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Appendix : Glossary 133
ESD Electrostatic Discharge—Discharge of stored static electricity that can damage
electronic equipment and impair electrical circuitry, resulting in complete or
intermittent failures.
ESF Extended Super Frame—Framing type used on T1 circuits that consists of 24
frames of 192 bits each, with the 193rd bit providing timing and other functions.
ESF is an enhanced version of super frame (SF).
ESIG Extended Signaling—A system internal to Total Control which ingresses and
distributes SS7 signaling throughout the Chassis via the packet bus.
ETSI European Telecommunications Standards Institute—Similar to the ANSI in the
United States. It’s purpose is to provide standards for the telecommunications
industry.
FCC Federal Communications Commission—A United States federal regulatory agency
which oversees all aspects of the communications industry, TV, radio, telephone
etc. in the United States.
FTP File Transfer Protocol—Application protocol, part of the TCP/IP protocol stack, for
transferring files between network nodes. FTP is defined in RFC 959.
GCF Gatekeeper Confirm—This is a call flow message.
GK Gatekeeper—A device that manages an IP network, supporting all gateways, user
profiles, and authentication. A gatekeeper is defined by the H.323 standard.
GRJ Gatekeeper Reject—This is a call flow message.
GRQ Gatekeeper Request—This is a call flow message.
GSM Global System for Mobile Communications—The European standard for digital
cellular service using slow frequency-hopping and TDMA.
GW VoIP Media Gateway—A CommWorks VoIP device that can interconnect networks
with different, incompatible communications protocols. The gateway performs a
layer-7 protocol-conversion to translate one set of protocols to another (for
example, from TCP/IP to SNA or from TCP/IP to X.25). A gateway operates at OSI
layers up through the Session Layer.
GUI Graphical User Interface—A software interface based on pictorial representations
and menus of operations, commands, and files. Opposite of the operating system
command line interface.
HDB3 High Density Bipolar Three Zeros—A bipolar coding method that does not allow
more than three consecutive zeros in the line signaling.
HDM High Density Modem—The HiPer DSP card in the VoIP system. It implements the
PSTN interface and CODEC functions of the VoIP system. It contains 24 channels
per card (T1-PRI) or 31 (E1-PRI) channels per card.
IC Industry Canada—A department of the Canadian government. It serves to
promote all aspects of Canada’s economy. It’s charter is to improve conditions for
investment, improve innovation performance, increase Canada's share of global
trade and build a fair, efficient and competitive marketplace.