VPN and Your Modems Troubleshooting Guide
Are your Cable Modems supported for VPN Access?
Yes you can use cable modems for VPN access. However you must be aware of the following conditions and be able to work within them.
* Some cable modems require that you log into an NT network to get authenticated.
* Some cable modems use a client similar to the Extranet Client for VPN and both will not run at the same time.
* Some cable modem Contracts/Acceptable Use Policies specify that you cannot use them for business purposes or they want to charge you anther fee to use them for business purposes. Make sure you read your contract thoroughly.
* Your Cable modem provider is your ISP. Please see the ISP troubleshooting guide for more information.
Why does my modem seem to perform erratically?
Always make sure that you do not let the operating system select a generic modem. If required go to the appropriate web site for the vendor of the modem and get the updated INF file so that the proper parameters are configured for the modem.
Why do I always seem to get a slower connection speed than others with the same modem?
1. Always check the modem configuration to verify that its maximum speed has been selected.
2. It is common when auto installing modems that the highest speed is not selected automatically.
3. Do not check the box that says run at maximum speed only.
I plugged my modem into the phone line at the hotel or other Hotspot and now it does not work.
Always make sure that the phone line you are plugging into when visiting somewhere is an analog line not a digital one. Plugging into a digital line can permanently damage your modem, requiring a replacement unit. To avoid these situations please contact the local site phone support personnel.
Why cant I get a 56Kb V.90 connection from some locations that I go to?
Here are some of the reasons why you might not get a 56K connection.
1. You are located more than 3 ½ miles from your telephone company's central office (CO).
2. A SLICK or Subscriber Loop System is used in your area.
3. You are calling from a digital PBX system, which creates a Digital to Analog conversion and then an Analog to Digital conversion.
4. Your line contains digital pads or Robbed Bit Signaling (RBS), which can degrade your connection speeds.
5. Your wiring may be of poor quality.
6. Your modem's firmware may not be up to date. Check that your modem has the newest V.90 code installed with all the patches from the vendors web site.
Why can't I get higher speed on my 56K v.90 modem into some NAG?
Here are some possible reasons.
1. A 56k v.90 modem is asymmetric by design where download speed can be as much as 56k but upload speed will be up to 33.6bps. For 56k to work, there must be only one analog to digital (A/D) conversion in your local phone loop. Thus when modems at both ends are analogue, 56k speeds will never be achieved as most PSTN exchanges run digital routing between the exchanges.
2. Some NAG sites use analog phone lines with Cisco and standard 56k modems, and most PCs' dialups use a similar modem. Between the two modems, it limits the download speed to about 33.6kbps maximum.
3. Also, many users might experience lower connection speeds due to other reasons, such as more poor line quality. These factors will also contribute to the quality and speed of the line.
Yes you can use cable modems for VPN access. However you must be aware of the following conditions and be able to work within them.
* Some cable modems require that you log into an NT network to get authenticated.
* Some cable modems use a client similar to the Extranet Client for VPN and both will not run at the same time.
* Some cable modem Contracts/Acceptable Use Policies specify that you cannot use them for business purposes or they want to charge you anther fee to use them for business purposes. Make sure you read your contract thoroughly.
* Your Cable modem provider is your ISP. Please see the ISP troubleshooting guide for more information.
Why does my modem seem to perform erratically?
Always make sure that you do not let the operating system select a generic modem. If required go to the appropriate web site for the vendor of the modem and get the updated INF file so that the proper parameters are configured for the modem.
Why do I always seem to get a slower connection speed than others with the same modem?
1. Always check the modem configuration to verify that its maximum speed has been selected.
2. It is common when auto installing modems that the highest speed is not selected automatically.
3. Do not check the box that says run at maximum speed only.
I plugged my modem into the phone line at the hotel or other Hotspot and now it does not work.
Always make sure that the phone line you are plugging into when visiting somewhere is an analog line not a digital one. Plugging into a digital line can permanently damage your modem, requiring a replacement unit. To avoid these situations please contact the local site phone support personnel.
Why cant I get a 56Kb V.90 connection from some locations that I go to?
Here are some of the reasons why you might not get a 56K connection.
1. You are located more than 3 ½ miles from your telephone company's central office (CO).
2. A SLICK or Subscriber Loop System is used in your area.
3. You are calling from a digital PBX system, which creates a Digital to Analog conversion and then an Analog to Digital conversion.
4. Your line contains digital pads or Robbed Bit Signaling (RBS), which can degrade your connection speeds.
5. Your wiring may be of poor quality.
6. Your modem's firmware may not be up to date. Check that your modem has the newest V.90 code installed with all the patches from the vendors web site.
Why can't I get higher speed on my 56K v.90 modem into some NAG?
Here are some possible reasons.
1. A 56k v.90 modem is asymmetric by design where download speed can be as much as 56k but upload speed will be up to 33.6bps. For 56k to work, there must be only one analog to digital (A/D) conversion in your local phone loop. Thus when modems at both ends are analogue, 56k speeds will never be achieved as most PSTN exchanges run digital routing between the exchanges.
2. Some NAG sites use analog phone lines with Cisco and standard 56k modems, and most PCs' dialups use a similar modem. Between the two modems, it limits the download speed to about 33.6kbps maximum.
3. Also, many users might experience lower connection speeds due to other reasons, such as more poor line quality. These factors will also contribute to the quality and speed of the line.
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