| 摘要 |
PCT No. PCT/FI90/00233 Sec. 371 Date Apr. 5, 1991 Sec. 102(e) Date Apr. 5, 1991 PCT Filed Sep. 28, 1990 PCT Pub. No. WO91/05425 PCT Pub. Date Apr. 18, 1991.A digital data transmission system comprising a data transmission network formed by several node stations (A1-A4) and interconnecting high-speed trunk lines (1-5). Each node station comprises several low-speed parallel subscriber interfaces controlled by a network management system (6), subscriber stations (B1-B5) being connectable to the subscriber interfaces either directly or through a serial modem link (10-13), depending on the distance. The network management can be extended up to the subscriber stations so that said modem link (10-13) transfers all signals of the parallel subscriber interface in serial form in both directions, forming, at the end close to the subscriber station (B2-B5), a parallel slave interface corresponding to the subscriber interface.
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