PLANET EM-MII series_v7.0.pdf - Manual (Page 19)

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SFP Model
Physical
Fiber Cable Length “n” km
MTB-LA20
MTB-LB20
MTB-LA40
MTB-LB40
MTB-LA60
MTB-LB60
10 < n < 20 2 dB 4-6 dB 8-10 dB
20 < n < 40 -- 2-4 dB 6-8 dB
40 < n < 60 -- -- 2-4 dB