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COMSPHERE 3900 Series Modems
GL-8 November 1996 3910-A2-GN32-30
NMS
Network Management System. A set of diagnostic and
configuration management tools for a data communication
network, consisting of software programs and dedicated computer
hardware.
off-hook
A telephone or modem is being used.
on-hook
A telephone or modem is not being used.
Originate mode The modem is in a state where it is ready to transmit a call. In a
dial network, it is the modem that makes the call. In a leased-line
network, it is one of two sides of the network that is selected to be
the originating modem.
parity A way of checking data accuracy by counting the number of bits
that have a value of one.
PBX Telephone switching equipment (Private Branch Exchange)
dedicated to one customer
. A PBX connects private telephones to
each other and to the public dial network.
permissive interface A dial modem operating mode characterized by a fixed output
power level of –9 dBm.
phase jitter A rapid or repeated shifting of the relative phase of a signal
resulting in unwanted distortion.
physical address The diagnostic address of a control modem derived from its
location in the carrier: its carrier and slot number.
point-to-point line A line or circuit connecting two stations.
poll list
A list containing the network management addresses of
downstream modems.
power-up self-test
A test that checks most hardware components when the modem is
powered-on.
product code A three-digit code indicating the modem’
s highest VF data rate.
protocol The rules for timing, format, error control, and flow control during
data transmission.
PSTN Public Switched Telephone Network. A network shared among
many users who can use telephones to establish connections
between two points. Also known as dial network.
Quick Configuration
display
An informative display screen available from the modem’s
Top-Level display. It provides such information as network
position (control or tributary), network management address, DTE
mode (Asynchronous or Synchronous), Line mode (Leased
Answer, Leased Originate, or Dial), and the modulation scheme
used by the modem.