| 摘要 |
<p>In a communications system comprising multiplexer apparatus for transferring data over any one of a plurality of communications lines, line scanning apparatus is provided to address and enable the transfer of data over any one of the communications lines, which lines are divided into groups characterized by the lines maximum frequency. The apparatus of the invention includes a main address counter which is used primarily to address low speed communication lines and thereby enable the transfer of data thereover, a sub scan counter which is utilized primarily to enable the transfer of data over high speed lines, and a medium speed counter which is utilized in combination with the other counters to address the medium speed lines under certain conditions.</p> |
