You need ISDN to practice looking at q921 and q931 issues. You will need it
to practice your multilink ppp bundles... You need to be able to configure
switch types, spids, etc. It is not a good idea to get to the lab and see
ISDN for the first time.
You can practice DDR on the modems, but that is not the same as knowing
ISDN.
As for simulating Analog Dial, Teltone makes an analog simulator that sells
used for about $300 - $400. The Teltone ISDN simulator is available from
BigD Communications for under $1700. Take a look on Ebay, you'll see that
these things sell regularly for that price used. Buy it on a credit card,
use it for a few months to practice for the lab, then sell it on Ebay and
get all your money back. All you pay is the finance charge to the credit
card company for a few months. This is a hell of a lot less than you would
pay to rent it for that time period, and considerably less than you would
pay to install ISDN in your home.
Not to mention that as long as the simulator is not defective, it will
always be working when you want to do labs. Try to explain to your telco's
tech support that you are trying to do some practice labs and desperately
need them to repair your downed ISDN service right away! That's IF they even
have tech support at midnight, which is when I usually end up doing labs...
I hope this helps you out.
Z
>From: "Joe Wong" <[EMAIL PROTECTED]>
>Reply-To: "Joe Wong" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Phone line simulator
>Date: Wed, 14 Mar 2001 23:36:47 +0800
>
>I am looking for a phone line simulator to do some dial-up practice using
>modems. I would appreciate any recommendation of model, price and setup.
>And
>I wonder a low cost PABX can do the job?
>
>I ask this because the ISDN simulator is too expensive for me and if I use
>the modem dial-up for practice, will I lose anything that I can't do?
>
>Thanks in advance
>
>
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