Timing synchronization and switchover in a network switch

Details Timing synchronization and switchover in a network switch Timing synchronization and switchover in a network switch

1997-08-28

2000-06-20

Pham, Chi H.

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

370219, H04J 306

Patent

active

060785950

ABSTRACT:
A data communications switch and method of operation are presently disclosed enabling flexible, selectable provision of a common timing signal for synchronized external communication through physical layer interfaces with other network devices, synchronized internal communications within the switch, and for uninterrupted synchronization of such communications. Synchronization of external communications is enabled by programmable selection from among plural potential timing references at redundant timing modules (TMs). An active TM provides a primary external synchronization clock; a standby TM provides a redundant timing function. Both TMs access the same references. A state signal indicates which synchronization clock is active. External interfaces derive timing from this distributed clock. Synchronized internal timing is provided by an internal clock and phase-locked loop (PLL) on each TM. The clock/PLL timing signal output is routed to other switch elements, enabling synchronized internal data transfer. Both interconnected TMs actively generate clock signals for external and internal use, enabling seamless timing switchover should conditions warrant a change in TMs.

REFERENCES:
patent: 5515403 (1996-05-01), Sloan et al.
patent: 5638410 (1997-06-01), Kuddes
patent: 5726607 (1998-03-01), Brede et al.

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