Claims
- 1. In a network subject to a previous failure and a subsequent failure, a method for restoring the network comprising the steps of:
overcoming the previous failure using a first protection scheme; detecting the subsequent failure; determining that the previous failure can be overcome using a second protection scheme; determining that the subsequent failure can be overcome using the first protection scheme but can not be overcome by using the second protection scheme; applying the second protection scheme to overcome the previous failure; and applying the first protection scheme to overcome the subsequent failure.
- 2. The method of claim 1 further comprising the step of:
determining that the first protection scheme is unable to overcome the subsequent failure because the first protection scheme has already been applied to overcoming the previous failure.
- 3. The method of claim 1 wherein the first protection scheme is designed to circumvent a failure affecting a span in the network using a spare resource within the span and the second protection scheme is designed to circumvent a failure affecting a span in the network using a resource outside of the span.
- 4. The method of claim 1 wherein the step of determining that the previous failure can be overcome using a second protection scheme is based upon a failure type associated with the failure.
- 5. The method of claim 1 wherein the step of determining that the previous failure can be overcome using a second protection scheme is based upon a whether the previous failure is a module failure or a line failure.
- 6. The method of claim 1 wherein the step of determining that the subsequent failure can be overcome using a first protection scheme is based upon a failure type associated with the subsequent failure.
- 7. The method of claim 1 wherein the step of determining that the subsequent failure can be overcome using a first protection scheme is based upon a whether the subsequent failure is a module failure or a line failure.
Parent Case Info
[0001] This application is a divisional application of pending U.S. application Ser. No. 09/001,884 filed Dec. 31, 1997 the disclosure of which is hereby incorporated by reference.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09001884 |
Dec 1997 |
US |
Child |
09804365 |
Mar 2001 |
US |