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FTTH & Fibre Optics · 3 min read
By the ECA Networks technical desk · Last updated 21 September 2026
The cable is rarely the expensive part of a campus backbone. Civil work, access and downtime usually cost more than the fibre itself.
Short answer
Use single mode for links leaving a building or likely to be upgraded. Keep multimode for short, fixed internal links where compatible optics already exist.
Single mode supports long distances and future speed changes without replacing the buried cable. Current optics have narrowed the old price gap.
Multimode remains practical inside one building when distances are short and the installed switches already use matching transceivers.
Not on the same fibre run. Different buildings can use different types, but a single mode transceiver cannot talk to a multimode one across the same strand.
The cable itself is close in price now. The bigger cost difference is on the optics, and even that gap has narrowed as single mode SFPs have become commodity items.
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FTTH & Fibre Optics
FTTH & Fibre Optics
FTTH & Fibre Optics
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