Description The BLN and BCN support a full line of FRE link modules, providing connectivity for 100BASE-T, Ethernet, Token Ring, FDDI, MCT1/E1, and serial interfaces. Compatibility of FRE link modules across Bay Networks router products, including the FN, LN, and CN, ensures maximum flexibility and makes sparing efficient and cost-effective. FRE link modules are easy to install and configure.