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.
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)- A13% (2)
- B7% (1)
- C7% (1)
- D73% (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.
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.
36.5m (120 ft) is incorrect; subtracting 15m from 90m yields 75m, not 36.5m.
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.
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.
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
Community Discussion
No community discussion yet for this question.