BTI Interface Cards (BICs) are modules that hold pluggable transceivers. The transceivers are plugged into the BICs, which in turn are inserted into the UFMs. A BIC can be installed into a UFM3 or a UFM4.

There are different types of BICs depending on the pluggables required. By housing different BICs, a UFM can hold different combinations of 10-Gbps and 100-Gbps interfaces.