erbium (Er)

A soft, malleable, silvery rare-earth element used in various alloys. Erbium-doped fiber

amplifiers (EDFAs) are used extensively in long haul fiber optic transmission systems (FOTS). Erbium is number 68 in the Periodic Table of Elements. Erbium is named for the village of Ytterby, Sweden, where it was discovered. So were ytterbium, yttrium, and terbium. See also EDFA, FOTS, and Ytterby.

• service profile identification (SPID)
• service set identifier (SSID)
• service switching point (SSP)
• Sesame (Secure European System for Applications in a Multivendor Environment)
• session
• Session Description Protocol (SDP)
• Session Initiation Protocol (SIP)
• Session Initiation Protocol (SIP) for Instant Messaging and Presence Leveraging Extensions (SIMPLE)
• Session Layer
• set handler
• set-top box
• severely errored cell block ratio (SECBR)
• SFTP (Shielded Foil Twisted Pair)
• SGCP (Simple Gateway Control Protocol)
• SGML (Standard Generalized Markup Language)
• Shannon, Claude Elwood (1916–2001)
• Shannon, Claude Elwood (1916–2001)
• Shannon, Claude Elwood (1916–2001)
• Shannon’s Law
• shared bus switch
• Shared Registry System (SRS)
• SHDSL (Symmetric High-bit-rate Digital Subscriber Line)
• sheath
• SHF (Super High Frequency)
• shield