| 摘要 |
PROBLEM TO BE SOLVED: To read/write a signal on a back wire board at low speed by sequentially reading the signals from respective interface boards on a bus line with a common interface following a prescribed rule. SOLUTION: A bus line 16 of a five-bit width, which connects respective slots 12 and a multiplex separation part 15 is formed on a back wire board 11. Respective interface boards 14 interface main signals in a 1.5 M basic path frame units on the back wire board 11, despite of the interface speed of main signals which the boards store. In such a case the main signals from the interface boards 14 at speed exceeding 1.5 Mbps are divided into a plurality of 1.5 M basic path frames. Namely, the signal of 6.3 Mbps interface is stored by using four 1.5 M basic path frames. The signal of 8 Mbps interface is stored by using five frames and the signal of 50 Mbps by using 28 frames.
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