How many SONET NEs can I chain together in an add/drop configuration before the timing becomes degraded?
A. The Stratum level traceability of the nth node in an add/drop chain is the same as that in the first node. Also, while timing jitter will theoretically increase as the number of nodes is increased, the high quality timing recovery and filtering should allows add/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 protectionswitches occur in any of the previous n-1 nodes.
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