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Glossary

Glossary-93920-A2-GH30-40 October 1998

SDU 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.

secondary channel A data transmission channel with a lower signaling rate than the primary channel. It is

mostly used for modem diagnostics.

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.

Singleport mode 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.

S-Registers Registers that contain information affecting the modem parameters. All S-Registers must

be preceded by the AT prefix.

SubHS Sub-Network Health and Status. A display of alarm occurrences in downstream modems.

synchronous transmission 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.

TDM 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.

TMp Trellis Multipoint. Paradyne’s proprietary high speed, fast poll multipoint modulation

scheme.

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.

trellis-coded modulation A modulation scheme developed by Paradyne which uses Forward Error Correction for

multipoint and high-speed point-to-point applications.

tributary modem Tributary modems in a network receive data from the control modem, as well as from the

network management system in the network.

UL Underwriter’s Laboratories, Inc.

UNIX Dial A factory preset configuration area containing the configuration options most often used

in a UNIX dial network.

upstream modem A device connected “closer” to the host computer.

USOC Universal Service Ordering Codes.

1 2 ... 340 341 342 343 344 345 346 347 348 349 350 ... 353 354

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Zhone 3920Plus Manual de Instruções Página 345