Communications network

Details Communications network Communications network

Category

H - Electricity

Subcategory

04

Subsubcategory

L

CPC

363/22

IPC codes

H04L 12/64 (2006.01) H04L 12/43 (2006.01)

Type

Patent

Patent number

CA 1264877

Description

ABSTRACT COMMUNICATIONS NETWORK A network for carrying real-time (RTS) and data services comprises stations (12) on a ring (11). Frames on the ring have a fixed boundary (15) between a real-time portion of the frame and a data portion. A sequence of cycles is initiated by a priority station. During a refresh cycle a bit map on the ring is marked by each station in turn to indicate which slots in the real-time portions are occupied. Next the stations bid for slots needed for new calls. During a third cycle information transfer for RTS calls takes place. After these cycles, priority is passed to the next station. The data portion may use a slotted ring or token ring data control protocol, and data transfer proceeds during RTS cycles. In an alternative version the boundary (15') may be relocated periodically depending on the level of real-time traffic.

Application Number

513898

Affiliated with

Also associated with

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