Although this isn't specific to PortMasters, most of the people =
here are
ISPs, so here goes...:-)
Has anyone here heard of something called "AML Carrier"? We had =
been
introduced to the concept of running pairgain on the telco's end a =
while
back (someone on an ISP list mentioned it; it's basically the idea =
of a
telco essentially running multiple connections over a single =
physical
wire, or similar to that effect), and so we asked one of our =
telco's techs
about it. He said there was nothing like that, but they used =
something
similar called AML Carrier...can anyone here shed a little more =
light on
this? (The tech was basically clueless; he didn't know much beyond =
that.)
In a similar vein, we're looking to "educate" ourselves a little =
more
about the telco's end of things; are there any online resources or
literature that anyone would recommend regarding the life 'n times =
of
telcoland? :-)
-- = .-------------------------------------------------------------------= ----------. | Edward S. Marshall <emarshal@common.net> | CII Technical = Administrator, | | <http://www.common.net/~emarshal/ | Vice-President, = Common Internet | | Finger for PGP public key. | Inc, and Linux & = LPmud (ab)user. | = `-------------------------------------------------------------------= ----------'
AML's (sometimes referred to as SLC-2's) are an analog pair gain = system (manufactured by Reliance Comm-Tech...now R-Tech I think) = used to derive another channel off of a single pair. They were = introduced in the mid 70's if I remeber correctly. The only place = I know of in USW territory that they are still used is Washington = state. The techs liked them because they can get a second line = into somehwere without having to use another drop.=20
AML's are old technology. They use frequency division = multiplexing. There is a physical channel and a derived channel. = The physical channel uses the 300 to 3000hz range and the derived = channel uses an AM frequency. The batteries in the remote unit are = charged when the derived channel is off hook. They run into = problems when they are used for high use lines, because the = batteries don't get charged. The physical channel works all the = time, because it uses the physical wire just like a regular POTS = line.=20
The tech may also be referring to a UDC (Universal Digital = Channel). These are the new "AML's". They use time division = multiplexing (they run 2B1Q between the remote terminal and the = office) to create 2 POTS channels over one pair.
I would ask some more questions.
Kyle Platts=20 CSS-Tech=20 !NTERPRISE Networking Services