Method and apparatus for round trip delay measurement in a...

Details Method and apparatus for round trip delay measurement in a... Method and apparatus for round trip delay measurement in a...

2007-10-23

2007-10-23

Nguyen, Brian (Department: 2616)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S252000

Reexamination Certificate

active

10205793

ABSTRACT:
The link round trip delay between two switches in a Fibre Channel network may be determined by sending a particular timing signal value from an originating switch to a responding switch. The responding switch may store the timing signal value in an “echo” register for comparison to subsequently received timing signals. The originating switch may then send the pre-selected timing signal to the responding switch while simultaneously starting a timer. When the responding switch receives the timing signal, it may compare the value of the received signal to that stored in its echo register. If the value, is the same, the responding switch may retransmit—i.e., echo—the timing signal to the originating switch. When the originating switch receives the echoed timing signal, it may stop its timer and compute the link round trip delay time. The computed link round trip delay time between the originating switch and the responding switch may be advantageously used in fabric routing algorithms.

REFERENCES:
patent: 5959568 (1999-09-01), Woolley
patent: 6751198 (2004-06-01), McPherson et al.
patent: 6952419 (2005-10-01), Cassiday et al.
patent: 2002/0120727 (2002-08-01), Curley et al.
patent: 2003/0048754 (2003-03-01), Bruckman
ANSI X3.272-1996 Fibre Channel—Arbitrated Loop (FC-AL) pp. 14-18 (FC-AL Primitive Signals and Sequences).
Fibre Channel—Physical and Signaling Interface (FC-PH) Rev 4.3 working draft Jun. 1, 1994; Ordered sets pp. 81-89; Table 25 Primitive Signals p. 71; Table 26 Primitive Sequences p. 71; Table 27 Primitive Sequence Summary p. 87.

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