Control of hybrid packet rings

Details Control of hybrid packet rings Control of hybrid packet rings

1993-12-13

1995-02-21

Marcelo, Melvin

Multiplex communications

Wide area network

Packet switching

370 8515, 370 942, 370108, H04J 326, H04J 306, H04L 1264

Patent

active

053922816

ABSTRACT:
A hybrid ring network is disclosed having stations capable of transmitting and receiving packet and isochronous data. The ring stations include a latency adjustment buffer (LAB) which stores arriving packet data in one random access memory (PBUF) and both arriving packet and isochronous data in a separate random access memory (IBUF). For retransmission over the ring, packet data is read out only from the PBUF in accordance with the packet's retransmission priority. A LAB may be employed at a slave station and may be pre-programmed with a sufficient latency to compensate for an anticipated insertion or removal of a lobe, without changing the total latency of the ring. When a LAB is employed at a cycle master station the latency of the LAB is controlled by the total ring delay.

REFERENCES:
patent: 4858232 (1989-08-01), Diaz et al.
patent: 5140587 (1992-08-01), Mueller et al.
"FDDI Hybrid Ring Control (HRC)", Draft Proposed American National Standard, May 14, 1991, X3.186-199X, X3T9/89-43, X3T9.5/87-10, Rev. 6-2.

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