Regarding the ADSL rate limit in the UA5000, which of the following statements is incorrect?

Question

Options

• AADSL rate limit can use port rate limit or PVC rate limit.
• BSet the PVC UPC switch to ON when using port speed limit.
• CSet the PVC UPC switch to ON when using PVC speed limit.
• DPort speed limit is to limit the flow through the maximum uplink and downlink speed set when the

• A
  2% (1)
• B
  76% (32)
• C
  7% (3)
• D
  14% (6)

Explanation

Option B is incorrect because when using port speed limit, the PVC UPC (Usage Parameter Control) switch should be set to OFF, not ON. Port-level rate limiting already controls traffic at a higher layer, so enabling PVC-level UPC policing simultaneously would create conflicting or redundant traffic control - the two mechanisms would interfere with each other.

Why the distractors are correct (and not the answer):

• A is a true statement - UA5000 ADSL rate limiting supports both port-based and PVC-based approaches, giving administrators flexibility.
• C is also true - PVC speed limit works through the UPC mechanism, so UPC must be ON for PVC-level policing to function.
• D, though truncated, correctly describes port speed limit as capping the maximum uplink/downlink throughput on a physical port.

Memory tip: Think of it as a toggle - Port limit and PVC UPC are mutually exclusive modes. Use the phrase "PVC UPC = ON only for PVC" to remember that UPC belongs with PVC rate limiting, and must be OFF when the port is doing the limiting instead.

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