| 摘要 |
The present invention relates to a method for the multiple access use of bit-transparent ISDN links by any subscribers and a device for carrying out the method. Normally in ISDN (Integrated Services Digital Network), a dial connection is established individually between subscribers, said connection carrying 64 kbps even over long-distances. That bit rate would be sufficient for the simultaneous transmission of several digitally coded voice signals. In local areas (LSA), devices such as ISDN private branch exchanges are connected to ISDN local exchanges for the purpose of carrying out the method. These devices form what is called an ISDN Link Sharing System (ILSS), reflecting their function. The ILSS elements are connected via bit-transparent dedicated lines which carry the basic traffic. For peak traffic, bit-transparent dial connections are established. All these bit-transparent links are used simultaneously for several links thanks to the use of signal processors to reduce the signal bit rate. Signalling which is also used for forwarding dialling data is exchanged between the ILSS devices, which capture charge data and carry out authorisation checks. The ILSS devices can also be connected between different user networks and indirectly formed into a network via network nodes. |
