CORNING PS-AU-AIR, Руководство по программированию для пользователя

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Corning Optical Communications
User Manual | Page 44
Optical Indicator
Each pair (2) of optical module cages has four LED indicator arrows. The two on the left are green, and the two on the right are red as
shown in Figure below. The indicator arrows represent the synchronization status of the upper and lower optical modules. When a pair
of optical modules are synchronized (both uplink and downlink), the indicators turn green as shown in the right pair of indicators in
Figure below. When the optical module is unplugged or not synchronized, the indicators are red as shown in the left pair of indicators.
Check whether both indicators turn green after connecting one pair of optical modules. If the indicators are red, the terminal has not
synchronized.