We have 3 Mac computers in the house, and all are having a problem with slow response time, often simply responding with a "cannot find the website" message. We have had all three computers cleaned & checked the line into the house. Have been told that possibly modem is too old. It is a SpeedStream 5360 ADSL. How do we know if we need a newer modem? Or if it is not the modem at all?

SOURCE: Speedstream 5360 modem

1. From the System area, , select Network Settings.
2. Select Edit Settings.
3. Select Additional Settings, and then select PPPoE Settings.

• Password
• Service Name

1. Select Done. When prompted, select Test Xbox Live Connection.

SOURCE: INSTALL A MODEM

The 5360 is techncially a bridge, not a modem, so it doesn't require software drivers for installation and operation.
There is a 5360 firmware upgrade, but it should only be used in certain situations -- see Related Articles at right for further information.

Note that DSL and cable bridges are often called "modems" because that is the familiar term for a device that connects the residential user to the ISP.

Please refer the link below:

http://kb.efficient.com/display/1/articleDirect/index.asp?aid=45459&r=0.9242823

Also refer the FAQ for 5360:

http://www.broadbandreports.com/faq/eff/6_5360

Thanks

SOURCE: speedstream 5360

try 192.168.254.254

SOURCE: Power requirements for an Efficient

You need a power supply which converts AC to 12Volt DC power.
While purchasing Please keep in Mind that the ADSL power IN socket should be matching with the new Power adapter.