Paradyne COMSPHERE 3920PLUS Technical Reference Manual page 346

SDU
secondary channel
Select key
serial transmission
Singleport mode
S-Registers
SubHS
synchronous transmission
TDM
TMp
Top-Level menu
training
trellis-coded modulation
tributary modem
UL
UNIX Dial
upstream modem
USOC
3920-A2-GH30-40
Shared Diagnostic Unit. A circuit card that plugs into a dedicated slot in the
COMSPHERE 3000 Series Carrier to provide the SDCP and network management
interfaces to the modems in the carrier. It translates the network management protocol to
the devices in the carrier and routes incoming messages to the appropriate slots.
A data transmission channel with a lower signaling rate than the primary channel. It is
mostly used for modem diagnostics.
An SDCP key that allows the selection of a specific card slot in the COMSPHERE 3000
Series Carrier.
A way of transmitting data in which bits are sent sequentially one at a time.
A mode of operation available on both the 392xPlus singleport and multiport modems.
Singleport mode only supports one port. For the multiport modem, it is in effect when
the MUX mode configuration option is set to Disable. Singleport mode is the only
operational mode for the singleport modem.
Registers that contain information affecting the modem parameters. All S-Registers must
be preceded by the AT prefix.
Sub-Network Health and Status. A display of alarm occurrences in downstream modems.
Transmission in which the data characters and bits are transmitted at a fixed rate with
transmitter and receiver synchronized. This eliminates the need for start and stop bits as
used in asynchronous transmission, and is thus faster and more efficient.
Time Division Multiplexer. A device that enables the simultaneous transmission of
multiple independent data streams into a single high-speed data stream by
simultaneously sampling the independent data streams and combining these samples to
form the high-speed stream.
Trellis Multipoint. Paradyne's proprietary high speed, fast poll multipoint modulation
scheme.
The very top of the menu tree that displays modem status and all Top-Level menu
branches.
A process where two modems try to establish a connection over the VF line.
A modulation scheme developed by Paradyne which uses Forward Error Correction for
multipoint and high-speed point-to-point applications.
Tributary modems in a network receive data from the control modem, as well as from the
network management system in the network.
Underwriter's Laboratories, Inc.
A factory preset configuration area containing the configuration options most often used
in a UNIX dial network.
A device connected "closer" to the host computer.
Universal Service Ordering Codes.
October 1998
Glossary
Glossary-9