Cable Modem Troubleshooting: Scientific Atlanta DPC2100

by Ross McKillop on July 17, 2006

Cable Modems

Light patterns, images, manuals and more helpful info for the Scientific Atlanta DPC2100 cable modem -

click to enlarge
click to enlarge (and animate)
Manufacturer: Scientific Atlanta Model: DPC2100
Modem Light Indicators
PC Flashing - data being transferred between the PC and the cable modem
Solid - indicates Ethernet/USB carrier is present
Cable Flashing - modem is scanning the network and attempting to register
Solid - modem is acquired
Send flashes in sync with data sent from the cable modem to the network
Receive flashes in sync with data received from the network to the cable modem
Power Solid - power is being applied to the cable modem
Notes and Useful Information

Installation and User Manual
Manufacturer Website
Manufacturer Product Page

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    { 72 comments… read them below or add one }

    1 ERIC 08.19.06 at 5:41 pm

    HOW DO I CONNECT TO THE INTERNET USING USB

    2 Ross 08.19.06 at 8:27 pm

    Eric,

    If this is your modem (the Scientific Atlanta DPC2100) you should be able to plug this modem, using the USB c able, directly into your PC. If you’re using Windows, it should prompt you to install the modem - use the CD that came with this modem.

    USB connections can be a bit ‘flakey’ at times - if you’re currently using this modem via an ethernet cable, and it works, you may just want to leave it as it is (if it’s not broken, don’t fix it :) )

    3 Steve 10.12.07 at 8:06 am

    Is there a way to complete turn off power to the modem? I unplugged the power source and there are lights still blinking at a 10 second interval.

    4 Alan 10.22.07 at 1:40 pm

    Hi there, I have a Atlanata DPC2100 connecting a cable broadband internet service via ethernet cable to my computer.

    I want to set up a wireless network.

    does that mean that the 2100 becomes obsolete or do i connect something else to the 2100 to achieve this.

    this information is completely lacking in the 2100 guide and instructions. thanks.

    For a computer idiot this question should be answered in youe advice, dont you think, because its the first thing that someone wants to do after their internet provider has fobbed them off with a non-wireless set-up!!!!

    5 Jim 11.11.07 at 2:21 am

    I’d appreciate if somebody could answer this question. I have an atlanta modem and it seems to work fine but the PC light is either flicking all the time while it’s connect or the PC light is not on at all. What does this mean? Is there a connection issue?

    Cheers. :)

    6 Al 11.14.07 at 9:13 pm

    I have recently installed this type of cable modem. I have Cox supplied internet. I can not always get on the internet without having to unplug the power cord or cable. It tells me I have limited or no connectivity. What could possible be the problem?

    7 TJ 12.11.07 at 3:16 pm

    hey i have this same modem thing and i plugged it into my usb and it WAS working and i had to re install the computer and when i updated everything and plugged it in it keeps saying unknown device. it wont let me install any drivers for it except a driver called “unknown device” can someone help me out with this?

    8 edwin 12.13.07 at 6:59 am

    iam haveing trouble in
    stalling the ethernet.
    it’s giveing me err code 28 no drivers were do i get driver’s

    9 MaT 12.25.07 at 11:05 pm

    I agree but between the router and the modem …try to set it up yourself.. and you’ll go through alot of pain I ripped my router out and just said the heck with it

    10 redh brown 04.03.08 at 12:17 pm

    hi there?!
    i have a 36 console and i’m trying to connect it on xbox live, but when i try test the connection it keeps on saying that my MTU is failed? i dont know why my MTU keeps on failing because i’m using a modem not a router, can you help me with this?
    by the way my modem is scientific atlanta dpc 2100

    11 Ross McKillop 04.03.08 at 12:31 pm

    @redh brown:

    Sorry I honestly don’t even know what a 36 console is. Do you mean a 36″ console TV? Since you don’t have a router, I’m guessing you’re plugging the modem directly into your Xbox? Which leads to me these two questions:

    1. Has the modem ever worked while hooked up to a PC?
    2. Who is your ISP? Some of them will lock a modem to only work with a specific MAC address, and since your modem was (or may have been?) plugged into a PC, now you need to get the ISP to “allow” the Xbox’s MAC address.

