RCDD · Question #285
What is the MAXIMUM horizontal cable length permitted for centralized optical fiber cabling from the MDA within a data center?
The correct answer is C. 300 m (984 ft). ANSI/TIA-942 defines 300 m (984 ft) as the maximum horizontal cable length for centralized optical fiber cabling originating from the Main Distribution Area in a data center. This limit governs the hierarchical topology used to manage optical loss budgets across the facility.
Question
What is the MAXIMUM horizontal cable length permitted for centralized optical fiber cabling from the MDA within a data center?
Options
- A100 m (328 ft)
- B200 m (656 ft)
- C300 m (984 ft)
- D400 m (1312 ft)
- E500 m (1640 ft)
How the community answered
(27 responses)- A7% (2)
- B19% (5)
- C70% (19)
- D4% (1)
Why each option
ANSI/TIA-942 defines 300 m (984 ft) as the maximum horizontal cable length for centralized optical fiber cabling originating from the Main Distribution Area in a data center. This limit governs the hierarchical topology used to manage optical loss budgets across the facility.
100 m is the maximum horizontal distance for copper balanced twisted-pair cabling per TIA-568, not the limit for centralized optical fiber in a data center.
200 m is not a recognized maximum distance for this cabling segment under ANSI/TIA-942 and does not correspond to any defined fiber channel design parameter in that standard.
ANSI/TIA-942 explicitly sets 300 m (984 ft) as the maximum horizontal distance for centralized optical fiber cabling from the MDA. This value accounts for the optical loss budget of both multimode and single-mode fiber used in data center structured cabling. Exceeding this distance risks signal attenuation beyond the threshold that active equipment at the endpoints can compensate for.
400 m exceeds the ANSI/TIA-942 maximum of 300 m for centralized optical fiber from the MDA and would risk violating the optical loss budget for the link.
500 m far exceeds the ANSI/TIA-942 permitted maximum and would introduce unacceptable attenuation for most multimode and even many single-mode data center fiber applications.
Concept tested: ANSI/TIA-942 centralized fiber cabling maximum distance MDA
Source: https://tiaonline.org/what-we-do/standards/
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