Paradyne 3510 User Manual
Page 80
COMSPHERE 3500 Series Data Service Units
Glossary-2
March 1999
3510-A2-GN32-60
Line Signal Detect
(LSD)
A signal issued by the DSU that indicates that it is connected to a functional digital
network.
Local Area Data Set
(LADS)
A mode of operation where the control and tributary DSUs are directly connected
via 4-wire, non-loaded metallic pairs rather than via a digital (DDS) network; they
do not pass data through a DDS network.
Local Loopback
(LL)
A type of diagnostic test in which data is looped through a DSU from the DTE
interface and back to the DTE.
modular DSU
A carrier-mounted circuit card that contains “gold finger” contacts that plug into a
rear connector plate. This circuit card type is easily removed from the front of the
carrier without having to disconnect cables. The Model 3511 is a modular DSU.
network interface
The digital network vendor’s termination device (modular jack, terminal block,
etc).
Network Management
System (NMS)
A generic term for the proprietary network management system associated with
3500 Series DSUs. Includes the DATAPHONE II diagnostic console (DC), network
controller (NC), system controller (SC), and 6800 Series NMS.
Out-of-Frame (OOF)
A digital network trouble signal that indicates that frame alignment has been lost.
Out-of-Service (OOS)
A digital network trouble signal that indicates the terminal or the access line is out
of order.
rear connector plate
A plate with two DTE connectors that is used with a Model 3511 DSU (a modular
DSU). The rear connector plate is mounted onto the rear of the carrier. It allows
removal of a Model 3511 DSU without first disconnecting the DTE cables at the
rear of the carrier.
Received Data (RXD)
A serial stream of digital information that is received by the DTE.
Regional Bell Operating
Company (RBOC)
A Bell Operating Company in a particular geographic area.
remote (REM)
Refers to a data service unit (DSU) that is at the other (far) end of a DDS network.
Remote Digital Loopback
(RL)
A digital loopback of a remote DSU initiated at the local DSU.
Request-to-Send
(RTS)
A signal generated by a data terminal equipment (DTE) to indicate that it has data
ready to transmit.
streaming terminal condition
(STR)
A condition that occurs when a multipoint network tributary DTE holds the RTS
lead on too long.
Test Pattern
(TP)
A test that generates a digital test pattern and verifies that the DSU is receiving the
same pattern.
Transmitted Data (TXD)
A serial stream of digital information that is transmitted by a DTE.
Universal Service
Ordering Codes (USOC)
Generic telephone company service ordering codes.