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modulation handshake
. Also referred to as Automode Enable and is
controlled by the ATN command. This determines whether or not the
modem must connect at a particular speed, or allow connection at
any speed supported by both modems.
N
negotiation fallback . Controlled by S-Register 36 as part of the V.42
protocol. Setting this register indicates what action to take when a
desired connection cannot be made (e.g., hang-up, direct mode
connect, normal mode connect).
non-volatile RAM . Also NVRAM. Random access memory whose
data is retained when power is turned off. This is especially useful for
modems to store user-defined default configuration settings and
frequently used telephone numbers. This information would be
loaded into modem RAM at power-up.
O
on-line state . Same as data mode. To transmit or receive data, the
modem must be in the on-line state. When placing a call, the modem
is put on-line with the dial command.
P
PBX
. Private Branch Exchange. A telephone switch at a customer site.
pulse dialing . Also referred to as rotary dialing, i.e., dialing with the
older-style rotary dial wheel. The dial modifier ATP sets the modem
to pulse dialing, which is the default method as opposed to tone
dialing (push-button touch-tone) which is enabled with ATT. All
telephone exchanges will accept older-style pulse dialing and most
exchanges will accept modern tone-dialing. Tone dialing is faster and
more reliable since mechanical relays and their inherent failure
mechanisms are avoided.
R
result code
. A response sent by the modem after executing a
command. The response reports the modem’s status or the progress of
a call and can take the form of either digits (numeric) or words
(verbose). Issuing a V1 command enables word responses. A V0 (V-
zero) command enables numeric responses. The Q1 command
disables their use entirely. Example: “OK” (word), or 0 (numeric)
indicates that the modem successfully executed a command.
HOMEOFF.PM6 5/9/97, 9:15 AM 67