    Hope this helps -

    Ross

    12 redh brown 04.04.08 at 6:23 am

    ok, so you mean when MTU is failed i need to call my ISP to allow the mac address of my xbox 360 console?
    my ISP is cox cable

    13 Angie 04.15.08 at 11:52 pm

    I have a Virgin Media cable connection and I’m having problems setting my Scientific Atlanta 2100 (the modem Virgin gave me) up with my wireless router - a Belkin G + MIMO. I can get 2 networked PCs online but i cannot get my laptop or other devices linked wirelessly. It used to work (although intermitantly) but since unplugging for another reason, the wireless aspect has not worked again since. Please help!

    14 coopsdeville 04.29.08 at 3:09 am

    what is the ip address to configure this modem?

    15 Zak 05.03.08 at 5:23 am

    Iam having a Scientific Atlanta 2100 cable modem supplied by Virgin Media. Can I connect one PC via Ehernet portal and another via USB portal at the same time.

    16 Ross McKillop 05.03.08 at 9:19 am

    @Zak:

    Sadly no, it’s one or the other. What you need is a router, so you can connect multiple devices to the same Internet connection. The good news is they’re fairly inexpensive now.

    17 brian 05.17.08 at 8:31 pm

    If you unplug all the cables the light will stop, its blinking either from the ethernet cord from your computer or from the coaxle cable. Either way you arn’t paying for that little light if thats what you cared about because the power is comming from one of the two cords.

    18 kyle 05.25.08 at 5:19 am

    Hey guys im having trouble trying to hook up my xbox live, this modem only has 1 Ehernet portal does the xbox ehernet cabel and the ehernet cabel for the computer have to be plugged it to

    19 aerlo25 05.25.08 at 12:59 pm

    algien que me pueda decir porque mi pc me dice que tengo conectividad limitada o ninguna. y cuando enciendo el utorrent se reinicia solo y no encuentro la solucion.

    20 ty597 05.28.08 at 4:52 am

    I have a 2100 modem from Cox, and my computer is getting internet off the USB cable but not from the Ethernet adapter. The Ethernet cord works on my friends computer but not mine. Can anyone help?

    21 tom 06.01.08 at 9:47 am

    I have got this modem through virgin media broadband.

    I have an orange/wanadoo livebox from my previous ISP that i wanted to use to give me “wireless”.

    Is it possible to connect the VM modem to the livebox to give me wireless? The livebox connects to the net through telephone line RJ11 connector.

    22 Charlie 06.11.08 at 2:10 am

    Some body help me? my scientific atlanta cable modem usb driver fails frequently.even tho i uninstall the driver and restart the machine the provided CD wont start auotomatically.each time i have to format the system to reinstall the driver.

    23 Lara 06.12.08 at 5:31 am

    Hola, tengo un problema con los puertos del emule y quizá aquí encuentre la solución… tengo la id baja y me han dicho que es cosa del modem ¿podeis ayudarme? gracias

    24 Michael 06.16.08 at 3:14 pm

    hi there,
    I would be happy if someone could answer this for me…. i have a atlanta modem and it works fine for my computer…but i wanted it for xbox live….when i try to hook it up….it says the mtu is to high….how do i lower the MTU…..its driving me crazy….
    Please help someone

    25 Michael 06.16.08 at 3:19 pm

    hey kyle

    i dont know about that problem….but i want my xbox 360 to have live to but….the mtu is to high can you help me….

