Time division switch with inserter and dropper using external memory and time division switching method
AssigneeNEC Corporation
InventorSaburou Ikeda
Life of this patent
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Abstract
The invention provides a time-division switch and a time-division switching method by which a multi-frame signal of an arbitrary bit length can be outputted to or inputted from an arbitrary time slot. The time-division switching method is applied to weitchably connect time slots between different highways in time-division multiplex communication. The switch includes an external memory to which data from input time slots may be dropped, and from which data may be inserted into output time slots. Fixed data such as tone data may also be inserted into time slots. Dropping and insertion may be performed to replace existing time slot data or to fill new time slots.
Claims10
A time-division switching method for switchably connecting time slots of input and output highways to provide time-division multiplex communication, comprising:
- receiving input time slot data associated with input time slots of said input highways and storing said input time slot data in an input time slot data memory;
- designating associations among:
- (1) said input time slots, (2) output time slots of said output highways, and (3) locations in an external memory external to said input time slot data memory;
- and
- producing output time slot data for said output time slots in accordance with said input time slot data and said designated associations, wherein said producing comprises:
- phase conversion, wherein input time slot data of an input time slot stored in said input time slot data memory is used as output time slot data of an associated output time slot;
- insertion, wherein data stored in a location in said external memory is retrieved and used as output time slot data of an associated output time slot;
- and
- dropping of input time slot data, wherein input time slot data of an input time slot stored in the input time slot data memory is moved to an associated location in said external memory.
A time division switch for switchably connecting time slots of input and output highways in time-division multiplex communication, comprising:
- an input time slot data memory for temporarily storing input time slot data associated with input time slots of said input highways;
- an external memory external to said input time slot data memory;
- designating means for designating associations among:(1) said input time slots, (2) output time slots of said output highways, and (3) locations in an external memory external to said input time slot data memory;
- and
- switch control means for producing output time slot data for said output time slots in accordance with said input time slot data and said designated associations, wherein said producing comprises:
- phase conversion, wherein input time slot data of an input time slot stored in said input time slot data memory is used as output time slot data of an associated output time slot;
- insertion, wherein data stored in a location in said external memory is retrieved and used as output time slot data of an associated output time slot;
- and
- dropping of input time slot data, wherein input time slot data of an input time slot stored in the input time slot data memory is moved to an associated location in said external memory.
Dependencies are inferred from the claim text.