Patent ID: 6633541
Filing Date: 2003-10-14
Classification: H04L,H04Q

Abstract:
An ascending transmission speed controlling method in an ATM-PON (asynchronous transfer mode-passive optical network) system in which said PON system has an optical line termination connected to an ATM network and a plurality of optical network units each of which is connected to a subscriber terminal to thereby send/receive cell information to/from said optical line termination, and accommodates a plurality of communication channels of best effort type in which a communication speed available by a subscriber is not guaranteed when said ATM network is congested; said method being for controlling transmission speeds of ascending cell informations to be transmitted from said plurality of optical network units to said optical line termination; said method comprising the steps of:monitoring, by said optical line termination, receiving states of ascending cell informations from said optical network units, respectively to identify whether said communication channels are in active states, respectively, based on a result of monitoring; extracting, by said optical line termination, backward resource management cells included in descending cell informations, respectively, from said ATM network; allocating, by said optical line termination, ascending transmission speeds on said PON to said communication channels, respectively, based on said identified active/inactive states of said communication channels, a congestion state of said ATM network indicated by said extracted resource management cells, and a maximum transmission speed on said PON; generating, by said optical line termination, ascending transmission grant signals to be transmitted to said optical network units according to said allocated ascending transmission speeds, respectively; and transmitting, by said optical network units, the ascending cell informations from said subscriber terminals to said optical line termination according to said ascending transmission grant signals, respectively, from said optical line termination.