摘要:
A telecommunications network architecture provides transport and switching of user services, particularly PSTN/ISDN services. In the network, connections are set up between end points which typically comprise narrow band exchanges serving subscribers. Calls are set up between the end points via call servers using e.g. ISUP signalling between the end points or exchanges and the call servers. The call servers set up connections via a concatenated series of paths or tunnels across an intermediate MPLS network via media gateways serving respective nodes in the MPLS network. User information packets are carried across the MPLS network by the attachment of an appropriate label, this label being removed on egress from the MPLS network to recover the original packet.
摘要:
A network arrangement for transporting service (Servco) traffic between terminals via an asynchronous path comprises a servco access layer incorporating multimedia gateways for access by said terminals, an asynchronous network layer, a service layer incorporating adaptation layer switches each coupled to the network layer, and a transport layer providing a connection medium between the adaptation layer switches. The Servco traffic is carried in ATM minicells over the network layer. Delineation of the minicells is effected by searching the received ATM stream for a valid code word indicating the start of a minicell, and, for that minicell and subsequent minicells, determining length information so as to determine the start of each next minicell.
摘要:
Interconnection of a multimedia terminal (110) of a narrowband, LAN-type network (10) to an exchange (118) and thence to an end-point (119) is orchestrated through an intermediate network (142), as shown in FIG. 5. A route (115) to the exchange (118) is initially established by a call handler (116) in responsive to a called party number of the end-point, before a connection supervisor (120), coupled to the call handler (116), sets up a control channel across the intermediate network (142). The control channel supports the communication of control messages between the multimedia terminal (110) and the end-point (119), which control messages are intercepted and interpreted by the connection supervisor (120). The connection supervisor (120) then establishes media paths through the intermediate network (142) dependent upon types of control message sent across the control channel, which media paths are used to transfer traffic components across the intermediate network.
摘要:
A telecommunications system comprises an asynchronous transfer mode (ATM) network having uncommitted bandwidth, and a plurality of adaptive grooming routers (AGR) coupled to the network. The AGRs comprise a group adapted to function as a virtual transit exchange whose fabric and control are distributed over the group. The visual comprising the AGRs incorporates independent connection control and call routing functions and has means for determining the current system status whereby to set up narrow band connections across the ATM network based on that status determination.
摘要:
Voice and media services are provided over an IP network incorporating a plurality of nodes and in which connection oriented traffic is transported in tunnels via said nodes. SS7 signalling is provided between nodes. The voice and media components are multiplexed to form a point to point protocol (PPP) session which is switched end to end across the network under the control of the signalling.
摘要:
An asynchronous transfer mode adaptation layer switching network has independent call routing and connection control for setting up connections across the system. A plurality of adaptation layer switches (ALS) coupled to the ATM network comprise a group adapted to function as an adaptation layer switching network whose fabric and control are distributed over the group. The network having means for determining its current system status whereby to set up multimedia calls across the network based on that status determination.
摘要:
An ATM communications system incorporates both broadband and narrowband services. A plurality of channels are adapted into groups, each group comprising a virtual circuit for transmission purposes. Each group is subsequently readapted back to individual channels. Any channel can be connected with any virtual circuit and each group of channels comprising a virtual circuit maintains time slot integrity throughout the adaptation and transmission process.
摘要:
An integrated broadband and narrowband access arrangement, includes a multiplexed ATM adapter and an ATM core. The ATM core terminates a broadband access system and a narrowband access system whereby to deliver ATM cells to a SDH/ATM trunk or to the adapter. The services comprising the narrowband system are terminated each by a respective adapter providing an individual virtual circuit connection to the multiplexed adapter. The narrowband services within that virtual circuit having permanently assigned time slots whereby to retain time slot sequence integrity throughout the adaptation process.
摘要:
Narrowband subscriber terminals (40,52,58) of different narrowband networks are interconnected via a broadband network (48) that supports dissimilar signaling protocols to those maintained on the respective narrowband networks (40,52,58). A call server in a first narrowband network (40), in response to a call (100) from a first subscriber terminal (12) to a second subscriber terminal (68) in a second but different narrowband network (52), selects a phantom trunk (202) between the two networks. The phantom trunk has a unique circuit identity, which circuit identify is used in a first instance to relay to the second network an address of the second subscriber terminal (68). Then, in a second instance, the unique circuit identify is used to relay to the second network an address of the first subscriber terminal (68). By recognizing that two connection requests have been received at opposite ends of the same phantom trunk, a processor in the second network is able to determine that a direct connection between the first and second subscriber terminals is required through the broadband network (48).
摘要:
A telecommunications system comprises an asynchronous transfer mode (ATM) network having uncommitted bandwidth, and a plurality of adaptive grooming routers (AGR) coupled to the network. The AGRs comprise a group adapted to function as a virtual transit exchange whose fabric and control are distributed over the group. The virtual comprising the AGRs incorporates independent connection control and call routing functions and has means for determining the current system status whereby to set up narrow band connections across the ATM network based on that status determination.