Calculate the ELFEXT in Db, given an Attenuation of 3.46 dB and a FEXT of 3.90 dB

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

1. Calculate the ELFEXT in Db, given an Attenuation of 3.46 dB and a FEXT of 3.90 dB

2. In the following diagram, you can see a problem located at 21,3 m far from the main unit.

The problem is:

Select one:

a) Wire is open (cut)

b) This is evidence of a split pair

c) A fraction of the signal is returning to the main unit overr the other wire on the same pair

d) Some energy is being transferred to some other pair, due to NEXT

e) NEXT is too high at that point

f) A small percentage (%) of the signal is being reflected back to the main unit

3. In the following diagram there is a problem at 35,8 m from the main unit:

The problem is:

Select one:

a) Insertion loss is too high

b) pairs 1-2 & 3-6 open (end of the cable, or the cable is cut)

c) pairs 1-2 & 3-6 in short circuit, positive (+) and negative (-) wires are in direct contact

d) Some energy is from pair 1-2 to 3-6 (or vice-versa) probably at high frequency

e) Return loss is too high

f) Pairs 1-2 & 3-6 are in short circuit each other

4. There is a wiring anomaly in the following diagram:

So the pair 12 is:

a) a split pair

b) a crossover pair

c) an untwisted pair

d) an inverted pair

a) The cable is stored forming loops at those positions.

 

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