[解析] CISC(Complex Instruction Set Computer)复杂指令计算机,是台式计算机系统的基本处理部件,每个微处理器的核心是运行指令的电路。指令由完成任务的多个步骤所组成,把数值传送进寄存器或进行相加运算。CISC也可以指采用一整套计算机指令进行操作的计算机。 RISC的英文全称是Reduced Instruction Set Computer,中文是精简指令集计算机。特点是所有指令的格式都是一致的,所有指令的指令周期也是相同的,并且采用流水线技术。这种设计思路对指令数目和寻址方式都做了精简,使其实现更容易,指令并行执行程度更好,编译器的效率更高。
Using fiber optic cable,optical communications have enabled telecommunication ______ to be made over much greater distances and ______ much lower levels of ______ in the transmission medium and possibly most important of all,optical fiber communications have enabled much higher data rates to be accommodated.
As a result of these advantages,optical fiber communication systems are widely employed for applications ______ major telecommunications backbone ______ to Ethernet systems,broadband distribution,and general data networking.