RCA DCM315R

RCA DCM315R

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Subject Author Date
RCA DCM315R JustMe 09-18-2005
Posted by Bruce on September 21, 2005, 10:28 pm
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>
>> JustMe wrote:
>>
>>> Anyone know what the difference is between a DCM315 and a DCM315R?
>>> Comments
>>> re Quality/performance of the 315R welcome,
>>
>> I haven't heard much good about RCA modems. I'd be going for a
>> Motorola 51xx.
>> My rented Terayon is OK, but haven't seen any for sale anywhere.
>
> OK, thanks Bill
>
>

Over the past six years, I've had 2 (or 3?, can't remember) RCA modems.
All have been rented from @home, attbi, and comcast. None failed, but
were changed out to more current models. I now have model DCM245. True,
there's not much diagnostics software that come with them, but they've
all been rock solid.

Speed tests show that on good nights, I am getting 3.7mbps down, and
384kbps up. This is near the max in my area.

Bruce


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Posted by Warren on September 21, 2005, 10:24 pm
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Bruce wrote:
> Over the past six years, I've had 2 (or 3?, can't remember) RCA modems.
> All have been rented from @home, attbi, and comcast. None failed, but
> were changed out to more current models. I now have model DCM245. True,
> there's not much diagnostics software that come with them, but they've
> all been rock solid.
>
> Speed tests show that on good nights, I am getting 3.7mbps down, and
> 384kbps up. This is near the max in my area.

The RCA modems from the DCM226 and lower are only DOCSIS 1.0, so anything
that old should be replaced on Comcast. The DCM235 is the first DOCSIS 1.1
model.

The most common point of failure on many of the RCA models is the power
plug. Off-hand I can't recall when they stopped using them, but many of the
200's, including the 245, used a Molex-type plug. The jacks were not braced
enough by the case, and a lot of stress was put on the boards they were
connected to. It doesn't take much movement to break the connection, and
cause the modems to go offline.

I had a DCM245 for about four years. It was in an out of the way spot, but
it was getting to the point that a stiff breeze was enough to wiggle the
connection, and take it offline. I replaced it with a Motorola SB5100.

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.
Your guide to Network Television's Fall Premiers:
http://www.holzemville.com/television/fall2005.html





Posted by JustMe on September 23, 2005, 9:46 pm
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> Bruce wrote:
>> Over the past six years, I've had 2 (or 3?, can't remember) RCA modems.
>> All have been rented from @home, attbi, and comcast. None failed, but
>> were changed out to more current models. I now have model DCM245. True,
>> there's not much diagnostics software that come with them, but they've
>> all been rock solid.
>>
>> Speed tests show that on good nights, I am getting 3.7mbps down, and
>> 384kbps up. This is near the max in my area.
>
> The RCA modems from the DCM226 and lower are only DOCSIS 1.0, so anything
> that old should be replaced on Comcast. The DCM235 is the first DOCSIS 1.1
> model.
>
> The most common point of failure on many of the RCA models is the power
> plug. Off-hand I can't recall when they stopped using them, but many of
> the 200's, including the 245, used a Molex-type plug. The jacks were not
> braced enough by the case, and a lot of stress was put on the boards they
> were connected to. It doesn't take much movement to break the connection,
> and cause the modems to go offline.
>
> I had a DCM245 for about four years. It was in an out of the way spot, but
> it was getting to the point that a stiff breeze was enough to wiggle the
> connection, and take it offline. I replaced it with a Motorola SB5100.
>
> --
> Warren H.
>
> ==========
> Disclaimer: My views reflect those of myself, and not my
> employer, my friends, nor (as she often tells me) my wife.
> Any resemblance to the views of anybody living or dead is
> coincidental. No animals were hurt in the writing of this
> response -- unless you count my dog who desperately wants
> to go outside now.
> Your guide to Network Television's Fall Premiers:
> http://www.holzemville.com/television/fall2005.html
>
>
That's pretty much why I had to replace my existing DCM215. I'd had it since
@Home in 1999 and is was restarting 6 times an hour just from me typing at
the keyboard. ISTR the @Home technicians were quite fond of having folks
disconnect the power connector at the back for any little problem. Comcast
techs always asked for a reset using the microswitch in the toothpick hole.

I installed the new modem last Monday but it didn't find the registration
server so I called Comcast. Got a tech in 2 minutes and he forced the
registration from his side and I was up and running in 10 minutes. The tech
mentioned Comcast was moving to 6000kbps service in short order although I'm
still seeing 3800kbps. I haven't had contact with tech support in about a
year but they seem vastly improved. The man I spoke with was competent and
got right to it. No screwing around playing silly games like the script
readers used to do when Comcast took over from ATTBI. They even gave me a
credit for 7 days without asking. All in all. a good experience.




Posted by Andrew Rossmann on September 24, 2005, 10:09 am
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says...
> The most common point of failure on many of the RCA models is the power
> plug. Off-hand I can't recall when they stopped using them, but many of the
> 200's, including the 245, used a Molex-type plug. The jacks were not braced
> enough by the case, and a lot of stress was put on the boards they were
> connected to. It doesn't take much movement to break the connection, and
> cause the modems to go offline.

I've also read a few reports that the power supplies were a bit
underpowered for some. My DM315 is rated for 9-12V@200mA. The supply is
the minimum 9V@200mA. Some had connection problems, mainly establishing
the uplink (when it's doing the 3-bar flash), that was fixed by using a
higher voltage/current supply. I checked mine UNDER LOAD (poked through
the insulation while powering the modem), and it registered around 11V
or so if I remember right, so my supply seems OK.

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.att.net/~andyross


Posted by Bruce on September 24, 2005, 5:07 pm
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> says...
>> The most common point of failure on many of the RCA models is the
>> power plug. Off-hand I can't recall when they stopped using them, but
>> many of the 200's, including the 245, used a Molex-type plug. The
>> jacks were not braced enough by the case, and a lot of stress was put
>> on the boards they were connected to. It doesn't take much movement
>> to break the connection, and cause the modems to go offline.
>
> I've also read a few reports that the power supplies were a bit
> underpowered for some. My DM315 is rated for 9-12V@200mA. The supply
> is the minimum 9V@200mA. Some had connection problems, mainly
> establishing the uplink (when it's doing the 3-bar flash), that was
> fixed by using a higher voltage/current supply. I checked mine UNDER
> LOAD (poked through the insulation while powering the modem), and it
> registered around 11V or so if I remember right, so my supply seems
> OK.
>

True. My DCM245 came with a 9v 800mA block transformer. A few months
later, a box from Comcast arrived on my doorstep, containing a new
transformer, rated at 11v 800mA. A small brochure said that "a limited
number of power supplies may experience weakened performance over time",
but there was no safety risk. "Thompson and Comcast are proactively
implementing a Power Supply Replacement program in order to prevent
interruption of your Internet service due to this circumstance".

I never swapped out the old transformer, but saved it just in case.

Bruce



other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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