| 摘要 |
PCT No. PCT/GB97/02161 Sec. 371 Date Mar. 10, 1998 Sec. 102(e) Date Mar. 10, 1998 PCT Filed Aug. 12, 1997 PCT Pub. No. WO98/08346 PCT Pub. Date Feb. 26, 1998A telecommunications network includes local switches, main switches and access lines. A switching unit which takes the form of a computer with switching capability is connected to the local switch on a 30 channel ISDN link. In order to form a private circuit between two access lines, the following operations are performed. At local switches, access line are physically connected to free local switch lines. At each of the local switches, an engineer uses the free local switch line which has just been connected to an access line to make a call to the switching unit. The switching unit captures the CLI of this local switch line. The engineer then enters an identifier for the private circuit which is to be formed and instructs the switching unit to form a private circuit. The switching unit then calls these two free local switch lines and then forms the private circuit by connecting the local switch lines together within itself.
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