Allied Telesis AT-GS924GB - Manual (Page 41)

AT-GS924GB Gigabit Ethernet Switch Installation Guide
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Use a fiber optic tester to test the attenuation on the cable to
determine if the strength of the fiber optic signal falls below
acceptable limits.
Check that the operating specifications (for instance, wavelength
and maximum operating distance) of the fiber optic port on the
remote end-node are compatible with the fiber optic port on the
switch. For example, you cannot connect a fiber optic port with a
maximum distance of 40 kilometers (24.8 miles) and an operating
wavelength of 1550 nm to a remote fiber optic port with an
maximum distance of only 2 kilometers (1.24 miles) and a
wavelength of 1310 nm.
Ensure that the fiber optic ports on the switch and on the end-
node are operating at the same speed and duplex mode.
Note
A 1000Base connection can take from five to ten seconds for the
link to be established.