Patent ID: 6256308
Filing Date: 2001-07-03
Classification: H04L,H04Q

Abstract:
A multi-service circuit which receives ATM cells on an external interface from a modem/transceiver, the multi-service circuit being controlled by a processor, the multi-service circuit comprising:plural service devices handling differing telecommunication services;a multiplexer/demultiplexer core connected between the plural service devices and the external interface, the core having:a downstream side for transmitting cells from the external interface to the service devices and an upstream side for transmitting cells from the service devices to the external interface, the downstream side having a downstream demultiplexer and a downstream multiplexer, the upstream side having an upstream multiplexer and an upstream demultiplexer,a downstream loop-back buffer for storing cells routed from the downstream side to the upstream side;an upstream loop-back buffer for storing cells routed from the upstream side to the downstream side;wherein the downstream demultiplexer serves to route cells received from the external interface to one of the downstream loop back buffer, the processor, and an input of the downstream multiplexer;wherein the downstream multiplexer serves to obtain cells from one of the downstream demultiplexer, the upstream loop-back buffer, and the processor for transmission to the service devices;wherein the upstream demultiplexer serves to route cells received from the service devices and from the processor to one of the upstream loop-back buffer, the processor, and a buffering section situated between the upstream demultiplexer and the upstream multiplexer; andwherein the upstream multiplexer serves to obtain cells from one of the buffering section and the downstream loop-back buffer so that the cells are forwarded to the external interface.