Specifications

Gateway
Gateways are points of entrance and exit from a communications
network. Viewed as a physical entity, a gateway is that node that
translates between two otherwise incompatible networks or
network segments. Gateways perform code and protocol
conversion to facilitate traffic between data highways of differing
architecture.
Impedance
The combined effect of resistance, inductance and capacitance on
a transmitted signal. Impedance varies at different frequencies.
Interface
A shared boundary, defined by common physical interconnection
characteristics, signal characteristics, and meanings of exchanged
signals.
IP Address
Also known as an Internet address. A unique string of numbers
that identifies a computer or device on a TCP/IP network. The
format of an IP address is a 32-bit numeric address written as four
numbers from 0 to 255, separated by periods (for example,
1.0.255.123).
Jitter
The deviation of a transmission signal in time or phase. It can
introduce errors and loss of synchronization in high speed
synchronous communications.
Laser
A device that transmits an extremely narrow and coherent beam
of electromagnetic energy in the visible light spectrum. Used as a
light source for fiber optic transmission (generally more expensive,
shorter lived, single mode only, for greater distances than LED).
Loading
The addition of inductance to a line in order to minimize amplitude
distortion. Used commonly on public telephone lines to improve
voice quality, it can make the lines impassable to high speed data,
and baseband modems.
Loopback
A type of diagnostic test in which the transmitted signal is
returned to the sending device after passing through all or part of
a communications link or network.
Manager
An application that receives Simple Network Management Protocol
(SNMP) information from an agent. An agent and manager share a
database of information, called the Management Information Base
(MIB). An agent can use a message called a traps-PDU to send
unsolicited information to the manager. A manager that uses the
RADview MIB can query the RAD device, set parameters, sound
alarms when certain conditions appear, and perform other
administrative tasks.
Mark
In telecommunications, this means the presence of a signal. A
mark is equivalent to a binary 1. A mark is the opposite of a space
(0).
Master Clock
The source of timing signals (or the signals themselves) that all
network stations use for synchronization.