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Working and Protect Paths - Cisco Community UPSR PPMN - For each direction of the circuit (go and return), the signal is split (working and protection) and sent through two paths through the network At the end of the circuit, the two signals are received and a selector switch decides which signal is better Thus, the working a protection signals are always present
UPSR vs. BLSR - Cisco Community UPSR is better in situations where you don't care how many time slots are available on your ring If you have more than 5 or 6 drop nodes on the ring BLSR may provide you with more circuits on the ring As long as everything is provisioned correctly, both configurations offer the same degree of protection
UPSR and re-use of STS by unprotected traffic? Assuming 4 nodes - A, B, C, and D, connected in SONET ring running UPSR According to a Cisco press book, if a STS is mapped between two nodes (say A and B), then that STS is consumed for the entire ring and cannont be used to add drop traffic elsewhere However, the same book also mentioned that yo
