Method of controlling parameter downloading from a communication switching system to customer stations
AssigneeAT&T Bell Laboratories
InventorsDouglas E. LeDuc, Ravindranath Madhavan
Life of this patent
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Abstract
A method for use by a switching system in controlling the downloading of parameters to customer stations. The notification of stations due to a change in a configuration group is performed at a controlled rate and accordingly any reduction in call processing due to the parameter downloading of customer stations is limited. The controlled rate notification is performed in accordance with two lists that are maintained by the switching system and used to track the active/inactive status of customer stations and to order the notification of active stations and the status checking of inactive stations.
Claims13
A method for use by a switching system in controlling the downloading of parameters to customer stations, said method comprising
- maintaining a first list of customer stations to which parameters are to be downloaded from said switching system,
- maintaining a second list of customer stations to which parameters are to be downloaded from said switching system,
- A) determining whether a given customer station on said first list is in an active status,
- B) upon determining that said given customer station is in an active status, downloading parameters to said given customer station,
- C) upon determining that said given customer station is in an inactive status, moving said given customer station to said second list and
- D) repeating, for successive customer stations on said first list, step A) and, dependent on the status of each successive one of said customer stations, either step B) or step C) at a rate that is established such that any reduction of call load capacity of said switching system due to parameter downloading is within a predefined limit.
A method for use by a communication switching system, said method comprising
- processing calls and
- concurrently with said processing and in response to a change to data stored by said switching system, determining a plurality of customer stations to which said data is to be downloaded, placing said plurality of customer stations on a first list, checking, at a controlled rate, each customer station on said first list to determine its active/inactive status and downloading said data to those of said customer stations which were checked and determined to be active,
- where said controlled rate limits any reduction in said processing by said switching system due to data downloading.
A method for use by a switching system in controlling the downloading of parameters to customer stations, said method comprising
- maintaining a first list of customer stations to be notified to request a download of parameters from said switching system,
- maintaining a second list of customer stations to be notified to request a download of parameters from said switching system,
- A) determining whether said first list is empty,
- B) upon determining that said first list is not empty, determining whether the first customer station on said first list is in an active status, upon determining that said first customer on said first list is in an active status, notifying said first customer station on said first list to request a download of parameters from said switching system, and upon determining that said first customer on said first list is in an inactive status, moving said first customer on said first list to the end of said second list,
- C) upon determining that said first list is empty, determining whether the first customer station on said second list is in an active status, upon determining that said first customer station on said second list is in an active status, moving said first customer station on said second list to said first list, and upon determining that said first customer station on said second list is in an inactive status, moving said first customer station on said second list to the end of said second list, and
- D) repeating steps A) through C) at a rate that is controlled such that any reduction of call load capacity of said switching system due to parameter downloading is limited.
Dependencies are inferred from the claim text.