Cause why some boards need to use G.657A2 fibers

A G.657A2 fiber uses a short jacket. Some boards have small optical port slopes (that is, egress optical ports are flat). G.657A2 fibers are used on these boards so that the fibers are not squeezed by cabinet doors. The fiber type is not limited if no cabinet door is used or fibers will not be squeezed by doors of third-party cabinets.

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