Abstract: The present invention provides a facility transport system for transporting Ethernet over digital subscnber lines. The system, termed 10BaseS, is capable of transmitting 10 Mbps Ethernet over existing copper infrastructure. The system utilizes carrierless amplitude modulation/phase modulation (CAP), a version of suppressed carrier quadrature amplitude modulation (QAM). The 10BaseS transport facility can deliver symmetrical data at approximately 13 Mbps (net 10 Mbps) over the unscreened, twisted pair telephone wires originally intended for bandwidths between 300 Hz and 3.4 KHz. The system utilizes frequency division multiplexing (FDM) to separate downstream channels from upstream channels. FDM is also used to separate both the downstream and upstream channels from POTS signals. The downstream and upstream data channels are separated in frequency from bands used for POTS and ISDN, enabling service providers to overlay 10BaseS on existing services.

Abstract: A novel method of routing and performing autoconfiguration in an ATM network is disclosed. The method simplifies the configuration and routing for ATM networks having a relatively large number of nodes. Networks are constructed in hierarchical fashion in the form of branches and trees and assigned network address prefixes in accordance with their location in the network. Network nodes periodically exchange identification information permitting both switches on either side of a link to be aware of who they are connected to. Each node registers a network address and its associated significant length for each of its neighbors on each of its links. A node performs routing by comparing the destination address against each of its registered addresses for all its links. The routing method takes advantage of the network address prefix to ensure that the routing proceeds in the correct direction towards the destination and does not enter a tree or a branch that does not contain the destination.

Abstract: A system of monitoring and protecting integrated circuits against damage due to over temperature conditions functions to monitor the temperature of an IC and either shut down its input clock signal or assert its reset line if case temperatures rise to high. Heat dissipated by an integrated circuit is sensed by a temperature sensor. The temperature sensor is thermally coupled to the integrated circuit via thermal glue or other thermally conductive means. The output of temperature sensor is input to temperature sensor circuitry which converts the low level output of the temperature sensor into a signal that can be read by a processor. The processor is suitable programmed to monitor the output of temperature sensor circuitry. When the temperature of the integrated circuit rises past a predetermined threshold value, the processor outputs a control signal to the clock generator circuitry causing it to switch off its clock signal input by the integrated circuit or asserts the chips reset line.