Switching system for electronic switcher
AssigneesHitachi, Ltd., Hitachi Software Engineering Co., Ltd.
InventorsMasashi Hiraiwa, Yoshiaki Asambo
Life of this patent
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Abstract
A switching control system is provided for an electronic switcher employing a common channel signalling. This system is designed to keep the common channel signalling for a speech path in parallel to the associated signalling system, invalidate the speech information in the associated signalling system for a speech path if the signal link is in a normal state and control the speech path in the common channel signalling system, and if failure takes place on the signal link, control the speech path in the associated signalling system.
Claims11
A switching system for selectively controlling a call control of a group of speech paths between exchange offices comprising:
- first control means for executing the call control of the group of speech paths by a common channel signalling;
- second control means for executing the call control of the group of speech paths by a channel-associated signalling for performing transmission of information necessary for controlling connection between the exchange offices through respective speech paths;
- means for monitoring a failure on a common channel signal link which forms a signal path established separately from the speech path for transmitting the information necessary for controlling the connection between the exchange offices and is used for the call control of the group of speech paths;
- said common channel signal link being comprised of a transmission path for tranferring signalling information for the call control between the exchange offices;
- and
- means for selectively changing over the call control between the first control means including the common channel signalling and the second control means including the channel-associated signalling wherein the changing over means includes means for selectively changing over, responsive to detection of the failure on the common channel signal link by the monitoring means, the call control of the group of speech paths which are controlled by the common channel signalling so as to be controlled by the channel-associated signalling and, responsive to a determination that the common channel signal link is normal, selectively changing back the call control to common channel signalling.
A switching method for an electronic switcher comprising the steps of:
- controlling a particular group of speech paths maintaining a common channel signalling system and a channel-associated signalling system in a parallel relationship;
- maintaining switching information in the channel-associated signalling system as ineffective information if a common channel signal link is in a normal state;
- performing switching control in the common channel signalling system;
- performing the switching control in the channel-associated signalling system if a failure takes place on the common channel signal link;
- and
- changing back the switching control to the common-channel signalling system upon recovery of the failure.
Dependencies are inferred from the claim text.