Hi

Tranceiver is a general term which tells that the device has the capacity of both transmitting and recieving.

Mostly being referred in wireless and satellite comm devices .

AFAIK with ref to cisco its being used in the optical technology too wherein u got the tranceiver modules being deployed in all kinda optical fiber connectivity.

This link talks more inline with the cisco modules ..

http://www.cisco.com/en/US/products/hw/modules/ps5455/prod_module_series_home.html

AFAIK transmode is something related to transmit mode or related to the config setting whichs done in the devices/equipments.not fully sure about that ..

regds