| 摘要 |
A system for communicating signals over a satellite (1) makes more efficient use of bandwidth compared with conventional systems. In one embodiment, the system converts an optical signal (10) having a first bit-rate format into a plurality of signals (11), each having a bit-rate format smaller than the first bit-rate format and thus smaller transmission bandwidths than the initial optical signal. The converted signals are then modulated and transmitted to a satellite (1) over a predetermined frequency band. The satellite (1) includes a first transponder having an operating bandwidth substantially equal to the transmission bandwidth of at least two of the transmitted signals, and a second transponder having an operating bandwidth sufficient to receive remaining ones of the transmitted signals. In one preferred embodiment, the higher bit rate format signal is an OC-3 signal (10), the lower-bit rate format signals are OC/STS-1 signals (11), and the first and second satellite transponders have 36 MHz operating bandwidths. Given these parameters, the system communicates information using less bandwidth than is required by conventional systems. |
