Category 1
Category 2
Category 3
Category 4
Category 5
100

 VPN

virtual private network

100

IP

Internet Protocol

100

SOHO

small office, home office

100

PSU

power supply unit

100

PaaS

platform as a service

200

 POST

power-on self-test

200

 RFID

radio-frequency ID

200

TCP

Transmission Control Protocol

200

TLS 

Transport Layer Security

200

PRL

preferred roaming list

300

MIMO

multiple input multiple output

300

ATX

advanced technology extended

300

IMAP

Internet Message Access Protocol

300

NAT

network address translation

300

ESD

electrostatic discharge

400

RTC

real-time clock

400

SCSI

small computer systems interface

400

SNMP

Simple Network Management Protocol

400

SMTP

Simple Mail Transfer Protocol

400

TFT

thin film transistor

500

MMCs

Microsoft Management Consoles

500

 UAC

User Account Control

500

 WSL

Windows Subsystem for Linux

500

 SCADA

supervisory control and data acquisition

500

 RSSI

received signal strength indicator

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