| 摘要 |
PCT No. PCT/GB87/00525 Sec. 371 Date May 20, 1988 Sec. 102(e) Date May 20, 1988 PCT Filed Jul. 22, 1987 PCT Pub. No. WO88/00786 PCT Pub. Date Jan. 28, 1988.A security arrangement for a telecommunications system having two security planes, a plurality of peripherals, a plurality of peripheral communication controllers; and switching arrangements interconnecting the peripheral communication controllers. To determine a faulty security plane, a duplex path is provided between the controllers, and, using this path, a controller automatically performs path checks on one of the security planes. If the plane is found to be not faulty, the controller sends data associated with that plane to the peripheral with which it is in communication.
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