From: "Ian Chapman" <[email protected]>
Subject: RE: German Return Loss, V.90
No, the line impedance and balance impedance is different in every country.
In many cases the country has two sets. One for short lines (non loaded)
and a second set for loaded (long) lines.
Regards Ian
> ----------
> From: [email protected][SMTP:[email protected]]
> Sent: Thursday, October 08, 1998 9:37 PM
> To: [email protected]
> Subject: Re: German Return Loss, V.90
>
>
> Here's a naive question:
>
> When two countries have specified (as in NET 4) different reference
> impedances for measuring return loss (in a modem), how likely is it that
> the network equipment in one country is actually differerent from the
> equipment in the other country?
>
> Another way of asking might be this: Could it be true that network line
> cards are really 600 ohms resistive worldwide, and that the complex
> reference impedance specified was chosen to approximate the impedance
> presented by the combination of the network equipment and the real-world
> loop? (With the intent that equipment designed to provide a complex source
> impedance would peform better than equipment designed for 600 ohms)
>
> Don
>
> RCIC - http://www.rcic.com
> Regulatory Compliance Information Center
>
>
>
>
