How to distinguish between single-fiber transceiver and dual-fiber transceiver

There are currently two ways to distinguish between single-fiber transceivers and dual-fiber transceivers.

The first mean: when the optical transceiver is embedded in the optical transceiver, the optical transceiver is divided into a single-fiber transceiver and a dual-fiber transceiver according to the number of cores of the connected optical fiber jumpers. The fiber-optic jumper connected to the single-fiber transceiver (right) is linear with one core, which is responsible for transmitting data and receiving data; and the fiber-optic jumper connected to the dual-fiber transceiver (left) Linear is two cores, one of which is responsible for transmitting data and the other is responsible for receiving data.

The second mean: when the optical transceiver does not have an embedded optical module, it needs to distinguish whether it is a single-fiber transceiver or a dual-fiber transceiver according to the inserted optical module. When a single-fiber bidirectional optical module is inserted into the optical transceiver, that is, the interface is a simplex type, the optical transceiver is a single-fiber transceiver (right); when the optical transceiver is inserted into a dual-fiber bidirectional optical module, When the interface is duplex, this transceiver is a dual-fiber transceiver (left).