Überlastreduzierungssystem im Nachrichtenübermittlungssystem

摘要

A congestion relieving system in a communication system comprises a local switch (62a) and a customer station including a network terminator (64a) connected to the local switch (62a) and a plural data receiving/transmitting units connected to the network terminator (64a) through buses (67D and 67U) conformable to a DQDB protocol, the local switch (62a) comprising congestion relieving signal generating unit for generating congestion relieving signal when congestion is detected, the congestion relieving signal being inserted, as a request bit, into a request bit area in the cell having a format conformable to the DQDB protocol, the cell being transmitted from the local switch (62a) through the network terminator (64a) to the data receiving/transmitting units, whereby each data receiving/transmitting unit is restricted, under the DQDB protocol, to transmit data, when the data receiving/transmitting unit receives the request bit.