Paradyne COMSPHERE 3800PLUS User Manual page 208

COMSPHERE 3800Plus Modems
online The state of a modem that is connected to and communicating with another modem.
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
Private Branch Exchange. Telephone switching equipment dedicated to one customer. A PBX
connects private telephones to each other and to the public dial network.
PC Personal Computer.
permissive interface
A dial modem operating mode characterized by a fixed output power level of –9 dBm. It is one of
two possible modes of operation for modems connected to dial lines (see programmable
interface).
POTS
Plain Old Telephone Service. Standard telephone service over the PSTN, with an analog
bandwidth of less than 4 KHz.
power-up self-test A test that checks most hardware components when power is applied to the device or a reset is
initiated.
product code
A three-digit code indicating the modem's highest VF data rate.
programmable A dial modem operating mode characterized by an output power level (–12 to 0 dBm) set by a
programming resistor in the jack. It is one of two possible modes of operation for modems
interface
connected to dial lines (see permissive interface).
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.
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 device's memory that holds stored values.
remote
Files, devices, and users not attached to your local DTE.
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 An inverse video symbol that indicates the modems are operating in Remote mode.
indicator
reset An initialization of the device that occurs at power-up or in response to a reset command.
result code An asynchronous message (in either numbers or words) that the device sends to the DTE after
executing or trying to execute a command.
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 telephone company service whereby multiple lines to a customer site share a common
telephone number.
RS-232-D
An Electronic Industries Association's standard defining the 25-position interface between data
terminal equipment and data communications equipment.
RTS Request to Send. A signal from the DTE to the device, indicating that the DTE has data to send.
V.24 circuit 105.
SDC
Synchronous Data Compression. A proprietary compression and error correction protocol.
Glossary-6 October 1998 3980-A2-GB30-40