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Home > Archive > 70-216 > March 2005 > Isdn>vpn
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| compu_net 2004-11-18, 11:38 am |
| For remote access, when saying ISDN, does that mean we use telephone number to connect, and stop using TCP/IP, or that we are using TCP/IP over the existing telephone service?
The reason for my question is that one IT professional told me we can use only ISDN for remote access, without any other technology support!!!
So the client calls remote server using telephone number and that’s all!!!
Think VPN v. ISDN ???
Please, can anybody flood some light here? | |
| curiousgeorge 2005-02-15, 1:55 am |
| that explanation was clear as mud John.
You will still be using TCP/IP as your protocol and you will still be dialing into your RAS server. ISDN, T1, OC48, Cable, or Dial-up are only physical connections that have different levels of bandwidth and different ways of accessing the internet (an "always on" connection or dialing into an ISP).
An ISDN line is digital, while a standard phone line is analog. You must contact your local phone company to have an ISDN line installed. If you have a single line today, or plan to upgrade your second phone line to ISDN, your existing wiring should support ISDN.
An ISDN line consists of multiple channels. Unlike a standard phone line, an ISDN line can carry more than one call at a time, so you can have both your computer and telephone connected to the same line.
An ISDN connection to the Internet uses an ISDN terminal adapter (also called an ISDN digital modem). A standard phone line connects to the Internet with an analogue modem.
Typically, an ISDN line is going to replace two analog phone lines, so if you have a line for your phone and a line for the computer or fax machine, one ISDN line replaces both of those lines.
An ISDN circuit consists of two digital channels, each of which can either be used as a voice call, or a digital computer call. If the 2nd line is not in use on a voice call, both channels can be bonded to provide a single 128 Kb/sec channel.
A 128 Kb bonded channel is about 2.7 times as fast as a perfect analog modem connection, and much faster than that in "real life" applications.
v.90 modems are only 33.6 Kb/sec inbound into the internet, while a 2B ISDN connection is 128 Kb/sec in both directions - so the inbound (upload) about 4 times as fast as a v.90 modem.
Hope that helps. | |
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| BearyAnn 2005-02-21, 3:34 pm |
| Don't know if this helps any, but we used ISDN to connect remote offices to main server. Not used as a dial in from home. It was a direct connection. Had to have a separate modem line for user dial in.
For those with internet connection using VPN is the better choice: no phone lines tied up; several may access at one time. | |
| compu_net 2005-02-21, 4:04 pm |
| quote:
Originally posted by BearyAnn
Don't know if this helps any, but we used ISDN to connect remote offices to main server. Not used as a dial in from home. It was a direct connection. Had to have a separate modem line for user dial in.
For those with internet connection using VPN is the better choice: no phone lines tied up; several may access at one time.
Thanks that flood some light here 
one thing is to use a seprate phone line dedicated for dialIn user, right? | |
| BearyAnn 2005-02-21, 4:05 pm |
| A separate line for dial in users. Yes. | |
| compu_net 2005-02-22, 5:50 am |
| quote:
Originally posted by BearyAnn
A separate line for dial in users. Yes.
but, how can more than one user dial in to the same telephone number?
It should be busy if another user is already dial in, how can I solve that problem?
another thing, in my network place, As I told you, our network connected to the interent using ISDN line and ISDN router, and I have heard that ISDN can accept more than on call at the same time, why that gave me a BUSY signal?
error 676: the phone line is busy.
!!!
when tring to dial in from home!!! | |
| curiousgeorge 2005-02-22, 2:29 pm |
| It sounds like the culprit is the ISDN modem. Make sure it is configured correctly. | |
| compu_net 2005-02-24, 5:34 am |
| quote:
Originally posted by curiousgeorge
It sounds like the culprit is the ISDN modem. Make sure it is configured correctly.
After my highly appreciation for your efforts to help me, in fact I am disappointed 
I couldn't make it work; I give you our infrastructure layout and please give me you proposition so I can access W3k RRAS server: | |
| curiousgeorge 2005-03-01, 2:02 pm |
| The infrastructure setup is standard. You need to refer to the settings on the ISDN router. I am sure they have manuals on the manufacturer's website. If not, call the manufacturer's tech support.
Since you can connect to the server from the LAN but you are not getting your modem to answer a phone call, my best guess is the ISDN router isn't configured correctly. | |
| compu_net 2005-03-01, 4:20 pm |
| quote:
Originally posted by curiousgeorge
The infrastructure setup is standard. You need to refer to the settings on the ISDN router. I am sure they have manuals on the manufacturer's website. If not, call the manufacturer's tech support.
Since you can connect to the server from the LAN but you are not getting your modem to answer a phone call, my best guess is the ISDN router isn't configured correctly.
Well, I am thinking about connecting the RRAS server directly to the Internet using an ISDN adapter, I think that will eliminate the hassle of configuring that D-link router, but I am afraid that will make RRAS server with pare legs to the internet!!!
What do you think?
does RRAS server has a built-in firewall that can neglect the need for that router? | |
| compu_net 2005-03-09, 8:41 am |
| quote:
Originally posted by compu_net
Well, I am thinking about connecting the RRAS server directly to the Internet using an ISDN adapter, I think that will eliminate the hassle of configuring that D-link router, but I am afraid that will make RRAS server with pare legs to the internet!!!
What do you think?
does RRAS server has a built-in firewall that can neglect the need for that router?
I tried to move my RRAS 2003 server to DMZ but after a couple of minutes, told me that it will shutdown in a few minutes , could be WORM??? | |
| compu_net 2005-03-10, 2:21 am |
| Seems to me SLEEPY FORUM: ZZZzzz.......go ahead ZZZZzzzz....... |
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