Exercises 6 through 9 are based on the above situation.
How many TS-2669/GCM's will you need to perform this test?
One set is needed since the wire is looped back at station B.
Two sets are required, because the set at station B is receiving
while the set at station A is sending.
Three sets are needed, because a second set at station B is
needed to return the delayed signal.
Four sets must be used, one set for
transmitting at each end of the circuit.