E-1

E-1 bit rate, plus some overhead for error control. At such a high frequency, issues of attenuation are significant and mutual interference between cable pairs must be considered, so repeaters must be placed every 6,000 feet. Contemporary E-1 circuits typically are provisioned using high-bit-rate digital subscriber line (HDSL) technology, which mitigates these issues.

E-1 is considered medium independent and will run over coaxial cable, optical fiber, microwave, satellite, and free space optics (FSO), as well as twisted pair. E-1 generally is used in local loops and other short haul applications. In long haul applications, E-3 and other, higher speed, standards generally are employed.

See also AMI, attenuation, carrier, CSU, DS-0, DSU, E-3, E-carrier, FDX, four wire, frame, framing bit, frequency, FSO, HDSL, line coding, payload, signaling rate, simplex, synchronization, TDM, time slot, transmission rate, two-wire circuit, and UTP.

• 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
• shielded foil twisted pair (SFTP)
• shielded twisted pair (STP)