Hitless re-routing in composite switches

Details Hitless re-routing in composite switches Hitless re-routing in composite switches

2007-05-29

2007-05-29

Hsu, Alpus H. (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S395700, C370S516000, C398S099000

Reexamination Certificate

active

09941894

ABSTRACT:
A method of the grooming traffic signals through a composite switch is disclosed that enables a traffic signal that is being transmitted between any two constituent switches to be re-routed through the composite switch without a hit (i.e., the dropping, replacing, inserting, or repeating of at least one bit in the traffic signal). This applies whether the constituent switches are adjacent in the composite switch or not. The composite switch in accordance with the illustrative embodiment comprises multiple routes between adjacent constituent switches and incorporates a mechanism that compensates for differential propagation delays along the routes. And still furthermore, the composite switch in accordance with the illustrative embodiment comprises alternative routes through different constituent switches and incorporates a mechanism that compensates for differential propagation delays through the constituent switches.

REFERENCES:
patent: 5825821 (1998-10-01), Okuyama
patent: 6067304 (2000-05-01), Nishioka
patent: 6246668 (2001-06-01), Kusyk
patent: 6535479 (2003-03-01), Ikematsu
patent: 6970480 (2005-11-01), van Heyningen et al.
patent: 2002/0118668 (2002-08-01), Sawey et al.

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