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Glossary
M40 Internet Router Hardware Guide
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DSU
Data service unit. A device used to connect a DTE to a digital phone line. Converts digital data
from a router to voltages and encoding required by the phone line. See also CSU/DSU.
from a router to voltages and encoding required by the phone line. See also CSU/DSU.
DTE
Data Terminal Equipment. RS-232-C interface that a computer uses to exchange information
with a serial device.
with a serial device.
DVMRP
Distance Vector Multicast Routing Protocol. Distributed multicast routing protocol that
dynamically generates IP multicast delivery trees using a technique called reverse path
multicasting (RPM) to forward multicast traffic to downstream interfaces.
dynamically generates IP multicast delivery trees using a technique called reverse path
multicasting (RPM) to forward multicast traffic to downstream interfaces.
DWDM
Dense wavelength-division multiplexing. Technology that enables data from different sources
to be carried together on an optical fiber, with each signal carried on its own separate
wavelength.
to be carried together on an optical fiber, with each signal carried on its own separate
wavelength.
Dynamic Host
Configuration Protocol
See DHCP.
E
ECSA
Exchange Carriers Standards Association. A standards organization created after the
divestiture of the Bell System to represent the interests of interexchange carriers.
divestiture of the Bell System to represent the interests of interexchange carriers.
EGP
Exterior gateway protocol, such as BGP.
EIA
Electronic Industries Association. A United States trade group that represents manufacturers
of electronics devices and sets standards and specifications.
of electronics devices and sets standards and specifications.
EMI
Electromagnetic interference. Any electromagnetic disturbance that interrupts, obstructs, or
otherwise degrades or limits the effective performance of electronics or electrical equipment.
otherwise degrades or limits the effective performance of electronics or electrical equipment.
explicit path
See signaled path.
export
To place routes from the routing table into a routing protocol.
F
FEAC
Far-end alarm and control. T3 signal used to send alarm or status information from the
far-end terminal back to the near-end terminal and to initiate T3 loopbacks at the far-end
terminal from the near-end terminal.
far-end terminal back to the near-end terminal and to initiate T3 loopbacks at the far-end
terminal from the near-end terminal.
Flexible PIC
Concentrator
See FPC.
forwarding information
base
See forwarding table.
forwarding table
JUNOS software forwarding information base (FIB). The JUNOS routing protocol process
installs active routes from its routing tables into the Routing Engine forwarding table. The
kernel copies this forwarding table into the Packet Forwarding Engine, which is responsible
for determining which interface transmits the packets.
installs active routes from its routing tables into the Routing Engine forwarding table. The
kernel copies this forwarding table into the Packet Forwarding Engine, which is responsible
for determining which interface transmits the packets.
FPC
Flexible PIC Concentrator. An interface concentrator on which PICs are mounted. An FPC
inserts into a slot in a Juniper Networks router. See also PIC.
inserts into a slot in a Juniper Networks router. See also PIC.
FRU
Field-replaceable unit. Router component that customers can replace onsite.