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WIRELESS PROTOCOLS

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Our client

US Wireless Network Product Developer


The challenge...................................................»

The Client design and Manufactures broadband networking products based on the DSL communications including a ‘DSL Home gateway’. The client wanted to add 802.11b based Wireless LAN capabilities to its DSL Modem, so that the Internet service providers can use this DSL gateway to provide the last mile Internet services wirelessly to their clients. The new product needed to be a bridge with 802.11b based Access Point as one of its port and the other port that would provide the distribution services using 802.3 Ethernet over DSL.

The solution......................................................»

DCM has a homegrown IP for MAC Layer of IEEE 802.11a/b/g based Wireless LAN. This IP has been ported to Altera Excalibur board having an ARM 9 Micro-controller and a PLD/FPGA device. The MAC upper layers performing the protocol management and buffer management functions runs as firmware on the ARM 9; and the MAC Lower layers performing the PHY control, time critical functions and certain computation intensive functions run in the FPGA. This port was used and customized according to the client’s requirements of the DSL gateway. Since the gateway has a lot of variable sized traffic going between a specific 802.11 station and the Access Point port on the gateway a ‘Packet Forwarding Expressway’ was constructed to reduce the per packet overhead of forwarding. The client was able to utilize the customizable features of the DCM 802.11 IP, by moving the Encryption algorithms from Hardware to software, re configure the hooks for the exponential back off routines. Thus DCM helped the client realize the wireless support in the DSL Gateway, reducing the product development costs and schedule.

The following diagram shows the 802.11 MAC Architecture broken into host software, Ethernet support for AP, MAC upper and lower layers.

 








Our client

US based Wi-Fi Equipment Developer


The challenge...................................................»

The Client manufactures 802.11a/b/g based access points. These Access Points act as last mile provider for the Internet service providers. The challenge was to provide remote Device and Network Management. Three mechanisms for Device & Network Management were required:

  • Command Line interface (CLI) over serial port
  • Web based Configuration utility
  • SNMP Agent

The solution......................................................»

DCM has a homegrown IP for MAC Layer of IEEE 802.11a/b/g based Wireless LAN. This IP has been ported to Altera Excalibur board having an ARM 9 Micro-controller and a PLD/FPGA device. DCM had used and customized this IP to build Access Point solution for the Client. This IP has a built in Device Management Application that is used to configure the Access Point Device through the DCM’s defined Functional MAC API (FMAPI) and the APME API (APAPI). This Device Management Application was suitable only for standalone configuration using the CLI and was not sufficient for the needs of the client.

To provide these services DCM built a complete Configuration Management Application comprising of an SNMP Agent, a Web based Configuration Utility and CLI application over the serial port.

The SNMP Agent supported MIBs for:

  • 802.11 a/b/g specification
  • 802.1d, 802.1x based bridging application
  • 802.2 based LLC Application
  • TCP / IP
  • 802.11f based IAPP & Roaming

The Web based configuration utility had 30 screens including screens for:

  • Device Configuration
  • Filtering rules
  • Device Statistics
  • Authenticator Configuration
  • Associations
  • Web server Configuration
  • AP Radio configuration
  • TCP IP setup

 
 
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