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?

Last edited by compu_net on 11-18-04 at 04:57 PM

Report this post to a moderator

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.

__________________
MCSA Charter Member
MCSE Early Achiever
Server+
Dell certified
HP certified

Report this post to a moderator

Thanks for the flood of information

Let’s go further in this matter, if possible

I have a real scenario in my work place

A small network

- 20 Windows XP clients,

- 2 windows server 2003, one of them is configured as RRAS server to accept VPN or any kind of remote access methods,

- All connected to the internet through a D-Link ISDN router, I think model DI-306.

I am trying to establish a Remote Access connection from my home to our work place LAN.

From our LAN I could connect to the RRAS server using VPN, from any client.
But when trying to do that from my home:
First I try to call telephone number of the ISDN router using dialup connection, I received

error 676: the phone line is busy.

Even the router configured to accept dial-in remote access!!!

Could you please share your experience here

I am appreciating any input in this challenge

Thank you

Report this post to a moderator

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.

Report this post to a moderator

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?

Report this post to a moderator

A separate line for dial in users. Yes.

Report this post to a moderator

quote:

---

Originally posted by BearyAnn
A separate line for dial in users. Yes.

---

Report this post to a moderator

It sounds like the culprit is the ISDN modem. Make sure it is configured correctly.

__________________
MCSA Charter Member
MCSE Early Achiever
Server+
Dell certified
HP certified

Report this post to a moderator

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:

Attachment: untitled-1.gif
This has been downloaded 23 time(s).

Last edited by compu_net on 02-24-05 at 10:39 AM

Report this post to a moderator

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.

__________________
MCSA Charter Member
MCSE Early Achiever
Server+
Dell certified
HP certified

Report this post to a moderator