METHOD AND DEVICE FOR FREQUENCY SCANNING

1 . A device set in a multimedia cable network comprising:

a first modem having a first frequency comprising a first module configured to receive a beacon having a second frequency, when the first frequency of the first modem is not available, the first modem checks whether the second frequency is available in the multimedia cable network.

2 . The device as claim 1 , further comprising a second modem, wherein the second modem comprises a second module to receive the beacon, when the second modem joins the multimedia cable network, the second module receives the beacon.

3 . The device as claim 2 , wherein the second module receives the beacon from the first module of the first modem.

4 . The device as claim 1 , further comprising a management unit coupled to the first modem, wherein the management unit is configured to control the first modem.

5 . The device as claim 4 , wherein the management unit is configured to set parameters of the multimedia cable network.

6 . The device as claim 5 , wherein the parameters of the multimedia cable network comprise a downlink frequency.

7 . The device as claim 4 , wherein the management unit comprise a third module to output the beacon.

8 . The device as claim 4 , further comprising a filter coupled between the management unit and the first modem.

9 . The device as claim 1 , wherein when the second frequency is not available, the first modem starts to scan a frequency of the multimedia cable network.

10 . A method for frequency scanning, comprising:

determining whether a first frequency is available;

receiving a beacon comprising a second frequency when the first frequency is not available;

determining whether the second frequency is available; and

scanning to get a using frequency when the second frequency is not available.

11 . The method as claim 10 , further comprising determining the using frequency is available.