An interlink tranceiver was, according to Jean-Luc Picard, a part of a Borg drone's interlink system that used phased pulse technology. One of its key systems was phase modulation circuitry.
In 2370, Geordi La Forge and Picard used this circuitry to adapt a stolen transceiver into a Kedion pulse generator, with which they were subsequently able to reboot some of Data's ethical subroutines, and thereby break Lore's hold on his brother. (TNG: "Descent, Part II")