Paradyne 3800PLUS manual carriers, with a total of 128 modems

COMSPHERE 3800Plus Modems

SDCP	Shared Diagnostic Control Panel. An optional user interface similar to the front panel of
	a 3810Plus modem that attaches to the front of a COMSPHERE 3000 Series Carrier.
	Installed at eye level into one COMSPHERE 3000 Series Carrier, it controls and
	monitors modems in all the carriers in the cabinet. A single SDCP can control up to
	8 carriers, with a total of 128 modems.
SDU	Shared Diagnostic Unit. A circuit card installed in Slot 0 of the COMSPHERE 3000
	Series Carrier that provides an interface between an optional SDCP and/or network
	management and 3811Plus modems.
Select key	An SDCP key that allows the selection of a specific card slot in the COMSPHERE
	3000 Series Carrier.
serial transmission	A way of transmitting data in which bits are sent sequentially one at a time.
Shared Diagnostic Unit	A circuit card that plugs into a dedicated slot in the COMSPHERE 3000 Series Carrier to
(SDU)	provide the SDCP and network management interfaces to the dial modems in the carrier.
	It translates the network management protocol to the devices in the carrier and routes
	incoming messages to the appropriate slots.
S-Registers	Registers that contains information affecting the modem parameters. All S-Registers
	must be preceded by the AT prefix.
Sync Dial	A factory preset configuration area containing configuration options most often used in
	synchronous dial networks.
synchronous	Data transmission that is synchronized by timing signals. Characters are sent at a fixed
transmission	rate. This type of transmission is more efficient than asynchronous transmission.
ter	Latin for ``thrice'' Used to distinguish the third version of a standard from other versions;
	e.g., V.27 ter.
terbo	See V.32terbo.
tone dialing	One of two dialing methods, in which telephone numbers are sent as tones across the
	telephone lines.
Top-Level menu	The very top of the menu tree that displays modem status and all Top-Level menu
	branches.
training	A process where two modems try to establish a connection over the VF line.
UL	Underwriter's Laboratories, Inc.
UNIX Dial	A factory preset configuration area containing the configuration options most often used
	in a UNIXr dial network.
USOC	Universal Service Ordering Codes.
VF	Voice Frequency. The part of the audio frequency range used to transmit voice sound
	(usually 300 Hz to 3400 Hz). This band is used by the modem for its modulated signal.
V.17	A fax communications standard for modems operating half-duplex with synchronous
	data at 14,400 bps.

Glossary-8 November 1996 3980-A2-GB30-20