The model FN-4127-SLC Dual SLC Loop Expander is a two loop expander board that increases the standard FireNET loop capacity from 2 to 4 loops. The FN-4127-SLC can be added at the factory or installed in the field, and mounts within the main control board location as a piggy-back board. By adding the FN-4127-SLC, the FireNET capacity is increased from 254+254 to 508+508 analog addressable points within the overall 800 address/ sub-address limit. The FN-4127-SLC has the same functionality as the built-in SLC loops. The FN-4127- SLC utilizes Hochiki’s robust DCP loop protocol for highly reliable and fast alarm reporting without the need for shielded or twisted pair wiring for the SLC loops.