Digicom 3911 Nonlinear distortion, Off-hook, Offline, On-hook, Online, Originate mode, Parity

COMSPHERE 3900 Series Modems

NIM	Network Interface Module. The interface provided for the public switched telephone network
	(PSTN). There are two NIMs per carrier.
NMS	Network Management System. A computer system used for monitoring and controlling network
	devices.
nonlinear distortion	VF line distortion which is usually associated with pulse-code modulation (PCM) compandor
	noise on the phone line.
off-hook	The state of a telephone or modem that is connected to the network.
offline	The state of a modem that is not connected to another modem.
on-hook	The state of a telephone or modem that is not connected to the network.
online	The state of a modem that is connected to and communicating with another modem.
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	Private Branch Exchange. Telephone switching equipment 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. It is one of
	two possible modes of operation for modems connected to dial lines (see programmable
	interface).
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 device 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.
POTS	Plain Old Telephone Service. Standard telephone service over the PSTN, with an analog
	bandwidth of less than 4 KHz.
power-up self-test	A test that checks most hardware components when power is applied to the device or a reset is
	initiated.
protocol	A set of rules that determines the behavior of devices in achieving and maintaining
	communication.
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	An informative display screen available from the modem’s Top-Level display. It provides such
display	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.
register	A part of the device’s memory that holds stored values.
remote	Files, devices, and users not attached to your local DTE.
remote loopback	A test that sends a signal to the remote modem to test the local modem, the remote modem, and
	the circuit between them.
result code	An asynchronous message (in either numbers or words) that the device sends to the DTE after
	executing or trying to execute a command.

Glossary-6 September 1998 3910-A2-GN32-40