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Help with Cable Modem- TROUBLESHOOTING.

the.J129 2,716 2,027 July 19, 2012 at 11:19 PM More Amazon Deals
Another huge Hello to the Tech Gods of SlickDeals. wave

I recently switched to Comcast internet from ATT. I will be paying $19.99/ month for the Performance Internet.

I bought the Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem [amazon.com]and Netgear WNR2000 N300 [amazon.com]

Ever since I got the service, my internet has been giving me problems.
The modem KEEPS resetting itself at random intervals. I could go an entire day without it happening and then it'll happen at night. Yesterday it happened thrice. The day before about 4-5 times.


If you look at a picture of the modem, you'll see 5 icons. Basically, the lights shut off and then blink and come back on. OR the 4th one (that signifies Internet) goes blue, keeps blinking and then resets and turns solid green again.


1. Everytime I call comcast, they can't see anything wrong with my line. Once, this happened twice in a row MadMad and I called comcast and it happened again while I was on hold! By the time I got the CSR, it had already started working..and guess what the CSR said? Yup, everything looked good on their end.


2. I suspected a faulty modem...but here's what's gotten me wondering. Everytime I'm on hold, an automated voice says, "Would you like comcast to send your modem a reset signal?" And when I say, Yes... It says "We've noticed that your modem has already received multiple reset signals...!!!" So maybe it's Comcast that's doing this??!!!


3. Yesterday when I spoke to the CSR, i was PROMISED that it wouldn't happen again! laugh out loud He said that he was going to "provision" the line...what does that mean?
And he said that he's pretty sure that it won't happen again..Well it happened today.
I have decided to get a new modem, and ask Comcast to activate it. If this problem occurs with the new modem too, then I'll be sure that there's NO way that this is due to a faulty modem..and then I can tell them to send a technician over for no charge (the CSR said, he could send one, but it if it turned out to be a problem with the modem, then I'd get charged)


UPDATE- I spoke to Motorola, who were MUCH more efficient and told me to check the upstream power levels..and that everytime they go above 50, THAT's what causes the problem...He said to check the modem stats whenever this happened again, and I'd see that the power levels were crossing 50. And sure enough, that's exactly what's happening! Now I don't know much about this...But I've attached a screenshot, for those that do. What do these figures mean?


I'd appreciate any thoughts/suggestions/ ideas.
And thank you.
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#2
You want a modem from this list: http://mydeviceinfo.comcast.net/

The "DSL Wireless Router" you have is technically a wireless gateway. Which means is is a combination router and modem. In most cases a gateway of this type doesn't have an ethernet WAN interface available meaning you couldn't use it with a cable modem (and in the very unlikely event it does the setup would be harder). Post the band and model if you want to know for sure.

A lot of your other questions should be pretty easy to answer with google searches and reviewing documentation from the manufactures of the products you're looking at.
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#3
Quote from the.J129 View Post :
1. Do I have to buy a modem that is Comcast Approved?
2. If a modem is refurbished, what exactly must have been wrong with it?
3. Simply put, Docsis 3.0 supports faster speeds than Docsis 2.0, right?
4. How different is a regular wireless router from the DSL wireless router that I got
from ATT? Why can't I just plug that into my Cable modem?
1. It is recommended that you get a modem that Comcast supports, no doubt.
2. A refurb could be nothing more than a modem that a customer opened and then returned. It could be a device that has been repaired and tested thoroughly to work and put back on the market. Since refurbs do not always lend towards customer confidence, the prices are usually lower. I would not let a Refurb branding scare you off unless you just want to go with a New, fresh out of the box, model. Some times the price difference isn't even worth going with a refurb and then other times you can save 50% or more for something that is as good as a New model.
3. That is correct! It is the future (at least for now anyways).
4. A DSL wireless router usually has a DSL modem board built into it and is expected to connect to a DSL connection. Most DSL routers can be converted to just a wireless router, while others, not so much. That is not to be confused with a broadband wireless router that can connect to a DSL or Cable service (for authentication purposes, not for picking up DSL or cable signal).
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#4
Quote from menace33 View Post :
1. It is recommended that you get a modem that Comcast supports, no doubt. .

