| 摘要 |
A telecommunication carrier processor subsystem (CPS) adapted to receive cells (1, 2), preferably ATM cells, and to derive from the H-bit header field thereof a smaller set of R bits. The set of R bits is not only used to route the cell to a predetermined output of the subsystem but is also combined with a second set of D bits for replacing the VPI/VCI bits in the H-bit header field of the cell. The second set of D bits may be used for transmitting information data such as user data, control or command transmission. It may also be used for hand-over process or cell duplication and is then particularly suited for broadband local access applications relating to low earth orbit satellite constellations. Preserving the global ATM cell header size while using the freed D bits after changing the connection identifier range is called in-band control. It allows using off the shelf components for the cell transmission between sub-systems, boards or components. It also leads to the reduction of Connection Data Tables in coherence with the dimensioning required for a processing unit. <IMAGE> |
