User's Manual

70 APCD–NC006–A
Table 10 NCL1170 Network Terminology
Term Definition
Address Resolution
Protocol (ARP)
The layer below the IP layer; maps the IP and MAC addresses
together.
Bridge A device that connects and passes packets between two
network segments. A bridge operates at the MAC layer. A
bridge filters or forwards an incoming frame based on the MAC
address of the frame.
A learning bridge listens to traffic on its interfaces and
maintains a table of addresses. See also Router.
Channel Generally, the medium through which information is
communicated. In wireless communications, the channel is
usually defined by the center frequency, modulation type, and
occupied bandwidth.
Command Line Interface
(CLI)
In contrast to a graphical user interface, a CLI is a
configuration and control interface based on keyboard-entry
commands and responses.
Console Port Typically, the 9-pin RS 232 serial port on an NCL1170 to which
a terminal or laptop computer is connected to configure or
control the device.
Domain Name Server
(DNS)
A database system that translates IP addresses into domain
names. For example, 207.23.187.242 is converted into
waverider.com.
Direct-Sequence Spread
Spectrum (DSSS)
A form of spread-spectrum communications that uses a high-
speed code sequence, along with the information being sent,
to modulate the RF carrier.
Master The NCL1170 defined as a master provides the access control
for all NCL1170 stations in the same radio network. The
master configuration determines the channel that the NCL1170
stations use. There must be only one master using the same
channel in the radio network. You must configure a master
within the coverage area of another master to use a different
channel.
Master ID Improves security on the wireless network. NCL1170s must
have the same master ID in order to communicate with each
other.
Master vs. Station Decide which NCL1170 is the master. In the point-to-point
configurations, it does not matter which NCL1170 is master,
just remember that the master provides the access control to
the station. In the case of point-to-multipoint, the master must
have a line of sight to each station, but each station may not
have a radio communication path to other stations.