    26 KYLE 06.16.08 at 5:53 pm

    Hey Michael would i did was bought a cheap wireless router and hooked it up to my computer if you get one it is really easy to do just follow the steps, if you want to use an ethrnet cabel just hook it up from your xbox to the router its really easy i bought a router for $30 came home and was playing Call Of Duty 4 in 15minutes belive me I dont know alot about computers so but a wirless router at future shop for $30 its your best bet when u get xbox live whats your gamer tag ill tell u mind later

    Hope this helps You

    27 Sajwar Saleem 06.23.08 at 8:48 am

    My modem used to be perfect i played live on xbox360 ad i got internet on my PC but know the cable single turns on and when i click on internet or mozilla firefox the sigle goes away and then i got no internet this has been going on for like a 3 weeks what should i do?? sum1 plz help me!!

    28 J.C. Coelho 06.24.08 at 3:35 am

    Hey there I recently got this modem from my cable isp and it got setup without a hitch.

    Problem is my Blizzard games can’t connect to the gaming server. I’ve been wondering for some time now whether I have to (or if it’s possible) setup port forwarding on this model so the games work? Maybe I need to flash it, is this possible at all?

    Or it might just be my isp’s fault, I’ve already contacted them locally here in Mozambique. Any clues most welcome.

    29 Aaron Malawey 06.25.08 at 4:39 pm

    I currently have this modem and I can tell you all mostly what you need to know. First this is a simple good design for this modem but the quality of completly crap. I do have to unplug it atleast 2 or 3 times a day in order to restart it to get a proper internet connection because it gets too hot too easily, especially if you are a gamer. If you don’t have the installation cd it is virtually impossible to locate the drivers for the usb connection so if you cannot use it through ethernet port then you may as well return it. The modem is obsolete so they do not manufacture this model anymore so they do not provide support for it and it sucks.

    30 Rhys 07.05.08 at 1:39 am

    Hey why does my send and recieve lights keep on dropping? It causes me to lose internet connection… Any ideas? Thanks

    31 Irineu 07.08.08 at 10:55 am

    Eu gostaria que alguém me passace o link para mim baixar o soft do driver cable modem DPC2100 !!!!

    32 Peke 07.26.08 at 11:52 am

    i have a Scientific Atlanta DPR2325 Cable Modem Gateway (the one that includes 4 ethernet ports and a wireless anthena)

    i have tried almost everything to hook me up in xbox live…

    has anybody solved issues of MTU test with this CABLE MODEM i changue it for a DPC100 model but still the same problem…

    Internet works fine in both modes (ethernet and wireless) in mi lap… but xbox live doesnt pass the mtu test.

    I have a 1.5mbps bandwith via cable.

    And can the problem be solved with the wireless adapter of the XOBX 360?

    I also tried the trick of the laptop as a wireless adapter but didnt work..

    if anybody know what can i try please let me know… this is my email.

    killpeke@gmail.com

    kisses from a desperate girl gammer.

    33 Erin 08.07.08 at 9:24 pm

    I recently got the dcp2100. I have a netgear wireless router and can not hook it up. I am hooked up to the computer thru the usb port but can not get it going with my ehternet hub. I don’t know what else to do help.

    34 shaun 08.09.08 at 11:41 pm

    figured it out.

    goto router setup (usually 192.168.0.1) and for MAC address choose use computer address. Cox is looking for my PC’s MAC address and purposely trying to block the router.

    35 Adam H 08.23.08 at 6:30 am

    Dear sir,

    kindly explain how to power up my Scientific Atlanta EPC2100R2, to speed up !, the bandwit

    thank you

    36 Brandon 08.25.08 at 6:31 pm

    We just got this modem today that was installed by a Roadrunner person, and even though it was just put in today, there is no connection. All the lights continue to flash once every second or so all at the same time. How do I fix this?

    37 FERNANDO M 09.09.08 at 4:46 pm

    HOLA TENGO UN PROBLEMA TENGO UN MODEM SCIENTIFIC ATLANTA 2100 LA CONEXIÓN DE UN CABLE DE BANDA ANCHA de servicios de Internet a través de cable USB Y QUIERO CONECTARLO A TRABES DEL CABLE ETHERNET COMO ERA ANTES DE TENER QUE RESETEAR LA MAQUINA POR X MOTIVO. ALGUIEN PODRIA DESIRME COMO LE AGO. GRACIAS!!!!!!!!!

