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6 扩展通信用频带的CATV装置 CATV网络中留做上行信号频带为12MHz到48MHz,但如前所述其中30MHz以下因汇合噪声的影响大导致使用困难。另外,对地方频道来说,CATV传输通道通常被用于运动会及节日的转播,因此一般要进行现场图像中继。考虑到这些,能供通信用的频道就只剩下两个了。若用这两个频道进行有线因特网及电话业务,则实际上就没有了备用频道。今后即使增加双向业务及应用,也再没有可载用的频道了。
6 CATV devices for expanding communication bands CATV networks have uplink signal bands reserved for 12 MHz to 48 MHz. However, as mentioned above, the use of CATV networks under the influence of confluent noise causes difficulties in use. In addition, for local channels, the CATV transmission channel is usually used for sports games and festival broadcasts, and therefore, an on-site image relay is generally required. With this in mind, there are only two channels left for communication. If these two channels for cable Internet and telephone services, there is virtually no spare channel. In the future, even if we increase the two-way business and applications, there will be no more channels available.