Communication device for obtaining an application image or configuration from a service provider
View Patent ↗A DSL customer premises equipment modem (DCPE) avoids the requirement of a flash or other static memory for storing an application image or configuration on the modem. The modem instead stores microcode used to boot its chipset and obtain the application image and/or configuration from a remote site, such as the central office (CO). In one possible startup procedure, this microcode initializes the modem's chipset, starts the DSL driver, establishes a data link with the service provider's CO equipment, and downloads the application image and/or the configuration from the CO. Other types of communications devices, such as cellular phones or other portable devices, can perform a similar procedure to obtain an application image from remote source, such as a base station.
1. A customer premises DSL modem comprising:
a DSL modem chipset;
a RAM; and
a memory unit storing microcode for execution by the chipset, the microcode comprising:
a protocol application for communicating with a central office to obtain an application image for the modem, the protocol application allowing communication with the central office without using an application image, and
a boot loader for causing the chipset to establish a data link with a central office using the protocol application.
2. The modem of claim 1 , wherein the protocol application stored in the memory is compressed, the microcode further comprising:
a decompressor that includes code for decompressing the protocol application into the RAM.
3. The modem of claim 2 , wherein the decompressor further includes code for checking the integrity of the decompressed protocol application.
4. The modem of claim 1 , wherein the boot loader further includes code for initializing the RAM and for performing a memory test.
5. The modem of claim 1 , wherein the protocol application comprises a BOOTP/TFTP application for communicating with the central office using BOOTP and TFTP protocols.
6. The modem of claim 1 , wherein the protocol application further communicates with the central office to obtain a configuration for the modem.
7. The modem of claim 1 , wherein the protocol application obtains the application image by:
sending a unique serial number to the central office;
receiving a MAC address from the central office; and
negotiating with the central office to obtain one or more parameters for the data link.
8. The modem of claim 1 , wherein the memory unit is external to the chipset.
9. The modem of claim 1 , wherein the memory unit is fused into the chipset.
10. The modem of claim 1 , wherein the memory unit comprises a one-time programmable ROM.
11. The modem of claim 1 , wherein the microcode is 128 kb or less.
12. The modem of claim 1 , wherein the modem does not include an onboard flash memory.
13. A customer premises DSL modem comprising:
a DSL modem chipset;
a memory unit comprising a persistent memory that contains microcode for execution by the chipset to cause the chipset to perform the operations:
establishing a data link with a central office without using an application image,
downloading an application image from the central office via the established data link, and
loading the application image into the modem.
14. The modem of claim 13 , wherein establishing the data link comprises:
sending a unique serial number to the central office;
receiving a MAC address from the central office; and
negotiating with the central office to obtain one or more parameters for the data link.
15. The modem of claim 13 , wherein the persistent memory further contains microcode for execution by the chipset to cause the chipset to perform the operations:
downloading a configuration from the central office via the established data link; and
loading the configuration into the modem.
16. The modem of claim 13 , wherein the application image is downloaded using BOOTP and TFTP protocols.
17. The modem of claim 13 , wherein the memory unit is fused into the chipset.
18. The modem of claim 13 , wherein the memory unit comprises a one-time programmable ROM.
19. A method for obtaining an application image for a customer premises DSL modem, the method comprising:
establishing a data link with a central office without using an application image;
downloading an application image from the central office via the established data link; and
loading the application image into the DSL modem.
20. The method of claim 19 , wherein establishing the data link comprises:
sending a unique serial number to the central office;
receiving a MAC address from the central office; and
negotiating with the central office to obtain one or more parameters for the data link.
21. The method of claim 19 , further comprising:
downloading a configuration from the central office via the established data link; and
loading the configuration into the modem.
22. The method of claim 19 , wherein the application image is downloaded using BOOTP and TFTP protocols.
23. An electronic communication device comprising:
a chipset; and
a memory unit storing code for execution by the chipset, the code comprising:
a protocol application for communicating with a service provider to obtain an application image for the device, the protocol application allowing communication with the service provider without using an application image, and
a boot loader for causing the chipset to establish a communications link with the service provider using the protocol application,
wherein the electronic communication device comprises a cellular phone.