Abstract: In a gigabit-capable passive optical network (GPON) and a method for bandwidth allocation in the GPON system, when an optical network unit (ONU) requests a bandwidth less than its preset minimum bandwidth, the requested bandwidth is allocated to the ONU. When there are traffic-container (T-CONT) classes of ONUs not allocated bandwidth after the requested bandwidth allocation, a spare bandwidth after the requested bandwidth allocation is dynamically allocated to the T-CONT class of each ONU according to a weight of each T-CONT class and a percentage of each T-CONT buffer queue. Thus, in the short term, upstream channel transmission according to T-CONT priority in a congested state can be ensured, and, in the long run, network traffic congestion can be prevented.

Abstract: In a gigabit-capable passive optical network (GPON) system and in a method for bandwidth allocation in a passive optical network (PON) system, a minimum bandwidth is allocated to optical network units (ONUs) for minimal transmission assurance dependent on a traffic characteristic of each ONU, and when there is a traffic-container (T-CONT) class of an ONU not allocated bandwidth after minimum bandwidth allocation to all ONUs, an extra bandwidth remaining after minimum bandwidth allocation is dynamically allocated to each T-CONT class according to a weight of the T-CONT class. Thus, efficient bandwidth allocation, considering fairness between ONUs and priority of each T-CONT, is realized.

Abstract: An add/drop cross connection apparatus of an SDH system, comprises an aggregate unit matching device for providing matching with the aggregate units, a higher order path connection circuit for subjecting received higher order path data to cross connection by space switching, a lower order path connection circuit for subjecting received lower order path data to cross connection by space switching, and a selector for selectively delivering the data supplied from the aggregate units, higher order tributary device, and lower order tributary device, wherein the selector delivers the data to the higher order path connection circuit or lower order path connection circuit according as the data is the higher or lower order path data.

Abstract: An add/drop cross connection apparatus of an SDH system, comprises an aggregate unit matching device for providing matching with the aggregate units, a higher order path connection circuit for subjecting received higher order path data to cross connection by space switching, a lower order path connection circuit for subjecting received lower order path data to cross connection by space switching, and a selector for selectively delivering the data supplied from the aggregate units, higher order tributary device, and lower order tributary device, wherein the selector delivers the data to the higher order path connection circuit or lower order path connection circuit according as the data is the higher or lower order path data.