So do you have a recommendation for the wireless router. I'd really like to purchase one today.
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#5
So I've decided on the Motorola SB6121 modem and the Netgear WNR2000 N300 Wireless Router...
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Quote from the.J129 View Post :
So do you have a recommendation for the wireless router. I'd really like to purchase one today.
All depends on your budget, if you want new or refurb or best deal, or a combination of both, and what all do you have on your network currently as far as devices go?
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#7
Quote from menace33 View Post :
All depends on your budget, if you want new or refurb or best deal, or a combination of both, and what all do you have on your network currently as far as devices go?

getting the
Motorola SB6121 modem and the Netgear WNR2000 N300 Wireless Router...


$85 for the modem and $40 for the router. So within my budget. And a good balance of quality and price.


What do you think?
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#8
I love Cnet for their comprehensive reviews on some of the most popular routers. Check out this review of the Netgear WNR2000 [cnet.com] router. I'm not overly impressed with it but I have gigabit network needs but this is a good for-starters wireless N router.

I'm a huge fan of the Motorola Surfboard cable modems and the SB6121 is no different in feeling.
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#9
Quote from menace33 View Post :
I love Cnet for their comprehensive reviews on some of the most popular routers. Check out this review of the Netgear WNR2000 [cnet.com] router. I'm not overly impressed with it but I have gigabit network needs but this is a good for-starters wireless N router.

I'm a huge fan of the Motorola Surfboard cable modems and the SB6121 is no different in feeling.

None of the Cons matter to me, except for the "dual band" thing..what is that?

It's got good range and a good speed. So I guess, I made the right choice.


Thanks anyway!
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Quote from the.J129 View Post :
None of the Cons matter to me, except for the "dual band" thing..what is that?

It's got good range and a good speed. So I guess, I made the right choice.


Thanks anyway!
Means it can transmit on both the 2.4 GHz and 5 GHz wireless bands. Or in this case it only works on the single 2.4 GHz band like most routers.
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Last edited by menace33 July 20, 2012 at 10:41 AM
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#11
Quote from menace33 View Post :
Means it can transmit on both the 2.4 GHz and 5 GHz wireless bands. Or in this case it only works on the single 2.4 GHz band like most routers.

I was reading this :
Quote :
2.4GHz though more widespread in usage (all 802.11b and g devices run on 2.4GHz only) has only 3 non-overlapping channels for transmission, which are crowded due to a lot of interfering devices- other Wi-Fi access points, microwave ovens, cordless phones, Bluetooth devices, baby monitors, etc. all make for a noisy environment which increase interference and degrade the performance. 5GHz channel is much cleaner with less interference with 23 non-overlapping channels- 8 times more than 2.4GHz for transmission, which makes it suitable for applications like Video streaming and Gaming which are very sensitive to packet loss and delays.

How much of this is true?
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Quote from the.J129 View Post :
How much of this is true?
Very true but please know that the 5 GHz band does not have the range as that of the 2.4 GHz and hence why it is more crowded when it comes to wireless internet usage. Just remember, higher the frequency, shorter the range. Higher frequencies don't go through walls as well either (learned that from Sprint ClearPCS way back in the day).
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#13
Quote from menace33 View Post :
4. A DSL wireless router usually has a DSL modem board built into it and is expected to connect to a DSL connection. Most DSL routers can be converted to just a wireless router, while others, not so much. That is not to be confused with a broadband wireless router that can connect to a DSL or Cable service (for authentication purposes, not for picking up DSL or cable signal).
Just to be accurate with the terminology, most dsl wireless gateways can be made to function as wireless access points with built in switches NOT wireless routers. There is a big distinction as the former can't really do any routing.

Some (a minority) DSL Gateways do have a WAN ethernet port or the option to assign ports on the switch to different vlans and make them function as routers without dsl service.
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#14
Quote from menace33 View Post :
Very true but please know that the 5 GHz band does not have the range as that of the 2.4 GHz and hence why it is more crowded when it comes to wireless internet usage. Just remember, higher the frequency, shorter the range. Higher frequencies don't go through walls as well either (learned that from Sprint ClearPCS way back in the day).

And how important is it having a dual band router if there is no other electronic device kept near the router? Does having a dual band truly translate into a better faster connection?
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#15
Quote from the.J129 View Post :
And how important is it having a dual band router if there is no other electronic device kept near the router? Does having a dual band truly translate into a better faster connection?
For short range, yes. Also far less interference than the 2.4 GHz range, however, 5 GHz is really only as good as what separates you and your router. I personally haven't jumped on the 5 GHz bandwagon, but I see its usefulness.
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