"Cable mile" or "cable foot" is traditionally used to refer to the length of
the (copper) local loop. In the days when all loops originated at the
central office, the cable distance could never be less than the
as-the-crow-flies distance or the along-the-streets distance. But, as AG
notes, the loop these days may start at a DLC or "remote" that is connected
digitally - wire or fiber - to the CO from somewhere in your neighbourhood.
The local loop proper starts at your neighbourhood DLC/remote, and
consequently can be very short even when you're far from the CO.
But, as AG also notes, the technique to carry and multiplex the signals from
CO to remote may constrain what dialup rate you can get. The physics of
getting high data rates out of copper simply don't apply over these
multiplexed digital lines.
Michael
On 1/18/11 10:04 AM, Charles Geilfuss wrote:
> You'll have to explain that last sentence to me Ken. Are you guys using
> wormholes now?
>
> Charlie
>
> On Tue, Jan 18, 2011 at 10:00 AM, Ken Norton <ken@xxxxxxxxxxx> wrote:
>
>> I agree with Chuck. However, it is possible to now get broadband up to
>> about 100mpbs. And amazingly enough, we can actually do that over
>> copper. (short distances).
>>
>> The 54mbps connection was strictly the wireless network. Internet
>> connection was limited to what the DSL purchase speed is.
>>
>> Now, to your specific speed issues at the house. I would make sure
>> that your computer with the dial-up modem is connected to the phone
>> line through the DSL filter. That MUST be on the wire that is plugged
>> into your computer.
>>
>> As to speed differentials, that has a lot to do with line-pairing
>> technologies. We use "carrier systems" which take many phone lines and
>> deliver them to an area over just a couple of pairs. Unfortunately,
>> some of the earlier systems placed limits of around 33 kbps on the
>> ciruit.
>>
>> It is impossible to predict where you might be on a carrier system or
>> a DLC (digital loop carrier) based on distance from the primary phone
>> building. Our networks are a spiderweb with lots of twists and turns
>> that follow old growth patterns of the city. It is not unusual for you
>> to be literally next door to the central office, but be one or two
>> cable miles away from it. Yet, on the flip side, you can be miles from
>> the central office, but be within 500 cable feet from it.
>>
>> AG
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