On Fri, 15 Jul 2011 14:39:02 -0700 (PDT), "email@example.com"
>Doesn't the cable company traffic shape?
Nope. The business router doesn't even give you access to the config
pages. Traffic shaping includes limits and quotas for individual
users. None of the ISP's do that. You have to do that yourself in
Comcast doesn't do prioritization for their own business VoIP traffic,
because they don't need to do it. They have a completely separate RF
channel for the business VoIP traffic, so none of the other data or
video traffic will interfere. I'm not sure if the home VoIP routers
work the same way, but I suspect they do as the audio is quite good.
>It may be a decent 7mbps of
>DSL is better than a traffic shaped cable.
Maybe, but it really depends on how it's setup and configured. There
are other oddities with cable that seem to cause problems. I have a
neighbor who went cheap and got Comcast 1Mbit/sec cable service and
two phone lines on an Arris modem. It's amazing to watch how the data
arrives. Instead of slowly dribbling in at 1Mbit/sec, as one would
get with 1.5Mbit/sec DSL, it comes in bursts. The peak rate is
probably 20Mbits/sec, but there are huge gaps between bursts. Click
on a web page, and nothing happens for about 3 seconds, then the whole
page paints at once. It's not horrible, but it does take some mental
The Comcast VoIP part is fine with no perceptible jitter or garble.
That's because it's on a separate RF channel and the regular cable
data doesn't interfere. However, when I tried to use Skype or my SIP
phone on the 1MBit/sec cable side, the MOS score was horrible, and
there were constant dropouts.
>Plus from the people I know
>with cable, it doesn't seem all that reliable. Lots of modem booting
Ahem. I have about 5 customers with Comcast business telephone
service and at least 5 more (too lazy to count) with home "Triple
Play" VoIP service. The business service comes with a UPS and never
seems to require a reboot or power cycle. The Arris modems used in
the home service can be made to hang by a power glitch, but are
generally more stable than my DD-WRT installations. The only surprise
was a phone call from one of the home users last weekend. No matter
what he did, he couldn't connect. I finally determined that Comcast
had swapped routers on him, and copied over a stale ARP table. All he
had to do was unplug the cable modem for about 15 minutes, let the ARP
table entry expire, and it worked.
I won't say anything nice about some of the local Comcast cable plant,
equipment, backup systems, and overloading. However, that's variable
and depends heavily on local policies and equipment. If you live in
the trees, like I do, things invariably fall on the cable.
Incidentally, that was fixed the day after I reported it.
>Or are you comparing business grade services?
Yep. A Coffee Shop is a business last time I checked. Comcast will
not install home service in a business address.
>I am amazed at the number of Asian women I see watching what looks
>like Asian soap operas on their notebooks at Starbucks or Peets. I
>assume they are streaming it, but I never bothered to ask. If you ever
>messed with FTA, it looks like that kind of programming.
I've done FTA (free to air) and SCPC (single channel per carrier)
audio satellite, as well as the usual DBS (digital broadcast
satellite) stuff. What bugs me about some coffee shop systems is that
I see high levels of traffic, but nobody seems to be doing anything
with the laptops. Sometimes some email or social network pages, but
not much else. Locally, lots of people filling out online forms and
applications. I've never seen anyone watching a movie. I should
check the traffic mix, but since nobody is complaining, I won't
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# http://802.11junk.com firstname.lastname@example.org