a. Calculate the SONET overhead_percentage in an OC-12c SONET frame. Define overhead_percentage like this: if a 200-byte frame
has 10-bytes of overhead, and 190-bytes usable for payload,then the overhead is (10B/200B) = .05 = 5%
b. Now assume the OC-12c SONET frame payload area is filled with ATM cells. Assume that the application sending ATM cells
sends 48-byte PDUs (i.e. the ATM-cell payload area is "exactly filled").
What is the overhead percentage in this situation (where both SONET overhead, and ATM cell-headers count as overhead)?
You may round to the nearest number of whole ATM cells that fit in an OC-12c payload region, if you like.
c. Similar to "b", but assume the application generates 49-byte PDUs, which must be divided across 2 ATM-cell payload regions.
Unused portion of ATM-cell payload counts as overhead (since it takes bandwidth, but does not carry application data).
What is the resulting overhead percentage?"