Otical?

At present, optical transceiver is used? Is connected withthe optical transmission system (usually SDH synchronousdigital transmi ssion network) ,The other end(user side) comes out of the 2M interface. In addition PDH and PDH (synchronous digital series).Optical machine is more complex than fiber optitransceivers, in addition to the photoelectric coupl ing andmultiplexing - demultiplexing, mapping - signal encodingprocess mapping solut ion.