Installation manual

Glossary
Glossary-53000-A2-GA31-F0 March 2001
EIA-530-A An EIA standard for a high-speed, 25-position, DCE/DTE interface.
extended network The extension of a circuit where the tributary DCE is connected to a downstream (extended)
control DCE.
FA Facility Alarm. A failure condition reported to the NMS when there is a break in
communication with one or more tributary.
FCC Federal Communications Commission. Board of Commissioners that regulates all U.S.
interstate, intrastate, and foreign electrical communication systems that originate from the
United States.
FEP Front-End Processor. A communications computer associated with a host computer that
manages the lines and routing of data through the network.
FGRD Frame ground.
ferrite choke A ferrite choke is attached to a cable on the COMSPHERE 3000 Series Carrier to reduce
electromagnetic interference and ensure compliance with FCC Part 15 Rules.
filler panel Prevents accidental contact with the COMSPHERE 3000 Series Carrier backplane. Installed
in all carrier slots that do not have a circuit card installed.
flex The flex option is available for TDM or MCMP. When installed, each port can be set
independently as either an EIA-232 or V.35 interface.
FPE Front Panel Emulation. FPE diskette is used with an external PC connected to a T1 CSU or
T1 DSU/CSU.
framing A control procedure used with multiplexed digital channels where bits are inserted so the
receiver can identify time slots allocated to each sub channel.
full-duplex The capability to transmit in two directions simultaneously.
Hz Hertz. A unit of frequency that equals one cycle per second.
IEC InterExchange Carrier. A company that provides inter-LATA (local exchange carrier)
telecommunications services, like AT&T, MCI, and US SPRINT. Access to these services
can be provided through DDS dedicated channels, T1.5 dedicated access channels, or digital
switched access (DSA) channels.
IOC ISDN Ordering Code.
ISDN Integrated Services Digital Network. Provides capability to carry voice and data while
sending signaling on the D-channel.
ITU-TSS International Telecommunications Union Telecommunications Standardization Sector. An
advisory committee established by the United Nations to recommend communications
standards and policies and allocate transmission frequencies. Before March, 1993, it was
called CCITT.
JM8 A jack used for leased-line networks. Pins 1 and 2 are the transmit pair and Pins 7 and 8 are
the receive pair.
kbps Kilobits per second (thousand bits per second).
LADS Local Area Data Set is used to provide a point-to-point link between two devices (also
called LDM).