Paradyne 3615, 3616 manual Dsr

COMSPHERE DualFlow Data Service Units

CTS	The state of the Clear-to-Send lead (V.24 circuit 106).
Data Service Unit	A DCE device that interprets, interfaces, and provides timing and signal control
(DSU)	between a DTE device and a digital network.
Data Terminal Equipment	A computer or peripheral device, such as a terminal or printer; a data source or sink.
(DTE)
DBM	The dial backup module for the DualFlow DSU. This module provides an alternate
	data path for carrying router data. Three types of DBMs are available: V.32 DBMs
	(14.4 kbps) for backup through the PSTN (dial network), 4-wire Switched 56
	DBMs for backup through the 4-wire Switched 56 kbps digital service, and 2-wire
	Switched 56 DBMs for backup through the 2-wire Switched 56 kbps digital service.
	(The 4-wire Switched 56 DBMs are only available in the U.S.)
DDS	Digital Data Service, such as ACCUNET Spectrum of Digital Services, that
	provides digital (not dial) communication circuits.
dedicated backup	A dial backup module (DBM) assigned to a particular DSU that is continually
	available for service restoral. The DBM switches to Dial Backup mode
	automatically if the router detects data errors; no switching is required.
Diagnostic Control Panel	The face of the Model 3615 DualFlow DSU that continuously provides status
(DCP)	information about the DSU's operation and allows an operator to manage its
	operation. This is a generic term used for both the standalone and carrier-mounted
	DSU models. See shared diagnostic control panel (SDCP) for the Model 3615
	DualFlow DSU.
dial string	A sequence of up to 36 characters that the DBM can send into the dial network to
	establish a call to a remote backup device. It consists of a telephone number and
	may include other information, such as a callback directory pointer.
DIP switch	Dual In-line Package switch.
Direct Distance Dialing	Telephone exchange service, the Public Switched Telephone Network (PSTN or
(DDD)	dial network) that enables a telephone service user to access telephone lines without
	operator assistance.
DMI	Data Mode Idle. Refers to a sequence of 1s transmitted or received on the DDS or
	Switched 56 kbps network. When the DSU Port and DBM Port branch
	configuration option RTS Cntrl is set to FrcOn, the DSU will transmit DMI
	whenever RTS is Off. Data Mode Idle operation is recommended for point-to-point
	applications. and is also used for Switched 56 kbps call set up signaling.
DSR	The state of the Data Set Ready lead (V.24 circuit 107).
DTR	The state of the Data Terminal Ready lead (V.24 circuit 108).
errored second	A performance measurement reported during a Digital Test that is defined as a
	second in which at least one error has been detected.
Facility Alarm	A failure condition reported to the NMS when there is a break in communication
(FA)	with one or more tributary.

Glossary-2 December 1996 3615-A2-GB20-20