| 摘要 |
<p>An advanced telecommunication system is provided for central control of electronic signs (32). A display development kit is provided to create binary display programs which create visual activity on one or more electronic signs. These display programs are stored on the disk drive (18) of a system control computer (16) which periodically runs a system control program to upload display programs to the electronic signs using radiopaging signals. The system control program employs a telephone modem (20) to connect through a public switched telephone network (PSTN) (26) to a paging terminal (22). In accordance with the system control program, the system control computer divides each display program into multiple packets which are transmitted to the paging terminal as alphanumeric radiopages. The paging terminal encodes the packets into radiopaging format, frequency shift key modulates the data, and transmits the pages on a radio frequency channel. Electronic signs (32) decode the radiopages into data packets. A receiver subsystem (34) in the electronic sign reconstructs the original display programs using the data packets. Data provided in a display program can span across more than one page. The system control program creates packets containing display program data such that blocks of display program data that are greater than one page are transmitted transparently to a paging terminal from the central computer, and from the paging terminal to a paging receiver without requiring hardward or software modification of existing paging terminals and paging central offices.</p> |
