Hybrid time-slot and sub-time-slot operation in a...

Details Hybrid time-slot and sub-time-slot operation in a... Hybrid time-slot and sub-time-slot operation in a...

H - Electricity

04

Q

H04Q 11/04 (2006.01)

Patent

CA 2210841

A port circuit for a time-division multiplexed (TDM) switching system is designed to effect sub-time-slot operation without external support, as well as to effect conventional time slot operation. A clock-frequency multiplier, such as a frequency-multiplexed phase-lock loop (PLL), and a multiplier-driven sub-time- slot operation circuit, such as a PLL-driven finite state machine, are incorporated into the port circuit. The clock-frequency multiplier and the sub-time-slot operation circuit generate all the additional control signals that are necessary to define sub- time-slots and to effect multiple information transfers in a single time slot. The port circuit engages in conventional time slot transfers with conventional port circuits, whereby it is compatible therewith, and engages in sub-time-slot transfers with other sub-time-slot enabled port circuits, whereby it increases the transfer throughput of the TDM switching fabric. The sub-time-slot operation is selectively enabled and disabled on a per- time- slot basis.

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