How many SONET NEs can I chain together in an add or drop configuration before the timing becomes degraded?
A. The stratum level traceability of the nth node in an add or drop chain is the same as that in the first node. Also, while timing jitter theoretically increases as the number of nodes is increased, the high quality timing recovery and filtering should allows add or drop chains to be extended to any practical network limit without detectable increases in jitter levels. In practice, the only effects on timing at the nth node will occur whenever high-speed protection switches occur in any of the previous n-1 nodes.
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