    38 lian 09.10.08 at 7:49 am

    se me reinicia sola la pc a que puede deverse

    39 alejandro 09.17.08 at 2:34 pm

    Disculpen… quien me puede ayudar con esto: necesito cambian mi ip.. tengo un Scientific Atlanta 2100… eh tratado de cambiarla con programas pero no m funciona… se de la opcion de cambiarla manualmente, pero no se si es q tengo q poner cualquier numero… o uno en especifico…

    espero q m puedan ayudar! Gracias…

    40 nitin asati 09.22.08 at 10:31 pm

    Hi,

    I am trying to setup a wireless router network. my service provider supplied a cable modem which i am trying to configure with linksys wireless router. when i run the linsys router setup CD it is not identifying my DSL cable.

    probably this is with the kind of cable I am using. someone has suggested cross cable. is that a workable solution?

    41 Kevin 10.02.08 at 4:20 pm

    Hi, i have this modem, and im just wondering if i can unplug the ethernet cord from my airport (which is connected to my modem by ethernet), and plug it directly into my computer so my internet is faster? it is simple but i just want to know if this will make any problems. is it completely safe?

    42 Florián 10.04.08 at 3:00 am

    Tengo un modem Scientific Atlanta EPC2100 y quiero desconectar el cable del modem pero la tuerca no gira y si lo fuerzo gira un poco la pieza en la que se rosca y tengo miedo de romperlo. ¿Podría alguien dame una orientación de como sacar el cable? Gracias.

    43 WJC 10.14.08 at 4:24 am

    Olá a todos,

    Tenho um MODEM DPC2100, ha muito tempo eu tive o servico da NET Virtua e cancelei pois mudei de regiao, sera que ele foi bloqueado? Alguem sabe se e possivel desbloquear o acesso a internet pela NET Virtua?

    Abraços a Todos

    44 tanner 10.20.08 at 6:17 pm

    i need help if i wanna connect with the usb cord “using ethernet for 360″ can i download the usb “driver ” or what ever was on the cd?

    45 Amir 10.25.08 at 10:15 am

    Hello,

    I have a Scientific Atlanta DPC2100 modem. I just recently got cable internet thru brighthouse, and was provided with a modem just like the one that i have and it is working. but, when I want to hook mine up in a different room all of the lights on the modem flash together about every second. how can I fix this so that I can use this modem?

    46 Karel 10.27.08 at 1:57 am

    I have Scientific-Atlanta WebSTAR Cable Modem and
    it works fine while connected via an ethernet cable.
    It works also via the usb connection. The problem starts after sleep/wakeup of the laptop. Sometimes after wakeup the connection is there, sometimes not. Restarting the PC solves the problem, but restarting vista takes ages. It is a big bore. Does somebody have a solution?

    47 Westerling 11.19.08 at 4:32 pm

    I have this modem and it is a piece of shit… I have it setup with a belkin wireless router and I have to unplug everything from it inclusing the coax and ethernet cables 10 times a day and wait for 2 minutes to get it working again when it drops the connection. There seems to be a resynchronization problem whenever the modem experiences a little disturbance. It works fine on USB but with a router it completely blows.

    48 Tolik 11.27.08 at 12:06 pm

    Здравствуйте. Как долезть на ЕРС2100R2 до сервисного или инженерного меню, есть ли в нем возможность изменить IP DHCP

    49 J.C. Coelho 11.28.08 at 8:05 am

    Actually this turned out to be a terrific little performer.
    It was my ISP’s fault that games didn’t work since they were disabling a lot of protocols, and it’s really delivering now.

    I’m joining the club that Cable is best for gaming and am fully impressed with this product. Only a power switch would be an improvement imho ;)

    50 Herberth 12.27.08 at 4:02 am

    Gostaria de saber com posso configurar (rotear) meu scientific Atlanta 2100. Minha internet é de 1M, e possuo um switch des-1008D para receber o modem.

