Which type of dynamic bandwidth assignment (DBA) is usually used for configuring AR services?
Correct Answer: B
Dynamic Bandwidth Assignment (DBA):
DBA dynamically allocates upstream bandwidth among ONUs based on their traffic demands.
Different DBA types are used for different service requirements.
DBA Types:
Type 1: Fixed bandwidth allocation, suitable for constant bit-rate services like voice.
Type 3: Mixed allocation, combining fixed and assured bandwidth. It is commonly used for AR (Assured Rate) services, which require guaranteed minimum bandwidth with flexibility for additional bandwidth.
Type 4: Best-effort allocation, suitable for non-critical services like web browsing.
Why B?
Type 3 is specifically designed for AR services, providing both guaranteed and flexible bandwidth allocation.
Thus, the correct answer is B.