| 摘要 |
A line concentration system containing: a plurality of data input/output circuits (170, 171, 172, ... 17p, 190, 191, 192, ... 19p); a plurality of first-side transmission lines (490, 491, 492, ... 49m, 390, 391, 392, ... 39m) to each of which one of a plurality of data input/output circuits (170, 171, 172, ... 17p, 190, 191, 192, ... 19p) can be connected; a second-side transmission line (69, 59), and a data input/output timing controller (16, 18). The second-side transmission line (69, 59) is connected with the above plurality of first-side transmission lines (490, 491, 492, ... 49m, 390, 391, 392, ... 39m), and is capable of transmitting a predetermined number of channels of data. Each of the above data input/output circuits (170, 171, 172, ... 17p, 190, 191, 192, ... 19p) inputs/outputs data at a controlled timing from/onto the first-side transmission line to which its own data input/output circuits is connected. The data input/output timing controller (16, 18) controls the timings of the above inputs/outputs by the above plurality of data input/output circuits (170, 171, 172, ... 17p, 190, 191, 192, ... 19p) so that data input/output operations in two of the data input/output circuits (170, 171, 172, ... 17p, 190, 191, 192, ... 19p) are not simultaneously carried out. In addition, the line concentration system further contains a connection switching circuits, which is provided for connecting a controlled number of corresponding first-side transmission lines with the second-side transmission line (69, 59); and the controlled number can be selected among a plurality of predetermined numbers. |
