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专用网络系统供应商经常遇到看似矛盾的目标而面临选择:一方面要保持较低的网络成本;而另一方面,又要保证构建的网络系统能满足未来的应用发展的要求。今天,在为这一目标寻求答案的时候,供应商会经常在非屏蔽双绞线(UTP)和多模光纤系统之间徘徊。对这一问题,目前并没有一个明确的答案。大多数以语音和数据混和应用的网络系统,为达到最佳性能价格比,需要采用一种铜缆和光纤的混合系统。对于传统语音和传真服务,非屏蔽系统(UTP)毫无疑问是最佳选择;但对于数据应用情况就变得十分复杂。对LAN系统,高性能5类UTP在达到最低初装成本的同时,可提供高达155Mbps的网络传输速度,然而,光纤布线系统可以降低重辅布线的费用以及日后的
Private network system providers are often faced with seemingly contradictory goals and choices: on the one hand to maintain a low network cost; the other hand, but also to ensure that the construction of the network system to meet future application requirements. Today, in seeking the answer to this goal, vendors often wander between Unshielded Twisted Pair (UTP) and multimode fiber systems. There is currently no clear answer to this question. Most network systems that use mixed voice and data applications require a hybrid system of copper and fiber to achieve the best price / performance ratio. Unshielded (UTP) is undoubtedly the best choice for traditional voice and fax services; however, it becomes more complicated for data applications. For LAN systems, high-performance Category 5 UTPs deliver up to 155 Mbps of network throughput while achieving the lowest initial installation costs. However, fiber-optic cabling systems can reduce the cost of heavy-cabling and future