    51 ricardo 12.27.08 at 3:29 pm

    ola tengo un wireles usb adaptater que es netgear WG111v2 y lo quiero instalar pero no puedo por que no tengo el disco de instalacion que puedo acer para instalarlo sin el disco eske cuando lo conectome pone que tengo que instalar el software controlador y que introduzca el disco pero yo no tengo el disco que puedo acer para instalarlo sin el disco

    gracias de ante mano y salu2

    52 ricardo 12.27.08 at 3:30 pm

    si alguien lo sabe que me responda por fa y gracias

    53 Ross Gilchrist 12.29.08 at 8:00 am

    Hey, I was wondeig how to open ports with this on the settings, because I have a few that need opened to I can connect to my Xbox Live. I keep failing because of a DNS or something.

    I called up Xbox and they said I needed to open these ports -

    This is what they told me

    1. Iop3074
    2. 3330
    3. 53
    4. 88
    5. T.c.P 3074

    Help? lol

    54 caconquenco 01.04.09 at 7:37 pm

    amigoos … tengo un atlanta 2100 , el problema que tengo es el siguiente,
    no puedo configurar el mismo para que poniendolo contra un router wi fi
    pueda tener conexion inalambrica… gracias…

    55 lee 01.27.09 at 3:55 pm

    hi, im having trouble changing my mtu, i need to change it as i keep having trouble accessing windows live messenger and windows updates. there are 2 er
    rror codes i keep getting

    error code: 80048820
    extended error code: 80048439

    changing the mtu seems the only option, its not my time and date as some people quote after googling the error codes… please could you give me step by step instructions on how to change the mtu… many thanks lee…

    56 matias 02.04.09 at 9:46 am

    alguien me puede explicar como puedo conectar 2 pc con este modem? en realidad , como puedo configurar las 2 pc para que ambas tengan internet.
    Una de ellas no tiene placa de red, y la conecto por puerto USB. La otra si tiene.
    Es posible conectar 1 pc por puerto USB y la otra por cable ethernet, o placa de red?
    Siempre anda solo una maquina.
    He cambiado la direccion ip y me figuran las 2 conectadas, pero 1 no se conecta en realidad.. me explico?
    perdonen mi ignorancia.. jeje
    alguien que me pueda responder!
    saludos

    57 lanie 04.05.09 at 10:34 am

    hi i need help finding the network password for this router so i can set up the internet on my ipod touch.
    any solutions???????????

    58 Viral Panchal 04.21.09 at 11:57 pm

    i need 64-bit driver for scientific atlanta USB Cable modem DPC2100.
    Plz help me…..and reply me on my email id: viral_panchal31@yahoo.com

    59 Kari 04.24.09 at 7:39 am

    I have the 2100 router through comcast cable and it i s soooooo slow almost like dial up. I am connected with the ethernet cord, should i plug in the usb, will it help or is it the modem? The send and recieve lights are hardly ever on, what does that mean? I really would appreciate it if someone could help me figure out why my connection is so slow. I thought cable was supposed to be faster? Any thoughts????????

    60 Andre Lavictoire 05.02.09 at 1:55 am

    I have a problem using My Bloody Linksys WRT54G2 Wireless Router and Cable Modem with Rogers Cable.

    Here is my setup ….

    3 Computers wired in the router.( 2 computer = Windows XP and the other computer Windows Vista Home Premium )

    Rogers Cable Modem - Scientific Atlanta DPC2100R2 Cable Modem
    Computer #1 - Wired Connected - Windows XP Home - Service Pack 3
    Computer #2 - Wired Connected - Windows XP Home - Service Pack 3
    Computer #3 - Wired Connected - Windows Vista Home - Service Pack 1
    PS3 Wireless
    Nintendo Wii Wireless

    1. All my computers are able to connect to the internet. ( SOMETIMES )
    Most of the times it keeps dropping my wireless signal.
    Not dropping the signal to the other computers but dropping signal to the Rogers Modem

