Boca SoundExpression 14.4VSP, User Manual

Page: 66 / 96

66
SoundExpression
make/break ratio . The &P command controls the ratio of the off-hook (make) to on-hook
(break) interval used by the modem when it pulse dials. &P0 selects a 39%/61% make/break
ratio for use in the U.S. &P1 selects a 33%/67% make/break ratio for use in the United Kingdom
and Hong Kong. The &P command is NOT allowed in some countries.
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 ATDP sets the modem to pulse dialing, which is the default method as
opposed to tone dialing (push-button touch-tone) which is enabled with ATDT. 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.