Clear-Com HLI-FBS - Manual (Page 19)

Interface module Description
Fiber interface module
(HLI-FBS) Enables linking of Main Stations, and connection of Remote
Stations and Speaker Stations via a fiber link. Contains two SFP
cage slots. The module is supplied with one transceiver fitted.
Any 100BASE-X SFP can be connected.
Warning: Both ports are configured to bridge traffic
from one port to the other in order to work in a daisy-
chained configuration. Spanning Tree Protocol is not
enabled on these ports, therefore do not connect
them both to the same network.
Table 2-16: HMS-4X Main Station rear panel: Interface Modules
19 HelixNet Partyline User Guide