Jim,
Thank you for that very clear definition.
The issue though is trying to get a voip line to support an alarm
(which seems to be no issue now) and a postal machine.
Apparently, the postal machine does some special look on the line for
um.........
It doesn't work like a fax or modem. So, it doesn't pickup the line,
look for dialtone and then dial. it apparently picks up the line and
looks for some noise and then initiates communication. All I know is
that it definitely does not work with ata and voip lines. So, I am
looking for clarification so I can get around this.
Thanks
On 6-Mar-09, at 12:34 AM, Jim Van Meggelen wrote:
There seems to be some misunderstanding here.
This is probably the best way to understand a local loop:
The local loop is the pair of copper wires that run between your
premises and the Central Office, through which the carrier delivers
a service. The carriers generally refer to all this collective
copper infrastructure as the Outside Plant. I suppose a local loop
could be fibre as well, but I think most people would be best to
think of a local loop as a copper connection. It is pretty much pair
of wires that run from your premise to the circuit terminating
equipment provided by your carrier (there may be some cross-connects
along the way, but that loop is dedicated to your premises).
- If they connect your local loop up to an analogue card, you get an
analogue line.
- If they connect your local loop up to a DSLAM, you get DSL.
- If they connect your local loop up to an HDSL unit such as a
PairGain, you get a T1.
- If they connect your local loop up to some other thing, you
get . . . um . . . some other thing (I'm thinking mostly of old
services that nobody ever orders anymore).
Traditionally the carriers would--by default--connect copper loops
to analogue circuit packs, and then simply program the circuit up if
you want dial tone. This is why a dead line will often have battery
(which means there is voltage on the line and you can hear sidetone,
but no dial tone). A 'dry loop' refers to a loop that has been
disconnected from the analogue circuit, and not provisioned for any
traditional carrier services. If memory serves correctly, it's
called 'dry' because it's disconnected from the batteries (which are
'wet'). It's really more of a pricing and tariff thing than a
technical thing, since they may not bother actually disconnecting
the wires. The point of a 'dry loop' is that you are having DSL
delivered on a line that would typically also have an analog circuit
on it.
Does that help?
Note: Local Link is a bundle of features that are delivered on an
analog circuit. "Link" refers to the fact that you can press the
"Link" button on old Nortel phones to perform a hookswitch flash.
Local Link service offers all sorts of features that you access via
the "Link" button. Since Bell and Nortel were once the same company,
Bell uses a lot of Nortel-speak. You can also get "Link" type
features on your home phone. Bell just doesn't call that "Local
Link" even though it might be very similar or even identical from a
technical perspective.
Clear as mud?
Jim
Dean Yorke wrote:
Hi All,
I know that this might be a little off topic but.......
Wondering if someone can help me understand the difference between
an analogue line and a local loop line from bell.
we have a couple pieces of equipment, (pitney bowes mail machine
and personal install alarm system) that are having issues
communicating on these lines.
Thanks
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Jim Van Meggelen
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