COMSPHERE 3600 Series Data Service Units
Glossary-8 December 1996 3610-A2-GB46-60
option sets Sets of configuration options (or libraries) that are related and fulfill a specific function. For example, the
Diagnostic (Diag branch) configuration options allow you to configure the DSU for performing
diagnostic functions. This option set (or library) contains 16 configuration options related to the DSU’s or
DBM’s diagnostic operation.
partial backup Partial backup on multipoint circuits is possible when not all tributaries are affected by a network failure.
The tributaries that are affected by the network failure communicate with the control DSU through a
backup connection.
PCC Pseudo Carrier Control. Used by tributaries in a multipoint environment to communicate with the control
device via manipulation of the RTS Control Signal. Also known as V.13 signaling.
permissive interface A dial modem operating mode characterized by a fixed output power level of –9 dBm.
pF Picofarads.
point-to-point circuit A data network circuit with one control and one tributary.
port sharing FEP port sharing allows transmissions and controls received by the first port to be sent to the second port
in the port sharing group.
primary core The circuit card that is normally running when power is supplied to the unit. In the case of a DBM-D,
DBM-I, DBM-S, or DBM-V, the primary core and the active core are the same.
protocol The rules for timing, format, error control, and flow control during data transmission.
PSTN Public Switched Telephone Network. A network shared among many users who can use telephones to
establish connections between two points.
rate adaption Used when the DSU or DBM operates at a speed greater than the DTE. This capability is enabled
automatically when the port speed is set lower than the line speed.
rear connector plate Used with modular devices, a connector plate is installed onto the rear of the COMSPHERE 3000 Series
Carrier. It contains two DTE connectors and functions as an interface between the modular device and the
DTE.
REN Ringer Equivalence Number. Used to determine the quantity of devices with ringers that may be
connected to a telephone line.
reset A reinitialization of the device that occurs at power-up or in response to a reset command.
RMA Return Material Authorization. Provided by customer assistance center for equipment return.
RTS Request to Send. A signal from the DTE to the modem, sent via Pin 4 of the EIA-232 interface, that states
the DTE has data to send.
RXD Received Data. Pin 3 of the EIA-232 interface that is used by the DTE to receive data from the modem.
Conversely, the modem uses Pin 3 to transmit data to the DTE.
SDCP Shared Diagnostic Control Panel. A feature that allows carrier-mounted devices to share the same
diagnostic control panel. Installed into one COMSPHERE 3000 Series Carrier, it controls and monitors
the devices in all the carriers in the cabinet. A single SDCP can control up to 8 carriers, with a total of
128 devices.
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 system and the devices in
the carrier.
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