<div dir="ltr">+1 on the splitter. I had purchased one at Radio Shack. When Comcast tech came to my house to check signal he replaced mine for a free Comcast one. He said that not all frequencies went through crappy splitters. Who knows if it is true or not, but it worked after</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 9, 2017 at 2:20 PM, Gary Buhrmaster <span dir="ltr"><<a href="mailto:gary.buhrmaster@gmail.com" target="_blank">gary.buhrmaster@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Mon, Jan 9, 2017 at 7:40 PM, Peter Bennett <<a href="mailto:cats22@comcast.net">cats22@comcast.net</a>> wrote:<br>
> ... I have previously<br>
<span class="">> requested Comcast to send a firmware update to my cable card, and they<br>
> did that immediately. In order to do that I assume there must be a two<br>
> way signal so that the cable card can be located on the network.<br>
<br>
<br>
<br>
</span>OCUR devices (HDHR, Ceton) are Unidirectional (the U) devices.<br>
All the traffic is one way(*). STBs can do a number of things,<br>
including one or two way Docsis communications (DSG), or can<br>
use a return path (typically in the <10MHz range) that allows them<br>
to send upstream data while using a one-way OOB or DSG channel.<br>
<br>
The CableCARD firmware is often sent in the OOB (low<br>
bitrate, low reliability) multiplex that sends the segments of the<br>
firmware slowly but surely (just like the OOB guide data that<br>
slowly, but surely get downloaded, and the code for the STB,<br>
which slowly, but surely, get downloaded. And the mix also<br>
contains the CableCARD maps, and/or authorizations, which<br>
are sent....) This data is sent over and over again (because it<br>
has low reliability), which can take minutes, or even hours to<br>
get all the segments. Once all the required segments are<br>
received, the code is flashed, the maps are updated, the<br>
authorizations are committed. There may be multiple<br>
firmwares, or maps, or authorizations for multiple devices/platforms<br>
being sent all the time, and your device listens for a match on<br>
its infromation (this allows the MSO to selectively update<br>
some devices). If you really want to know the gory details,<br>
the SCTE and CableLabs sites can searched. The details<br>
of the individual segments are manufacturer and software<br>
release specific (not everyone uses the same guide format<br>
for example).<br>
<br>
<br>
<br>
<br>
<br>
(*) Since it is one-way, any CSR that says "It looks good to me"<br>
is misunderstanding what they are looking at. They have nothing<br>
to look at other than that there are host/data/ids in the display.<br>
Only STBs can call home.<br>
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