |
| Check the line with your telco !
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| dogzpaw 2003-04-08, 2:39 am |
| See if you can get your phone company to test the problem phone line that you are using at the moment.
Analogue lines can degrade over time - weakening the signal.
Ask them to turn up the gain on your line(if they can)to see if this makes a difference.
Otherwise, how have you got RRAS set up? | |
| stepfaul 2003-04-08, 7:28 am |
| below may be of interest :-
Cannot Connect to RAS Server at 56 Kbps
The information in this article applies to:
Microsoft Windows NT Server 4.0 Terminal Server Edition
Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Professional
Microsoft Windows NT Server 4.0
Microsoft Windows NT Server, Enterprise Edition 4.0
Microsoft Windows NT Workstation 4.0
Microsoft Routing and Remote Access Service Update for Windows NT Server 4.0
Microsoft Windows 95
Microsoft Windows 98
This article was previously published under Q244390
SUMMARY
A Remote Access Services (RAS) server may not answer at 56 Kbps. You may get a connection at 28.8 or 33.6 Kbps.
MORE INFORMATION
This behavior can occur because standard analog phone lines are not capable of supporting the 56 Kbps standards. A digital line and special hardware is required to achieve a 56 Kbps connection.
The following three criteria must be met before a 56 Kbps connection succeeds:
A digital circuit is required at one end and the modem must be digital.
V.90 support is required at both ends.
There can be no more than one analog to digital conversion in the path between the modems.
REFERENCES
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. | |
| Alexfine 2003-04-08, 1:37 pm |
| I mean the same as stepfaul
A Remote Access Services (RAS) server may not answer at 56 Kbps. You may get a connection at 28.8 or 33.6 Kbps.
MORE INFORMATION
This behavior can occur because standard analog phone lines are not capable of supporting the 56 Kbps standards. A digital line and special hardware is required to achieve a 56 Kbps connection.
The following three criteria must be met before a 56 Kbps connection succeeds:
1. A digital circuit.
2. Two modems with V.90 support.
3. Special hardware at Tthe RRAS end. | |
| chodan 2003-04-12, 8:50 pm |
| quote:
Originally posted by Alexfine
I mean the same as stepfaul
A Remote Access Services (RAS) server may not answer at 56 Kbps. You may get a connection at 28.8 or 33.6 Kbps.
MORE INFORMATION
This behavior can occur because standard analog phone lines are not capable of supporting the 56 Kbps standards. A digital line and special hardware is required to achieve a 56 Kbps connection.
The following three criteria must be met before a 56 Kbps connection succeeds:
1. A digital circuit.
2. Two modems with V.90 support.
3. Special hardware at Tthe RRAS end.
You are correct
56K connection speeds are acquired on v.90 modems by having the ISP use a PRI ISDN circuit as the connection to the POP "point of presence" or in other words the local phone office, the ISP must use digital modems connected to a 64K ISDN channel which is then shipped to the phone company who in turn places it on the PSTN or "public Switched Telephone Network" which in turn ends up at your V.90 modem.
This is a one way proccess and it requires this type of setup, which means upload speed will still only top out at 33.6.
So when 2 v.90 or v.92 modems connect they don't get the advantage of a digital modem on one end so it is 33.6--><--33.6 max throughput.
28.8 connect speeds might be improved to 33.6 by setting compression or something like that maybe.
Does this help?? |
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