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    • 6. 发明授权
    • Fiber optic telecommunication system employing continuous downlink,
burst uplink transmission format with preset uplink guard band
    • 采用连续下行链路的光纤电信系统,具有预设上行卫星频带的突发上行传输格式
    • US5457560A
    • 1995-10-10
    • US243193
    • 1994-05-16
    • Randall B. SharpeJ. Richard JonesThomas E. O'SheaPaul W. CasperJames W. ToyGregory M. EvansRichard N. Sears
    • Randall B. SharpeJ. Richard JonesThomas E. O'SheaPaul W. CasperJames W. ToyGregory M. EvansRichard N. Sears
    • H04B10/272H04J3/06H04J3/16H04J14/08H04N7/173H04N7/22H04B10/00
    • H04J3/1694H04J14/08H04J3/0682H04N7/173H04N7/22
    • A fiber optic telecommunication system has master site linked to a plurality of subscriber interface sites by a single pair of optical fibers. Downlink messages are transmitted in a continuous TDM format over a first optical fiber from the master site to subscriber interface sites, and in a burst mode TDMA format over a second optical fiber from the subscriber interface sites to the master site. Each subscriber interface site is coupled to the optical fiber link by way of a multiple fan-out fiber coupling pedestal at a common location on the fiber pair. To prevent collisions between successive uplink bursts from the subscriber interface sites, a guard band separates successive uplink messages from one another. The guard band duration accommodates optical fiber transmission distance between the common location on the uplink optical fiber and the subscriber interface site whose differential optical fiber transmission distance from the common location is greatest. A subscriber location has a television decoder associated with the subscriber's television set, through which television channel selection signals are input by the subscriber for transmission from the subscriber interface site to the master site. Power is provided by way of a replaceable battery pack, housed in a subterrestrial bell jar configuration, effectively insulating the battery pack from extreme temperature changes and the intrusion of moisture.
    • 光纤电信系统具有通过一对光纤链接到多个用户接口站点的主站点。 下行链路消息以连续的TDM格式通过第一光纤从主站点到用户接口站点以第二光纤从用户接口站点到主站点以突发模式TDMA格式发送。 每个用户接口站点通过在光纤对上的公共位置处的多扇出光纤耦合基座耦合到光纤链路。 为了防止来自订户接口站点的连续上行链路突发之间的冲突,保护带将相继的上行链路消息彼此分离。 保护频段持续时间适应上行光纤上的公共位置与与公共位置的差分光纤传输距离最大的用户接口位置之间的光纤传输距离。 用户位置具有与用户电视机相关联的电视解码器,通过该电视解码器,用户输入电视频道选择信号以从用户接口站点传送到主站点。 电源通过可更换的电池组提供,容纳在地下钟罩配置中,有效地使电池组绝缘不受极端温度变化和潮湿侵入。