| 摘要 |
PCT No. PCT/GB95/00128 Sec. 371 Date Nov. 7, 1996 Sec. 102(e) Date Nov. 7, 1996 PCT Filed Jan. 24, 1995 PCT Pub. No. WO95/20846 PCT Pub. Date Aug. 3, 1995An Add-Drop Multiplexer (ADMUX) for use in a synchronous digital hierarchy telecommunication system is provided with a by-pass whereby, in use, it can be made to interface with a higher bit rate transmission system.
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