| 摘要 |
<p>A matrix switching system ha N inputs and M outputs and three stages (F, M, L) of matrices. The first stage (F) includes n substage matrices (10a...10q), each with x inputs (16a...16q) and x outputs (18a...18q) where N equals nx. The second stage (M) provides x substage matrices (12a...12p) each with n inputs (20a...20p) and m outputs (22a...22p), an output (18a...18q) from each first substage matrix (10a...10q) being connected to an input (20a...20p) of each second stage matrix (12a...12p). A third stage (L) employs m substage matrices (14a...14q) each with x inputs (24a...24q) and x outputs (26a...26q) where M = mx, an output (22a...22p) from each second stage (M) being connected to an input (24a...24q) of each third substage matrix (14a...14q). Switching means are provided at each node of each substage matrix. Means are provided for choosing a proper sequence of switches to reach a selected output to be connected to a selected input.
<??>By the addition of an extra input and output to each substate (12a...12p) of the second stage (M) with output to input connections between all substages of that stage, it is possible to connect an input from one substage to an output in another. Such an arrangement in the middle stage of the three stage matrix, known as a midstage link (21), allows conditionally non-blocked re-routing in situations where a substage appears to be blocked. </p> |
