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Term Definition
FirewallIs a dedicated appliance, or software running on another computer, which inspects network traffic passing through it, and denies or permits passage based on a set of rules.
 
FXOFXO - Foreign eXchange Office interface is the port that receives the analog line. It is the plug on the phone or fax machine, or the plug(s) on your analog phone system. It delivers an on-hook/off-hook indication (loop closure). Since the FXO port is attached to a device, such as a fax or phone, the device is often called the FXO device.
 
FXSFXS - Foreign eXchange Subscriber interface is the port that actually delivers the analog line to the subscriber. In other words it is the plug on the wall that delivers a dialtone, battery current and ring voltage.
 


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