MicroCell
™
Informational Document for
Technical, Operational, and Troubleshooting Issues v1.7
by Otto Pylot
Page 6 of 23
OpenBSD 4.9 router notes: for those of you who use OpenBSD, some issues
have been reported when using the 192.168.100.0/24 subnet. You may want
to try 192.168.1.0/24 and see if that corrects the problem.
U-Verse Basics:
AT&T’s High Speed Internet Access (HSIA) service is either ADSL2+, which uses
your existing copper-based lines, or VDSL, which is a combination of fiber and
copper, to bring HSI to your premises. The use of either technology is dependent ,in
part, on what is already in your existing neighborhood or what AT&T (or another
provider) has upgraded the neighborhood to.
VDSL is distance limited like DSL, but uses a fiber optic connection part of the way to
increase speed and bandwidth. The final connection to the premises (last mile) can,
and usually is, over the existing copper lines.
FTTN - Fiber To The Node (or Neighborhood), FTTP - Fiber To The Pole (or
Premises), FTTC - Fiber To The Curb, or FTTH - Fiber To The Home, are all methods
of delivering VDSL to the home, and all depend on some sort of neighborhood box
called a VRAD (Video Ready Access Device). However, the VRAD is more of a rack of
cards that provide connection to the home than it is a “device”. The cards could be
for fiber connection or different versions of VDSL2 connection cards.
Running fiber from the CO (Central Office) to the VRAD isn’t cheap, and neither are
the VRAD’s, so that’s why some neighborhoods don’t have VDSL service because it
all depends on what kind of ROI (Return On Investment) your particular service
provider expects and if deployment is cost effective.
Either type of service works well with the MicroCell. But VDSL is a bit more
tempermental and less tolerant of line faults like bridge taps and AM
interference, and thus is a bit more difficult to get installed correctly for the
MicroCell.
The RG (Residential Gateway) chosen is dependent upon the type of VDSL that you
have and the distance from the VRAD. A bonded pair connection is used if your
premises is between 3000’ and 5500’ from the VRAD (that’s cable length) or a single
bonded pair is used if you are 0 – 3000’ from the VRAD. The distance determination
is totally up to the discretion of AT&T.
ADSL2+ modems won’t work with VDSL2 connections and vice versa.
As of this writing, the RG’s installed for U-verse services are:
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