 neofateCaveat DepascorPremium
join:2003-11-11
Birmingham, AL
 ·Charter
| reply to bobafett86
Re: [HSI] 2 modems? said by bobafett86:I skipped over the last 6 posts so I hope this wasn't covered. The forward frequencies for the Data Modem and Voice modem are 6 db or one channel away from each other. Helps with the traffic and bandwidth. So that is probably why the two separate devices. Unless the arris is able to run both incoming frequencies. It was covered indirectly as was mentioned that Telephony uses a different network and is otherwise apart from your HSI. It is general knowledge to those who know a bit of how these systems work that Telephony and HSI , in the realms of Charter, are separated completely. To do so, they utilize a different band, and thus frequency(s), to not only keep interference at bay, but to provide the additional Bandwidth in the separate "Channel" for Telephony. Even though Telephony is significantly lower overall bandwidth compared to the potentials of HSI, it uses a decent portion of its allotted bandwidth and somewhat must be accounted for X amount of available bandwidth at all times, a more stringent standard than that of your general HSI Cable Modem. The separate band you speak of provides that, plus they aren't pulling from the same channels available data pool.
As for the capability of the Arris handling both frequencies.. I am fairly certain that this model is a 'Telephony Modem' alone, and does not have the capacity to hold two bands of data at one time. IE: Use the same device, being the Arris, to serve your Highspeed and Telephony at once... Being connected on two different networks, on 4 separate frequencies (2 up, 2 down), to keep them completely apart.
It is designed for Telephony in mind, though is , obviously, a Cablemodem with Telephony subsets/features and ports/software. Similar yet different.
Though of course to place a HSI Cable Modem, and Telephony Modem in one "Box" would surely be possible.. It would just require basically placing the internals of both inside a casing, and having the appropriate ports for all.
However, as was mentioned, Telephone service, by Charter, is intended to be as close to 'hands off' as your typical POTS, or standard land line from a Telco would be. So the separate device implementation is desired for that , among many others already pointed, reason(s).
Bobfett, you make an interesting point about the Bands.. I wasn't thinking of that, but now that you pointed it out, I'm like.. Ah, right.. I knew they operated on different frequency's, though a frequency range can be in the same band.. I would imagine , as you say, the range of the Telephony Modems frequencies is far enough apart to fall into a different channel. (Though still similar to your traditional Cable modem in the general range) -- Up stream in the low end, and Down stream in the higher end.
admiral, and Stivy -- I think , Admiral,.. Stivy is simply trying to make the point that the Telephony modem, while in your house, has nothing to do with your network in any way , shape , or form. It is connected to Charters network via Coax, and your home via a power cord. It shares no wireless properties,.. thus it is not on your network AT all. Furthermore, to monitor the device, you would have to attach it to a network you own, minimally in a single PC-Ethernet platform thus making it part of your network..  --
I've heard both ways of whether or whether the Signal information/diags can be accessed by a modem generated webserver.. and I am now leaning towards the side of that you cannot. I've seen no direct documentation indicating it functions in that manner, as it is not intended to be monitored by the consumer. Though, being on the closed network of Charter Com, it is of course able to be monitored remotely, securely.. IE: From the headend/uBR stats, et al.
On the general side of things -- It is something you are paying for, and it is in your "home", so it is really there for you to do with what you want. Your never gonna be able to be denied access to anything in "your" residence.. It just isn't possible in a court of law. So do with it what you feel you must -- Though I am uncertain of how you are going to monitor the device without placing external equipment between the paths currently in place.. IE: Between Telephony Modem and Telephone Interface, or from Coax to TM. (The latter requiring equipment somewhat uncommon) --
Basically, the TM is going to have similar statistics and signals to your cable modem, and digital channels operating on similar frequencies and modulations. The TM is less apt to have connection issues, though, a large enough RF issue on the Coax will indeed drop the TM as well as the CM. Though if the CM's network is having problems it does not mean the TM's network is having problems automatically.
It sort of runs along the lines of whether home owners are 'allowed' to access the diagnostic pages of their DCT's.. I am completely for people taking a look at the data,.. though I've had a Technician claim that Customers are not *allowed* or *supposed* to access the signal levels.. Then his boss ask me for certain levels off the same piece of equipment.
You are absolutely in the right with the read-only.. If you feel the urge to monitor the information, and can figure out a way to safely/securely do so, then I see no problem.. And your motive is not to change it, nor is it even really easily possible. Though I suppose many can question "why" someone would want to do so -- 
Though, this equipment is not generating traffic that comes into your "HSI" Network, and although it is technically leaving out the same path the "other" HSI data is traveling on (the coax),.. it is for all practical purposes a entirely separate entity, joined only by the same method of travel, being the Piece of Copper/steel in the center of that RG Cable.
Now monitoring the HSI Network is an entirely different ballgame, and I agree with you 100% on keeping your Wireless network secure.
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