Boca HOME OFFICE Podręcznik Użytkownika Pobierz pdf (Strona 67)

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.

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.

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.

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.

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.

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Boca HOME OFFICE Podręcznik Użytkownika Strona 67