View Full Version : two cable modems, different locations
I have cable modem service at home and at the office it is available. Is there a way to clone my home modem with the second modem i will put at the office so that I don't have to pay for 2 service connections a month. Occasionally I take the home modem to work when I need a high speed connection and it works just fine.
Motorola sb4100 surfboard modem is in use by cable vision, nj.
Also, any way to change or tweak the internal settings of these units and if so how?
noway to change anything internal, and i dont beleive that you can clone a modem like that.sounds kinda strange that you can take your home modem to work and it would work there, unless it is in the same node.;)
10-15-01, 09:08 AM
You could purchase a second modem, and pay an extra $20 per month to use it simultaneously with your Optimum Online account. Optimum Online might not like it that you're doing that since their TOS says that extra cable modems can only be used in the same service location. Technically, it will work.
10-15-01, 09:12 AM
Well, it will only work if the office and home are served by the same port on the same CMTS.
Mosdef knows that, his mouse musta got in the way of his eye teeth and he didn't see it.
10-15-01, 09:17 AM
LOL.. Yeah.. You're right.. Too early in the morning for me, not enough caffeine in me. :D
10-15-01, 01:45 PM
But, wait a sec mosdef,.....wouldn't the modem serial number have to be atached to his work location aswell in order to get a signal to the modem. The sb4100 is a docsis modem and as far as I know, which isn't much, unless that particular s/n is at that exact location....the modem will get no signal. Thus preventing any connection to the modem. All he'd get is a blinking "cable" or "online" light.
10-15-01, 02:05 PM
Okay.. Cable modems sort of work like cable TV addressable converters, except that they have a limitation that doesn't allow them to be as flexible as cable converters.
Pre-programed Cable TV converters have a set channel line-up assigned by the cable operator, and this can vary by every franchising hub they service. If you take your cable TV converter down the block from your house, or perhaps across town, chances are your cable TV converter will still work, and will still return the same channels, provided that the line up pre-programed on your converter is available where you're hooking it up to. Cable modems sort of work the same way.
Cable modems "talk" to a headend. The headend tells a cable modem certain information it needs to operate, such as the speed caps, the frequency at which it can trasmit and receive (or the channel it can tune into), and once that communication has been established, it then proceeds to get it's layer 3 information like your IP, and DNS server addresses. The headend also stores important information about your cable modem such as your cable modem's MAC address. Unlike DSL, which only a single loop will only work with your DSL service, cable modem service will work with any drop, or any coaxial cable you can find hooked up to a pole that is in working order. This flexibility does have a catch to it, cable operators may assign nodes in different remote locations where needed. Nodes typically service about 500 users at normal capacity without needing a split. That kind of coverage could be considered extensive, and chances are it spans across a certain area, like maybe a good handful of blocks, or even a neighborhood. Because the nodes at the headend only do allow your cable modem to transmit data once it verifies its MAC address and it does the handshaking that needs to take place, your cable modem will not work in areas serviced by a different node than the one that originally registered your cable modem's MAC address. Hence, if you try to use your cable modem from home at work, and your work place is serviced by a different node than the one that services your home, your cable modem will not pass MAC address verification, and it will not transmit.
With a cable TV converter is different. You could take your converter to your work place, or anywhere else where your cable operator has a franchised hub in place, and it will still work for as long as where you're connecting the converter has two-way addressable service.
I know I probably explained more than you wanted to know, but I hope this makes sense.
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