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Glossary
Glossary-73980-A2-GB30-20 November 1996
Originate mode The modem is in a state where it is ready to transmit a call. In a dial network, it is the
modem that makes the call. In a leased-line network, it is one of two sides of the network
that is selected to be the originating modem.
parity A way of checking data accuracy by counting the number of bits that have a value of
one.
PBX Telephone switching equipment (Private Branch Exchange) dedicated to one customer
. A
PBX connects private telephones to each other and to the public dial network.
permissive interface A dial modem operating mode characterized by a fixed output power level of –9 dBm.
physical address The diagnostic address of a control modem derived from its location in the carrier: its
carrier and slot number.
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 T
elephone Network. A network shared among many users who can use
telephones to establish connections between two points. Also known as dial network.
pulse dialing One of two dialing methods, in which telephone numbers are sent as pulses (brief
changes in voltage or current intensity) across the telephone line. Rotary telephones use
pulse dialing.
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.
remote mode indicator
An inverse video that indicates the modems are operating in Remote mode.
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.
RJ11C A type of 6-position jack normally used with permissive dial networks and telephone
sets.
RJ21X A type of 50-position jack normally used with permissive dial networks providing the
appropriate conductors for up to eight telephone lines.
rotary A TELCO service whereby multiple lines to a customer premise share a common
telephone number.
RS-232D An Electronic Industries Association’s standard defining the 25-position interface
between data terminal equipment and data communications equipment.