> Within the last couple of weeks, however, two, 2 and a half foot high green
> canisters have cropped up next to my house, with writing on them saying
> something about telephony and broadband (so I'm guessing it ain't the cable
> Are things looking up, or is Verizon just installing empty cans to keep us
> guessing? Checking on their website reveals the sad fact that "Sorry, DSL
> is not available on your phone line yet."
That size can looks more like a cable repeater than a DSL multiplexer.
> I'm generally measured at around 13,000 ft, and it's about 2.8 miles by road
> from the local phone co. outpost. I'm in a relatively new development
> ('93-'94), but the local cabling is no good for DSL, so I'm told. (And not
> much good for analog modems either!)
If the "local cabling is no good for DSL", Verizon has two possible
choices to offer you wireline DSL service:
1) Your copper wiring goes 13 kft all the way back to the central
office. The only equipment in your neighborhood is wiring cabinets.
These are about four feet high, four feet wide and two feet deep with
doors that open up the street side of the box. Verizon could install
another cabinet adjacent to this wiring cabinet and install a DSLAM for
your neighborhood, wired back to the central office on a fiber, coax, or
copper connection from the wiring cabinet. They don't want to have to do
this and so far they haven't.
2) Your copper wiring goes a few thousand feet back to a box called a
"subscriber loop carrier" or "digital loop carrier" box. This box
terminates your neighborhood copper wiring onto a multiplexer that
converts your analog voice signals to digital and carries 24 voice
channels back to the central office on a "channelized T1 circuit". These
SLC/DLC multiplexers have cards in slots that serve one, two, or four
copper circuits. There are a host of old and new vendors offering
Lucent-compatible cards that add DSL to the voice service on a slot-by-
slot basis. The SLC must be one of the newer Lucent SLCs that has a cell
bus as well as a TDM voice bus. The older SLCs cannot be upgraded to
support DSL and the only choice is IDSL (always on ISDN).
This latter option is a great option for offering DSL service to remote
neighborhoods constructed in the last few years that have Lucent SLC-5s.
Verizon has only to replace a card at a time to offer DSL service to a
handful of customers as they sign up. Look for all the phone companies
to begin opening up these neighborhoods for DSL as soon as they finish
evaluating these new equipment options.
See http://www.catena.com/solutions/cnx5/ for an example of a startup
offering these slot card upgrades for the Lucent SLC-5.
Kent W. England, MS MVP for Windows networking