公开(公告)号：AT404001T

公开(公告)日：2008-08-15

申请号：AT01976198

申请日：2001-09-06

Applicant: IBM

Inventor： WIND DANIEL ,  ROMAN THIERRY ,  BLANC ALAIN ,  BREZZO BERNARD ,  GALLEZOT RENE ,  LE MAUT FRANCOIS

IPC: H04L12/18 ,  H04L49/111

Abstract: A data switch is provided which routes fixed-size data packets from input ports to output ports, using shared memory which holds a copy of each packet in buffers. Output ports have a queue which contains pointers to buffers holding packets bound for that port. The number of shared memory buffers holding packets is compared to the number of buffer pointers in the output queues. In this way, a Multicast Index (MCI), a metric of the level of multicast traffic, is derived. The switch includes a Switch Core Adaptation Layer (SCAL) which has a multicast input queue. Because traffic is handled based on priority class P, a multicast threshold MCT(P), associated with the multicast input queue, is established per priority. While receiving traffic, the MCI is updated and, for each priority class in each SCAL, the MCI is compared to the MCT(P) to determine whether corresponding multicast traffic must be held.

公开(公告)号：DE3874517T2

公开(公告)日：1993-04-08

申请号：DE3874517

申请日：1988-01-22

Applicant: IBM

Inventor： GRANGER YVES ,  WIND DANIEL

IPC: G06F13/22 ,  G06F13/38

Abstract: A line-adapter (1) of a communications controller includes, for scanning the teleprocessing lines (26) connected to it, cyclic scanning means FES (10) exchanging information with the lines (26) through a serial bidirectional link (12) on which data and control informations are partitioned into frames and slots. Since both the FES (10) and the serial link work with their own timings, an interface FESA (11) is provided to adapt the FES scanning to the serial link (12) structure. This FESA (11) includes temporary storage means (36, 38, 40, 42) for storing on the one hand, data and control information transmitted from t (24), and on the other hand, data and control information transmitted from the FES (10) to the LICs through the outbound serial link (22). The access of the FES, the outbound and inbound serial link to the storage means is time-shared and granted by an arbitration logic, according to the relative priorities of operation of said elements within the line-adapter (1) of the communications controller.