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Modem Power

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3 replies to this topic

#1 Turaiel


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Posted 22 August 2009 - 04:29 PM

I have a Speedstream 5360 ADSL modem from my DSL service a while back, and I seem to have lost the AC adapter. The modem calls for 18VAC 0.8A, but all I found was a 12V AC adapter, which may or may not be the one that came with it.

Herein lies the problem: when I plug it in and turn it on, the power light on the modem comes on, but none of the other lights do, and there seems to be no ethernet data transfer, because the light on the router doesn't come on either.

Is this because there's not enough power, or is this probably something normal?

Edit: The adapter is 12VDC 200mA

Edited by Riker, 22 August 2009 - 04:48 PM.

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#2 garmanma


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Posted 22 August 2009 - 06:23 PM

You need to match the voltage requirements exactly

Edited by garmanma, 22 August 2009 - 06:24 PM.

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#3 Platypus


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Posted 22 August 2009 - 11:16 PM

The adapter is 12VDC 200mA

No, you won't get anywhere with that supply. Not only is the voltage lower than required, it can't supply anywhere near enough current.

The adapter needs to be rated to provide at least 800mA. Some people have reported being able to operate the modem successfully on 12VAC. That can depend on the tolerance of the particular adaptor, and is more likely to succeed if the 12V adaptor has a higher current rating, eg 1.2A

This is the appropriate (US) rating adaptor:


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#4 Turaiel

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Posted 23 August 2009 - 02:14 PM

Thanks for the help. At the price for the adapter, we're probably better off getting a new modem from AT&T.

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