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2. UPSR vs. BLSR - Cisco Community

   community.cisco.com/t5/optics-and-optical-networking/upsr-vs-blsr/td-p/9221

   The main difference between UPSR (dedicated protection) and BLSR (shared protection) is the protection scheme and complexity. BLSR is far better, but more complex. 07-17-2002 12:17 PM. UPSR is better in situations where you don't care how many time slots are available on your ring.

3. UPSR and re-use of STS by unprotected traffic?

   community.cisco.com/t5/optics-and-optical-networking/upsr-and-re-use-of-sts-by...

   The short answer is yes they can be mixed and matched. If the ring is UPSR and the circuit is mapped between points A and B, the STS that is used between the 2 slots is used and cannot be used again. So lets say that node A uses slots 6 and 12 (in a 15454) and node B uses slot 6 and 12. The connection is between slot 12 of node A and Slot 6 of ...

4. Working and Protect Paths - Cisco Community

   community.cisco.com/t5/optics-and-optical-networking/working-and-protect-paths/...

   When a UPSR circuit is created, CTC evaluates the available receive paths at each end of the circuit and will select the best available path as its primary path. In the Circuit edit screen any path that has a working direction on it will be shown in green while a protect is shown in purple. When you are seeing Green on both sides of the ring ...