The FMUX1001-FXO is a 4 port POTS FXO type telephone line module, hot swappable, for the FMUX1001 fiber multiplexer. The FXO module is designed to accept telephone lines coming from telcos/phone companies or PBS extensions. There are a total of 4 slots for data modules on the main FMUX1001 chassis. Other modules available for the FMUX1001 support T1, E1, RS232, RS530, X.21, V.35 and FXS type POTS interfaces. The FMUX1001 chassis has built-in redundant Gigabit speed SFP optics and has SNMP and full speed Gigabit Ethernet network connectiuons offered besides the total 16 channels available.