IBM 300 Service Manual page 150

FRTE. Frame-relay terminal equipment.
FRU. Field replaceable unit.
FT1. Fractional T1.
FTP. File transfer protocol.
Gbps. Gigabit per second (10 to the power of 9 bits
per second).
GCRA. Generic cell rate algorithm.
GFP. Generic function protocol.
GFT. Generic function transport.
GSM. Group special mobile.
GUI. Graphical user interface.
HDB3. High-density bipolar 3.
HDLC. High-level data link control.
high-level data link control (HDLC). A data network
protocol.
hot pluggable. Refers to a hardware component that
can be installed or removed without disturbing the
operation of any other resource that is not connected to,
or dependent, on this component.
HPFS. High-performance file system.
HPRI. High priority.
HSAn. High-speed adapter type n (module).
HSDS. High-speed digital services.
HSSI. High-speed serial interface.
hub (intelligent). A wiring concentrator, such as the
IBM 8260, that supplies bridging and routing functions
for LANs with different cables and protocols.
hunt group. See X.25 hunt group.
IDNX. Integrated Digital Network Exchange.
IE. Information element.
ILMI. Interim local management interface.
IMU. Inverse multiplexing unit
Integrated Digital Network Exchange (IDNX). A
processor integrating voice, data, and image
applications. It also manages transmission resources
and connects to multiplexers and network management
support systems. It permits integration of equipment
from different vendors.
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2220 Setup and Service Guide
integrated services digital network (ISDN). A digital
end-to-end public or private network that supports
multiple services including, but not limited to, voice and
data.
IP. Internet Protocol.
IP gateway adapter. In an Nways Switch, a port
adapter that routes the IP control between the NAS and
the network management station.
ISDN. Integrated services digital network.
ISDN network interface. A logical resource generated
by the Nways Switch Control Program to provide access
services to a physical ISDN or QSIG port line. An ISDN
network interface sets up and maintains connections
between calling ISDN terminal equipments and called
terminal equipments attached through other Nways
Switches.
ISO. International Organization for Standardization.
isochronous. Refers to transmission at a constant bit
rate where there is a clock relationship between source
and destination. The bit rates are the same on the
destination and source.
ITU-T. International Telecommunication Union -
Telecommunication (replaces CCITT).
jitter. Undesirable variations in the transmission delay
of a digital signal. Also called cell delay variation (CDV).
KB. Kilobyte (storage capacity, 1024 bytes).
kbps. Kilobit per second (1000 bits per second).
LAN. Local area network.
LAPB. Link access procedure for B-channel.
LAPD. Link access procedure for D-channel.
LCB. Line connection box.
LCBB. Line connection box, base (LCEB and LCPB).
LCBE. Line connection box, expansion (LCEE and
LCPE).
LCEB. Line connection enclosure, base.
LCEE. Line connection enclosure, expansion.
LCPB. Line connection power, base.
LCPE. Line connection power, expansion.
LCR. Least cost routing.
LED. Light-emitting diode.
LICn. Line interface coupler type n (module).