Abstract: Mobile terminated calls arriving at a network access server configured as an Interworking function (IWF) are routed to a particular modem in the network access server by means of a table maintained at the interface to a communications network receiving the call. The table maps called party numbers (or call reference values uniquely assigned to each call) to a particular modem channel number and slot number for a modem that has already been assigned to the call.

Abstract: An ATM transmission system without having a dedicated line for transmitting maintenance information between subsystems constituting the ATM transmission system. The ATM transmission system introduces the idea of a multiframe for transmitting ATM cells, and transmits the maintenance information by inserting it into an overhead portion of the multiframe. This enables the number of lines interconnecting the subsystems to be reduced. The ATM transmission system includes in its interface circuit a set of parallel processors of the same configuration. The number of the parallel processors equals the least common multiple of ratios between the minimum interface rate and one or more other interface rates of other ATM transmission subsystems interconnected to the ATM transmission system. This enables the subsystems with different interface rates to become the interconnected ATM transmission system.

Abstract: A method for implementing bandwidth reservation in an electronic network comprises the setup of a new connection between at least two nodes in a network, while preventing the overload of individual nodes, and the overload of the network bus, or a radio network. In one embodiment, the present invention is implemented through the use of a plug traffic list for each node to indicate the total capability to sink and/or receive, the outgoing communications, and the incoming communications. The invention also preferably includes a bus traffic list to indicate the load of the network bus. According to the present invention, a node that wishes to establish a new communication preferably first determines whether all nodes that are planned to participate in the new connection have enough capacity to handle the additional plug traffic, whereafter the capacity of the network bus is checked.

Abstract: A new architectural arrangement for network elements deployed in a central office (CO) is disclosed. The architectural arrangement involves dividing the network elements into an optical layer comprised of elements that have optical signal interfaces and switch optical signals, an opto-electrical layer comprised of elements that have optical signal interfaces and switch electrical signals, and an electrical layer comprised of elements that have electrical signal interfaces and switch electrical signals. The opto-electrical layer connects the optical and the electrical layer, and also connects lower-rate optical links into the CO. This layered architectural arrangement allows for more efficient use to be made of the small number of high-rate ports supported in the optical layer, and for the off loading of switching responsibility from both the optical and the electrical layers. This, in turn, improves the overall performance and capacity of the CO.

Abstract: Network routing apparatus employs multi-level tree data structures in a centralized routing table and in distributed forwarding tables. Each level of each structure is associated with a different field of a network address appearing in received packets. Pointers in each structure are used to identify either an address of a next hop network, or a next-level tree to be examined for a next-hop address. An uncompressed tree routing table uses directly addressed trees in order to simplify the storage and retrieval of pointers, and the next-tree pointers directly identify next trees. Compressed tree forwarding tables are generated from the uncompressed routing table by reducing the number of pointers stored at one or more levels to substantially the number of unique next hop addresses associated with network addresses at that level. A single mapping table maps pointer values at one level to the locations of trees at the next level in the compressed trees.

Abstract: In a method for monitoring the through-connect paths in digital switching equipment, the data bytes to be through-connected are divided into at least two halves and are through-connected via parts of the through-connect means of the switching equipment that are independent of one another. At least one of the parts of the data byte is accompanied by a parity bit that relates either to the parity of the entire data byte or to the parity of respectively one of the other parts of the data byte. A reunification of the parts of the data byte and a corresponding parity check occur after the through-connection. Selection or drive errors can also be recognized, and the error location can be localized in this way with a parity check.