Paradyne COMSPHERE 3920PLUS Series, Техническое справочное руководство

Страница: 345 / 356

COMSPHERE 392xPlus Modems
Glossary-8 October 1998 3920-A2-GH30-40
phase jitter A rapid or repeated shifting of the relative phase of a signal resulting in unwanted
distortion.
physical address The diagnostic address of a control modem derived from its location in the carrier: its
carrier and slot number.
point-to-point line A line or circuit connecting two stations.
poll list A list containing the network management addresses of downstream modems.
power-up self-test A test that checks most hardware components when the modem is powered-on.
product code A three-digit code indicating the modem’s highest VF data rate.
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. Also known as dial network.
Quick Configuration
display An informative display screen available from the modem’s Top-Level display. It provides
such information as network position (control or tributary), network management
address, DTE mode (Asynchronous or Synchronous), Line mode (Leased Answer,
Leased Originate, or Dial), and the modulation scheme used by the modem.
register A part of the modem’s memory that contains values that determine the modem’s
operating characteristics.
Remote A branch of the Top-Level menu that permits access to the DCP of another modem.
remote loopback A test that sends a signal to the remote modem to test the local modem, the remote
modem, and the circuit between them.
result code An asynchronous message (in either numbers or words) that the modem sends to the
DTE after executing or trying to execute a command.
Return to Dial A function available when in Dial Backup mode that allows the modem to switch to
dial-line operation when currently on leased lines.
RJ11 A type of 6-position jack normally used with permissive dial networks and telephone
sets.
RJ21 A type of 50-position jack normally used with permissive dial networks providing the
appropriate conductors for up to eight telephone lines.
RTS Request to Send. A signal from the DTE to the modem, indicating that the DTE has data
to send.
SDCP Shared Diagnostic Control Panel. An optional user interface that attaches to the front of a
COMSPHERE 3000 Series Carrier. Its functionality is very similar to that of the DCP.
Installed in 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.
SDLC Synchronous Data Link Control. An IBM standard data link protocol.