Compare and contrast the following terms: access rate, CIR, CBIR, and BE.
Access rate (or port speed)
- The capacity of the local loop.
- This line is charged based on the port speed between the DTE and the DCE (customer to service provider).
CIR: Committed Information Rate
- The capacity through the local loop guaranteed by the provider.
- Customers normally choose a CIR lower than the access rate to allow them to take advantage of bursts.
CBIR: Committed Burst Information Rate
- The maximum number of frames allowed in a burst.
- It cannot exceed the CIR for the link.
BE: Excess Burst
- The amount of data above the CBIR that the network tries to deliver, up to the maximum speed of the access link.
- Packets over CIR are marked discard eligible (DE), indicating that they may be dropped if the network does not have capacity.
Exam with this question: EWAN v4 Chapter 3 Check Your Understanding: Frame Relay
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