and 508
Control Management
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B
C
D
E
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OLT
Amplifier
Figure 8.14 Example for Problem 8.3.
Draw a time line indicating the behavior of each node in the network after the failure, including the transmission of OCh-FDI and OMS-FDI signals. (b) Now assume that each node detects loss of light in 2 ms, immediately sends an FDI signal downstream, and waits an additional 2 s after the loss of light is detected before it triggers an alarm. Assume the same propagation delay values as before. Redraw the time line indicating the behavior of each node in the network after the failure, including the transmission of OCh-FDI and OMS-FDI signals. What do you observe as the difference between the two methods proposed above? 8.4 Consider an OXC connected to multiple OLTs. (a) If the OXC has an electronic switch core with optical-to-electrical conversions at its ports, what overhead techniques can it use? How would it communicate with other such OXCs in the network? What performance parameters could it monitor? (b) If the OXC is all optical, with no optical-to-electrical conversions, what overhead techniques can it use? How would it communicate with other such OXCs in the network? What performance parameters could it monitor? Consider the open ber control protocol in the Fibre Channel standard. (a) How would you choose the parameters and as a function of the maximum link propagation delay dprop? (b) What is the time taken for a node to go from the DISCONNECT state to the ACTIVE state, assuming a successful reconnection attempt, that is, it never has to go back to the DISCONNECT state?
8.5
References
[ABG+ 01] D. Awduche, L. Berger, D. Gan, T. Li, V. Srinivasan, and G. Swallow. RSVP-TE: Extensions to RSVP for LSP Tunnels. Internet Engineering Task Force, Dec. 2001.
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