Comments on: Cable Modem Troubleshooting: RCA DCM425

By: Islam Khalil

Islam Khalil — Sun, 13 Sep 2009 10:13:41 +0000

Dear sir,
i have rca router and i wanna to setup wirless network as i have likesys modem but when i plug cabel with pc all does not work pls advise what should i do to setup all

By: nebula1902

nebula1902 — Sat, 05 Sep 2009 15:09:37 +0000

I have RCA – model 425 with TW cable but I can’t connect on network, cable link led is flashing non stop, and all other are on all time. What now?

By: ruben bello

ruben bello — Wed, 17 Jun 2009 13:37:18 +0000

cual es la pagina de diagnostico de los modems d-link

By: Phil

Phil — Fri, 27 Mar 2009 19:18:06 +0000

Hey not COMCASTIC fellow,
I can tell you a few things that might help –

Forward:
Signal Acquired at 711.000 MHz
SNR: 39.5 dB
Received Signal Strength: 0.4 dBmV
Bit Error Rate: 0.000 %
Modulation: 256 QAM
This is the signal coming TO your modem. 711MHz is channel 11o. SNR is great. The problem is on your return, and you can help that by eliminating the split.

Return:
Connection: Acquired
Frequency: 29.6 MHz
Power Level: 55.2 dBmV
Channel ID: 11
Modulation: 16 QAM

The return is how you upload back to the cable co to ask for webpages, etc. The frequency ranges from 5 -40 MHz, with the 5-20 never being used because of noise. The power level is the amount of power your modem has to put back out to get to the headend at the requested level (usually zero db). Most modems shut off and reset at 60dBmV and try to re-acquire. You need to reduce that to 45-50 to keep a stable online connection. Each 2way splitter is -3.5db, so if you had the 2 way right where the cable comes in and the modem off one and the 3 way of the other, that would get you at least 3.5 bringing that 55.2 to 51.7. Some 3-way splitters are -5db so you might get it down to 49. If that doesn’t work, call it in.

I just wonder where you got those numbers from an RCA modem.. Motorolas have the interface to do that, but I dont know about the RCA.

By: Angelo

Angelo — Thu, 19 Mar 2009 21:51:36 +0000

hey, i’m trying to port forward and i can’t get the password. I enter my Default Gateway into the browser and it just asks for a pass. I have tried admin and other password that might work. None of them are good. Does anyone know how to change the password or what the password might be besides admin?

By: Juan

Juan — Thu, 19 Mar 2009 18:10:37 +0000

javier mira, te cuento que hay programas en la red en lo que puedes buscar desde google para cambiar tu ip, hasta cambiar la mac de tu equipo que, asi podrias conectarte y bajar TRADICIONALMENTE l=prograsmas o cosas desde esos servidores, porque lo mejor y automatizado que puedes hacer es bajarte un programa que se llama jdownloader, es hecho en java y te da laposibilidad d q ingreses tu link y lo pone en tu lista y lo baja a la mayor velocidad posible y sin que te pida otra ip, eso si, si son muchos links, andate a dormir y a la noche siguiente los tendras todos listos,…. miiiiles de links los puedes hacer..
saludos manager@devcomputer.net

By: javier

javier — Thu, 19 Mar 2009 04:32:54 +0000

hola q tal? paso a contar mi problema yo tengo el mismo modelo de modem pero quisiera hacer una consulta se puede cambiar la direccion de ip del modem? la verdad no tengo ni idea sobre esto lo que pasa es que quiero bajar musica de rapidshared o megaupload pero no puede siempre me aparece error y me aparece mi direccion de ip fija creo que es por esto que no puedo bajar mas por la ip hay alguna forma de cambiarlo??? desde ya gracias….

By: Juan

Juan — Sat, 14 Mar 2009 11:22:44 +0000

solution!! ok guys , i was working in the office whit these modem and Broadband router cisco, ok, the first thing if the modem don’t not recognize you router and freeze the internet you need assign a mac direction in the router because the modem read ONLY one device o computer, and then turn of the modem and the router, plug first the mode,, wait 5 secinds plug the router, and then the modem read the device with MAC address and the router read the IP direction and then the router assign direction DHCP to the devices plugged s in there….
ir you have some question my email es manager@devcomputer.net

By: it IS NOT comcastic...

it IS NOT comcastic... — Sat, 14 Mar 2009 05:08:18 +0000

Comcast, Indiana – This modem didn’t work from day one. When I first got it, the 1st two lights would come on and flash but it wouldn’t go any further. After 2 days on the phone with customer support a tech was able to get into my modem remotely and update a boot file or something that he said was bad. After that, the modem would connect and I was finally able to get online as long as I didn’t have a splitter branching off to my TV. Then later on the same night I rebooted my computer for something unrelated and now my modem won’t stop re-connecting. Once it connects everything seems fine but the connection only lasts for a minute or two and then it resets. I really wish I had one of the older Motorola modems they were using last year

