| 摘要 |
<p>A fiber optic synchronous digital hierarchy telecommunication network provided with a protection system shared on the network is described, which comprises spans of pairs of optical fibers (Nx2F) having network elements (Nx2F-SDHNE) interposed therebetween, wherein the spares of pairs of optical fibers have a variable number N (N=1, 2, 3, ...) of pairs, and the network elements (Nx2F-SDHNE) feature variable interconnection capability between said spans, so that several spans having number N of pairs of optical fiber even different can be connected to at least some of said network elements. <IMAGE></p> |
