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RCDD · Question #31

In a run requiring 15 m (50 ft) of cable between the floor distributor and the consolidation point, the MAXIMUM length of cable allowed between the CP and the telecommunications outlet is:

The correct answer is D. 75 m (242 ft). This question tests the ability to calculate the maximum CP-to-outlet cable length given a known floor distributor-to-CP distance, applying the ANSI/TIA-568 90m horizontal channel limit.

Information Transport Systems (ITS) Distribution

Question

In a run requiring 15 m (50 ft) of cable between the floor distributor and the consolidation point, the MAXIMUM length of cable allowed between the CP and the telecommunications outlet is:

Options

  • A27.4 m (90 ft)
  • B36.5 m (120 ft)
  • C45.8 m (150 ft)
  • D75 m (242 ft)
  • E90 m (295 ft)

How the community answered

(15 responses)
  • A
    13% (2)
  • B
    7% (1)
  • C
    7% (1)
  • D
    73% (11)

Why each option

This question tests the ability to calculate the maximum CP-to-outlet cable length given a known floor distributor-to-CP distance, applying the ANSI/TIA-568 90m horizontal channel limit.

A27.4 m (90 ft)

27.4m (90 ft) is far below the correct remainder and does not result from applying the 90m total channel minus the 15m FD-to-CP segment.

B36.5 m (120 ft)

36.5m (120 ft) is incorrect; subtracting 15m from 90m yields 75m, not 36.5m.

C45.8 m (150 ft)

45.8m (150 ft) is incorrect and would only be valid if the total horizontal channel limit were approximately 60.8m, which is not the standard.

D75 m (242 ft)Correct

ANSI/TIA-568 limits the total horizontal cable run from the floor distributor to the telecommunications outlet to a maximum of 90m (295 ft). With 15m (50 ft) already consumed between the floor distributor and the CP, the remaining allowable length from the CP to the outlet is 90m - 15m = 75m, which corresponds to approximately 242-246 ft depending on rounding, making option D the correct answer.

E90 m (295 ft)

90m (295 ft) is the total horizontal channel limit, not the CP-to-outlet segment; selecting this ignores the 15m already used between the floor distributor and the CP.

Concept tested: Horizontal cabling channel length calculation with consolidation point

Source: https://tiaonline.org/what-we-do/standards/tia-568/

Topics

#consolidation points#horizontal cable length#cable distance calculation#floor distributor

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