Telefonaktiebolaget Lm Ericsson (publ)

Magnus Hallenst&aring;l

Tomas Nylander

Ros-Marie Furtenback

Michael Ranjel

Jan Alvar Gj&auml;rdman

ATM is used as a transport and switching mechanism in a hybrid STM/ATM network ( ), while the signaling remains normal narrowband signaling. The narrowband signaling is transported on permanent paths over ATM connections, and the narrowband speech channels are transported on ATM and switched on a &ldquo;per call basis&rdquo; (on-demand) through an ATM switch. The hybrid STM/ATM network has an access node ( ) which services narrowband terminals and which generates a signaling message in connection with call setup. A translator ( ) formats the first signaling message into ATM cells so that the first signaling message can be routed through an ATM switch ( ) to a circuit switched (STM) node ( ). The circuit switched node (PSTN/ISDN) sets up a physical connection for the call and generates a further signaling message for the call, the further signaling message pertaining to the physical connection. The ATM switch routes an ATM cell-formatted version of the further signaling message to another ATM switch over an ATM physical interface ( ). Thus, the ATM switch switches both narrow band traffic and signaling for the call over the ATM physical interface.

Narrowband applications using ATM switching and transport

The present invention relates to a method for telecommunications and a device for that method. A first time slot is assigned for a first channel (,) between a first local exchange (LEA) to which a first subscriber (A) is connected or is being connected, and a second local exchange (LEB) to which a second subscriber (B) is connected or is being connected. A second time slot is assigned for a second channel (,) between the first local exchange (LEA) and a third local exchange (LEC) to which a third subscriber (C) is connected or is being connected. The first subscriber (A) makes a request that the second subscriber (B) and the third subscriber (C) shall continue to be or shall become connected, while the first subscriber (A) is disconnected. According to the invention, a transmitter (,) sends at least one tone in one of the time slots, a timer (,) is started and a receiver (,) listens in the other time slot. If the receiver (,) has not detected the tone before the timer (,) has elapsed, the request is executed.

Growing community of inventors

Täby, Sweden

Magnus Hallenstål

Growing community of inventors

Täby, Sweden

Magnus Hallenst&aring;l

Magnus Hallenstål