A terminal server by any other name • A terminal server (sometimes called a serial server or a console server or a device server) is a hardware device that enables you to connect serial devices across a network. • Terminal servers acquired the...

Surge vs. lightning protection. • Surge vs. lightning protection • A brief rise in voltage • A surge is a brief rise in voltage that's caused when power is switched on or off to a high-powered device. Surges can produce high-transient voltages...

...11801:2002) specifies a frequency range of 1–600 MHz over 100 meters of fully shielded twisted-pair cabling. It encompasses four individually shielded pairs inside an overall shield, called Shielded/Foiled Twisted Pair (S/FTP) or Foiled/Foile...

...industrial devices that provide a hardware interface for DIO signals. • Hobbyists • Because DIO devices are extremely versatile and can often be controlled from home computers, they find many uses in hobbies such as model railroading and robotics.

...to networks in office environments, Ethernet has also proven to be a robust alternative to the RS-232 interfaces traditionally used with industrial devices such as programmable logic controllers. Ethernet brings speed, versatility, and cost s...

Five key elements of effective network security. • Identity • Accurate and positive identification of network users, hosts, applications, services, and resources is a must. Kerberos, password tools, and protocols such as RADIUS and TACACS+ ena...

...Ethernet (PoE) was ratified by the Institute of Electrical and Electronic Engineers (IEEE) in June 2000 as the 802.3af-2003 standard. It defines the specifications for low-level power delivery—roughly 13 watts at 48 VDC—over twisted-pair Ethernet c...