I’m a little confused why I’m not able to get a signal at all when I hook my TV up though… here’s the wiring layout:

|—————–[my tv]
|———————————[2 way split]——–[modem]
service in—–[3 way split]——-[other TV(s)]
|—————–[other TV(s)]

if I take out the 2-way and go directly to my modem I can get a signal (but the modem still drops & reconnects almost like clockwork).
Here’s the stats from my diag page:

Forward:
Signal Acquired at 711.000 MHz
SNR: 39.5 dB
Received Signal Strength: 0.4 dBmV
Bit Error Rate: 0.000 %
Modulation: 256 QAM

Return:
Connection: Acquired
Frequency: 29.6 MHz
Power Level: 55.2 dBmV
Channel ID: 11
Modulation: 16 QAM

does that mean anything to any of you guys?

By: juan

juan — Fri, 06 Mar 2009 20:36:40 +0000

ok guys im working may be 1 week in one store whit this fuqin modem, ok
i search the principal things of this modem and my conclusion is
the modem read just one computer, ok, if you conect the modem w/ a router The router by default dosent have mac address so you need put one mac addres, and conect you computer to this router, this computer NEED have the same mac of the router and you have conecion, ok and the coneccion stiil working know….
let me tray another computer whit the SAME mac address…

By: cm

cm — Tue, 17 Feb 2009 01:46:01 +0000

answer to # 12

switch off computer, router and cable modem

plug modem into router WAN, plug computer into one of the router ports

power up modem, wait a minute

power up router, wait a minute

power up computer

Voila!

By: Tom Los Angeles

Tom Los Angeles — Sun, 15 Feb 2009 01:43:34 +0000

I’m about ready to throw my phone against the wall!!! Today I’ve spent over 1 hr talking and going through the stupid prompts to speak to someone. My RCA DCM425 will not stop rebooting. I am now on my second RCA modem and had the same problem with the one prior to the RCA series im using. The tech came out the same day and sure enough, it was working when he got here. Now it’s back to the same. Anyone interested in learning how to start an internet business that isn’t run by a greedy corp? Let me know!

By: modem or router

modem or router — Wed, 19 Nov 2008 19:40:23 +0000

TWC-NY .. for the past week, my wifi and even wired ethernet connection has been dropping and reconnecting. I finally got sick of it and decided it may be glitches in either mdeom or router or both and decided to reset it both by unplugging the pwr cord and re-pwring it.

to my demise, now my connection is just completely dead, even thru wired ethernet. My modem doesnt seem to be communicating with my router at all and the “PC Link” light is just dead. I thought it may be have been my faulty router all along and it finally crap’d out after the pwr reboot so i pulled out my old ethernet router to test. wiht my old router, the PC Link light would blink only if i power on my router after my modem, but not vice versa.. but regardless of the PC Link being on and blinking, there is still no connection via ethernet cable.

TWC CSR are very little help, if any at all… naturally they blame it on the router if the modem works fine thru direct ethernet connection from modem>comp. but how can TWO working routers suddenly STOP working? ethernet cables have been tested to work, so thats not the problem. Seems to be is issue w/ the modem now suddenly refusing to communicate thru routers. So ofcourse i ask about TWC’s wireless modem. Sales rep says it’s 5.95$ extra per/mo with EACH computer setup @ 50$ or so… and said Im not allowed to just rent and install myself, they MUST install on every computer for me. I asked how exactly are they going to install the wireless connection if one of my desktops isnt currently equuiped w wifi, or if they were going to use wifi cards on every PC/Laptop I have, she repeatedly told me, i dont have to worry about that, they’ll handle everything

i even specifically asked if twc recently updated their modem software to no longer communicate with 3rd party routers and she answers “no, we don’t do that” .. .. but what is any of it worth?.. as anyone who’s familiar with CSRs, they are either clueless, misinformed, making up BS as they go, or flat out LIE to you.. hardly will u find a CSR that is actually helpful on their own, usually, we have to help them help us..

By: ixis

ixis — Fri, 07 Nov 2008 09:03:52 +0000

same problem with me. modem would be working fine. then all of sudden, all the lights would go out. only internet light would be blinking. Then it would work again if i just restart the modem, then it would go off again. now i am removing the splitter and connect the modem directly to wall jack see how it goes. this is just so annoying.

By: new TW cust

new TW cust — Tue, 07 Oct 2008 00:47:06 +0000

Im a new customer of TW using the modem(RCA DCM425 modem) they provided , the tech went to our house and install the modem all works well but after 1hour when tech is gone my internet loss connection , i call back the tech but says all is working fine b4 he left , so i troubleshoot myself , well this might help some folks out there ,
I found the problem is on the 8db attenuator the tech connects to my modem he says its filter the signal goin to my modem but the problem is once the connection is loss it cant connect automatically unless you remove the attenuator and put it back again once the connection normalized.
I never put back again the attenuator , works fine now.