Thanks and a question on modem speeds (was Re: [Lvlug]
BitTorrent-Able to upload behind a NAT box?)
thehead at patshead.com
Thu Dec 22 10:14:32 EST 2005
Randy Kramer wrote:
> Re: "the line is clear both ways": why wouldn't it be? I mean it's my
> dedicated phone line (pair) (but more below).
A line can be more clear in one direction than the other. I suppose you
can think of it this way. If you have a noisy piece of wiring at your
house, that noise is introduced into the signal very early on in your
transmission. From the other end, that noise is introduced very late.
>> > v.90 only transmits downstream at 56k (53k :p). Upstream is limited to
>> > 28.8 or 33.6.
> But, is that simultaneous--I mean is my total bandwidth (in that case) 86.6 k
> (53 + 33.6)?
If you want to measure it that way, yes. You don't say a T1 is 3 Mbps
even though it is full duplex 1.5Mbps.
Technically the 53/33 Kbps is full deplex, too. Both ends always
operate at their maximum speed.
> Aside: RCN provides my telephone service. About a year to year and a half ago
> (iirc), they came around and made a change to my phone lines. Prior to that
> change, the best connection I could ever get (even with a 56 k modem) was 33
> k--recently, while working on a computer for someone else, I tried out their
> modem and got a connection somewhere in the 40s (don't recall if it was 41 or
> Anyway, RCN's change was to, at the little box outside the house, disconnect
> me from the dedicated pairs going back to the central switch and instead
> install some sort of adapter to connect to the TV cable coax. I suspect that
> it uses VOIP or some variant thereof. So, inside my house I have standard
> phone lines, at the interface box it switches to VOIP, and, overall, I have
> better phone lines than the dedicated pairs I had before. Interesting.
This is interesting to hear about, since in the past I have worked for 2
different phone companies that provided dialtone. If they are using
voip, or some variation, I wonder how much bandwidth they have to supply
to allow you to connect at 40k+. I suppose it really doesn't matter,
cable companies have plenty of bandwidth to spare on that coax.
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