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Glossary
PSTN
Public Switched Telephone Network. This term is used to refer to
a normal land-line telephone network (as opposed to a cellular
telephone 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.
R
RAM
Random Access Memory. Read/Write memory which is volatile
(loses its contents when the device is powered down). The
modem uses this type of memory to buffer (temporarily store)
data.
register
A part of the modem's memory that contains values that
determine the modem's operating characteristics.
response code
An asynchronous message (in either numbers or words) that the
modem sends to the computer after executing or trying to
execute a command. Also called a result code.
ROM
Read Only Memory. This is nonvolatile memory which cannot be
written to. The modem's operational firmware is stored in this
type of memory.
RTS
Request to Send. A signal from the computer to the modem that
states the computer has data to send.
RXD
Receive Data. A signal that is used by the computer to receive
data from the modem. Conversely, the modem uses TXD to
transmit data to the computer.
GL-8
Issue 2
May 1995
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