This is just an FYI...
I have Time-Warner All-In-One for my phone, cable and Roadrunner
services. One of the features available is Caller-ID on TV so you can
see who is calling while watching TV.
A while back there was a discussion about cable amplifiers, splitters
and cable modems. Someone mentioned something about needing 2-way
splitters if you have a cable modem.
While I've never had any problems using off-the-shelf splitters, I
just found out that installing an amplifier between the cable modem
and the digital cable box blocks the Caller-ID feature as well as some
of the On-Demand channels, such as Movies On Demand.
It looks like I'll have to move my amp beyond the first splitter so
the modem cable box can talk to each again.
Each split drops the signal by about 3.5dB. If you have enough of them,
the signal will drop too low to be decoded properly.
You should be able to have a few splitters without needing an amp, but
if you wanted a TV in every room you might need an amp.
Most splitters are 2 way capable.
The amps the cable company uses here have one port that is not
amplified, and does not block the return path. When using cable's VOIP
phone, if the power goes out, that port still passes a signal, letting
the VOIP box run on it's batteries.
Nothing wrong with needing an amp. Not all installs are to 2 TVs 100'
from the pole.
Interesting that caller ID can get blocked by a splitter, while the
rest of the VOIP works OK. One would think that caller ID is just a
small amount of additional digital data sent together with the voice
bits over the same carrier.
On Feb 10, 8:39 am, firstname.lastname@example.org wrote:
I'm not sure which specific post you are replying to, but I don't see
anything in this thread that says Caller-ID was getting blocked by a
splitter. I, the OP, said it got blocked by a amp. I used a standard
off-the-Borgshelf amp. Just so ya know the situation...
You're right, it was an amp. But either way, splitter or amp, the
point is that it seems very strange that either of these would affect
only caller ID on VOIP. One would think that caller ID is just
some more bits being passed along with the voice bits, and not on some
carrier of a different frequency, etc. I would expect if something
interfered with it, you'd have voice problems too.
It's interesting. Just today Verizon in Baltimore started advertising
that if the power went out, their phones still work. I assume they
are talking about real phones (land lines) and implying that
alternatives don't. Yours is the first remark I hear to contrdaict
that. How long has that been true?
Absolutely. If you need an amp to run two tvs, something is wrong,
but not to run 8, like I have. (none bought new. I did buy one new,
but it didn't last long.)
I have 6 TVs/devices that are always connected and 4 other jacks that
occasionally gets used. The picture quality was variable amongst the
Since the problem with the Caller-ID occured, I added another splitter
right after the tap that TWC installed. The digital cable box is
attached to one output and my amp is attached to the other. Beyond the
amp are all the other splitters and devices. All is fine now and even
the oldest $15 garage-sale TV has great picture quality.
Main in - Splitter - one leg to digital box and another to the amp and
There you go. You took the amp out of line with the box, and the boxes
reverse signal is once again talking back to the cable company.
Your amplifier does not pass signals below 40Mhz back up the cable and
was blocking features.
Marketing and scare tactics.
VZ's own FIOS requires a on premises powered, battery backed up box to
keep dial tone up.
Comcast's (&TWC) cable-to-phone box also is powered by the home power
and sports a battery backup. The one in my home has been tested to 6
hours. Standard equipment is 1 battery, it is capable of holding 2
Now, if you are using another VOIP service like Vonage, you are at the
mercy of your Internet connection. Don't know about VZ, but no power
in a cable modem home means no cable modem means no internet.
I do keep the modem/phone box on a UPS, so I'll get about 2 hours of
'net and phone, then the built in battery takes over for the
POTS is powered by the CO, so it will keep dial tone without
commercial power to the premises. And of course, a cordless phone will
go dead in a blackout.
But I remember in my early days of dial up online services (this IS
'The Revenoor Man' of the Prodigy Homelife Board) - the phone line
would rarely stay connected for over 4 hours. One blip and it was
I had the same problem and bought a amp on E-Bay from Cabletvamps. The
one I got was a EDA-FT08100, Electroline. This is bidirectional so
that your Cable modem, and Digital Cable box will work with it. It
cost me about $US 90 bucks ish. You can get cheaper ones with fewer
ports, but you need to make sure it is BI-DIRECTIONAL. Anyway it
worked for me and installation was a 20 mins job. I think the guy is
still there on E-bay. Try typing Electroline or Cable TV Amps.
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