4-Port POTS Telephone Over Ethernet Extender, LAN IP Converter with FXO and FXS, 4-in-1 Device for Phone to Ethernet, Phone to Fiber, RJ-45 Twisted Pair, Active Fiber Optic Voice Connection

4 different applications with the same device: Use it as: Phone (or fax) over Ethernet / IP / LAN converter, or with an optional 100FX SFP installed into the FX port over dark fiber or active fiber network, or simply connect LAN1 or LAN2 ports by RJ-45 cable. (Do Not Use Internet connection as an Uplink!)
Web Management Feature: Units will come with pre-configured IP addresses, but you can set a new subnet or fine-tune other settings using the web manager.
Comes as Pair: FXO side connects to CO side i.e. PABX, FXS side connect to CPE side, i.e. phone sets, or fax.
High transmit efficiency, low transmit delay, supports Ethernet packet out-of-order recovery, and cache to anti-network delay.
Adjustable frame length to balance bandwidth and transmission delay. Support power failure or automatic network recovery.