For SONET ring switching, the 50ms switch time? (Choose two.)

A.
lncludes the detection time

B.
Applies to rings smaller than 1200km

C.
Applies to rings smaller than 1000km

D.
Includes up to 16 nodes

Explanation:
APS protection switching has always been known for its recovery speed. SONET defines a
maximum switch time of 50 milliseconds for a BLSR ring with no extra traffic and less than 1200
km of fiber. The specifications actually state 60 milliseconds, with 10 ms for discovery of the
problem and 50 ms to perform the switch, but most people refer to this as just 50 ms. The
maximum number of nodes on a BLSR is 16.