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Re: Remote Access Hardware for Apple/OSX

> From: "Michael G. Schabert" <email@hidden>
> Date: Tue, 20 Feb 2001 10:35:05 -0500
> To: greg <email@hidden>
> Cc: email@hidden
> Subject: Re: Remote Access Hardware for Apple/OSX
>
>>> The reason for this is that 56k modems can only "speak" 56k when
>>> connected directly to a digital line.
>>
>> Just a clarification on this point to be exacting with regard to
>> specifications:
>>
>> I believe Michael was saying that the telephone switching office (Central
>> Office - CO) must have new, fully digital switching equipment and NOT the
>> older analog/relay type switching equipment.
>
> Actually, no.
>
> A 56k modem cannot communicate with a 56k modem at 56k. period. In
> order for your ISP to have a 56k dialin, they have a bank of special
> devices which must be digitally connected to the CO.
>
> If you have an ISDN line, & your friend has an ISDN line, & you each
> connect up a 56k modem to the POTS jack, you've got about the
> cleanest signal you can get, & you're guaranteed that the CO is
> digitally switched...but the modems will STILL connect to each other
> at 33.6k.

Agreed, but see below has to what I was trying to say.

> When you use a 56k modem, your signal is analog...when it hits your
> CO, it becones digital. In order for 56k technology to work, it can
> NEVER go back to analog, it must stay digital when it goes to the
> recipient's CO, it must stay digital when it hits the recipient's
> building, & it must stay digital when it hits the receiving "modem".
> Another 56k modem can only speak analog, so it can't work as the
> receiving modem, at 56k.
>

Which is why you need an ISDN modem on the answering end(to keep it all
digital). Here is a blurb taken from
http://www.usr.com/products/business/business-product.asp?sku=000698-13

---------
The award-winning Courier I-modem with V.Everything is the easiest way to
move up to ISDN speeds while keeping seamless analog connectivity. In server
mode, capable of sending at up to 56 Kbps and receiving at up to 31.2 Kbps.
In server-to-server (symmetric x2(tm)) mode, can send and receive at up to
56 Kbps or 64 Kbps. Actual speeds you experience may be lower due to varying
line conditions. Maximum sending speeds (in server mode) in the U.S. and
Canada are limited to 53K, due to regulatory limits on power output.
Requires compatible phone lines and client modem.

---------

If you are going to have a large # of dialup lines then you probably want to
go with some kind of WAN access device, check out Lucent's MAX TNT as an
example.

I do not use or endorse any of the above products. I use my the an internet
& local ISP for my corporate WAN access. Not the best idea for security but
it works, I will need to change this is X coming up. X is a much bigger
security problem due to its Unix heritage, but I love it.

Paul Bucher
Mount Joy Wire Corp

References: 
 >Re: Remote Access Hardware for Apple/OSX (From: "Michael G. Schabert" <email@hidden>)



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