Cisco Cisco 6015 IP DSL Switch

EOC—embedded operations channel. 

ETSI—European Telecommunications Standards Institute. ETSI is a non-profit organization producing 
voluntary telecommunications standards used throughout Europe, some of which have been adopted by 
the EC as the technical base for Directives or Regulations.

frame—A packet as it is transmitted over a serial line. The term derives from character-oriented 
protocols that involved the addition of special start-of-frame and end-of-frame characters for packet 
transmission. 

FTP—File Transfer Protocol. The Internet protocol (and program) used to transfer files between hosts.

G.992.2—The ITU standard for line coding and framing for splitterless, reduced spectrum ADSL. Also 
known as G.lite.

G.994.1—The ITU standard for signaling, identification, and negotiation between broadband systems; 
an integral part of G.dmt and G.lite. Also known as G.hs.

G.997.1—The ITU standard for performance monitoring on DMT access technologies.

G.dmt—Pseudonym for G.992.1.

G.hs—Pseudonym for G.994.1 HandShake (hs).

G.lite—Pseudonym for G.992.2.

handshake—Part of the procedure to set up a data communications link. The handshake can be part of 
the protocol itself or an introductory process. The computers that are to talk to each other set out the 
conditions they can operate under. Sometimes, the handshake is just a warning that a communication 
is imminent. 

IETF—Internet Engineering Task Force. Task force consisting of over 80 working groups responsible 
for developing Internet standards.

IP—Internet Protocol. The network layer protocol for the Internet Protocol suite.

IP address—The 32-bit address assigned to hosts that want to participate in a TCP/IP Internet.

ISDN—Integrated Services Digital Network. Communication protocol offered by telephone companies 
that permits telephone networks to carry data, voice, and other source traffic. 

ITU—International Telecommunications Union; a telecommunications standards body.

LCD—loss of cell delineation.

LODS—loss of delay synchronization.

LOF—loss of frame.

loopback—A diagnostic test that returns the transmitted signal to the sending device after it has passed 
through a network or across a particular link. The returned signal can be compared to the transmitted 
signal and any discrepancies can be used to trace the fault. When trying to locate a faulty piece of 
equipment, you can repeat loopbacks, eliminating satisfactory equipment, until the problem is found. 

LOS—loss of signal.

LPR—loss of power.

Management Information Base—See MIB.

MIB—Management Information Base. A collection of objects that can be accessed through a network 
management protocol, such as SNMP or CMIP (Common Management Information Protocol).

NI-2—A second generation network interface card.

PVC—permanent virtual connection. A fixed virtual connection between two users. The public data 
network equivalent of a leased line. The creation of a PVC requires no call setup or clearing procedures.

QAM—Quadrature Amplitude Modulation.