Mobile Communications Network -7.ATM Switching System

Under the third-generation IMT-2000 services, high-speed and large-capacity multimedia data will be delivered through the network and a wide variety of network services such as global roaming will be provided at the same time. Supporting these IMT-2000 services on the NTT DOCOMO core network is the ATM switching system.

ATM (Asynchronous Transfer Mode) divides data into fixed-length cells that can be transmitted at hardware speed. A logical channel number is assigned to the cell head, and low-speed services such as voice communications to high-speed services such as moving pictures can be efficiently transmitted through multiplexing.

With its advanced service menu, the IMT-2000 network is required to provide not only mobility management for individual terminals but also various service control functions. And with capabilities such as QoS (Quality of Service) in which the desired communications quality is individually established for each communications session, the ATM switching system provides for a sophisticated and economic network configuration.

figure

NTT DOCOMO's IMT-2000 Core Network Using ATM

noticeCreated 2001/03

noticeUpdated 2002/03

Go to top of the page