Digi X2 - Manual (Page 233)

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modem emulation
A serial port configuration where the port acts as a modem. The Digi device emulates
modem responses to a serial device and seamlessly sends and receives data over an
Ethernet network instead of a Public Switched Telephone Network (PSTN). The
advantage for a user is the ability to retain legacy software applications without
modification and use a less expensive Ethernet network in place of public telephone
lines. Also known as pseudo-modem or pmodem.
NAT
NAT (Network Address Translation) is the translation of an Internet Protocol address
(IP address) used within one network to a different IP address known within another
network through a NAT table that does the global-to-local and local-to-global IP
address mapping. This increases security since each outgoing or incoming request must
go through a translation process that also authenticates the request or matches it to a
previous request. NAT can be statically defined or it can be set up to dynamically
translate from and to a pool of IP addresses. NAT also conserves on the number of
global IP addresses needed and it uses a single IP address in its communication with the
world.
Personal Area Network (PAN)
In Mesh/ZigBee networks, a PAN is a data communication network that includes a
Coordinator and one or more routers/end devices. Network formation is governed by
Network Maximum Depth, Maximum Child Routers and Maximum Children End
Devices.
port forwarding
A serial port configuration that sends data directly to a specific port instead of the path
determined by the router based on traffic.
POST
See Power-On Self Test.
Power-On Self Test (POST)
When power is turned on, POST (Power-On Self-Test) is the diagnostic testing
sequence that a computer's basic input/output system (or “starting program”) runs to
determine if the computer keyboard, random access memory, disk drives, and other
hardware are working correctly.
If the necessary hardware is detected and found to be operating properly, the computer
begins to boot. If the hardware is not detected or is found not to be operating properly,