同轴接入设备的系统升级机制设计

高性能同轴网络(HINOC,High performance Network Over Coax)是面向下一代广播电视网的同轴电缆接入新技术,是实现模拟电视系统双向数字改造以及广播电视三网融合战略的关键技术之一.HINOC系统中的嵌入式设备HB(HINOC Bridge)与HM(HINOC Modem)需要通过在线升级实现软件版本的不断更新.针对目前一般的软件在线升级系统中普遍存在的整体加密传输效率低、硬件失效缺乏保护等问题,本升级系统设计在文件的传输和文件烧写的基本步骤上引入了文件差分编码解码、文件校验与加密解密以及异常保护机制.实际测试结果显示,升级系统能够满足HINOC系统在效率、安全性和可靠性方面的要求,保证了嵌入式系统的信息安全以及嵌入式设备在异常情况下的稳定工作.

Design of firmware upgrade algorithm for HINOC system

High performance network over coax (HINOC) is a new technology of coaxial cable access, used for next generation broadcasting network. It can be used in triple play and the two-way cable TV network of digital and upgrade. The system is made up of HINOC bridge (HB) and HINOC modem (HM). In order to improve software function, it is necessary to update embedded software. File transmission and FLASH ROM program are basic processes in upgrades. In consideration of problems existed in widely used upgrades system such as low efficiency of encryption transmission and the lack protection for hardware failures, the system design introduced mechanisms such as coding and decoding of delta information, cryptography, file verification, and abnormal protection. According to the experimental results, the design meets requirements of HINOC in terms of efficiency, security and reliability. Information safety can be effectively protected, and the embedded devices can maintain basic function when abnormal problems happen.