    Please I need Help…

    61 Gustavo 05.04.09 at 9:35 pm

    I have this dpc 2100 cable modem but i need to connect it to my pc by usb but the problem is i got win xp 64 and i cant find any driver for it on oficial webpage doenst seems to be some kind of driver for win 64 plz let me know if theres any option or any driver avaiblable. thanx

    62 Chris 05.09.09 at 7:31 pm

    Same here. I also have the DPC2100 cable modem and have recently swiched computers to Vista x64 bits. If anyone knows of a driver for this or how to contact Scientific Atlantic, Cisco or whoever is making this, please let me know. Email me at short223@hotmail.com
    Thanks

    63 ryan 05.10.09 at 8:11 am

    I got this modem from my ISP, and I’m having problems maintaining a connection. I have been told by the cable company that the reason I disconnect so much is because I have to run my cable off a 3-way splitter (one to the modem, the other two go to tvs), however, I’ve noticed that the internet cuts out ever 2-3 minutes for about one minute, over the course of several hours, mostly during the early afternoon and late morning. If the splitter were the cause, wouldn’t I cut out ALL the time?

    Note: Using my browser, it doesn’t cut out so much. When I play games online (World of Warcraft, Total War, etc..) its very regular.

    Please, any information would be greatly appreciated.

    64 Jimmy 05.18.09 at 2:04 pm

    Cable Modem Admin Page:

    192.168.100.1

    65 Jimmy 05.18.09 at 2:09 pm

    Correction:

    http://192.160.100.1/_aslvl.asp

    Pull down menu to Access level 2

    Password: W2402

    Press “return to main page”

    woot

    66 Website 05.24.09 at 8:30 am
    67 Miguel Alban 06.07.09 at 2:20 pm

    Tengo un problema con un módem Marca Scientific Atlanta EMTA MAC, no encuentro los Controladores Para este equipo que fué comprado por medio de la empresa TELMEX qienes prestan el servicio de internet de Banda ancha por medio de este Módem… pero los “señores de TELMEX” no cooperan, por no tener un servicio al cliente (adecuado).
    si hay alguien que me pueda ayudar en este sentido se lo agradeceré demasiado.
    De antemano muchas gracias.

    68 steven 06.11.09 at 6:35 pm

    i want to connect to xbox live and i keep having problems can someone help

    69 Bruna Araujo dwe Castro 06.14.09 at 2:46 pm

    Gostaria de compartilhar meu moden scientific atlanta com outros micros . ´e só comprar um swchith e pronto? alguem poderia me ajudar dizendo como configura-lo por favor?

    70 diego 06.27.09 at 12:21 am

    alguien tiene el disco de instalacion de este modem lo necesito con urgencias xq no puedo encontrar los drivers
    se los agradeceria si me lo mandaran ami correo …

    gracias .

    71 Stan 06.29.09 at 5:54 am

    Hi, I noticed the comment from a few others about local IP address of the Cisco/Scientific Atlanta Cable Modem Modl RPC 2100. This local IP is useful to access the “admin page” of a modem from a PC on the same internal network.
    Soemone (Jimmy) said that the local IP was 192.168.100.1 (the same as the Motorla cable modem.
    However that address (http://192.168.100.1) dpes not bring up any web-page interface. I can PING that address 192.168.100.1 from the router which I have connected to the cable modem.
    Jimmy correctled that web-page address , to be:-
    http://192.160.100.1/_aslvl.asp
    But thgis does not work either, and ai cannot PING 192.160.100.1 from it attached router.
    Any ideas how to access the admin web-page of this cable modem?
    Thanks,
    Stan

    72 Fabricio 06.29.09 at 3:11 pm

    Consegui acessar as informações atraves do http://192.168.100.1/_aslvl.asp, como dito acima, mas só dá pra acessar informações. Gostaria de uma maneira pra mexer nas configurações, pra tentar ver como configuraram a velocidade da internet, pois acho q está bem abaixo da velocidade contratada.

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