MicroNet SP5004 Uživatelský manuál stáhnout pdf (Strana 50)

Audible tones are used in the telephone system to indicate the progress or disposition

of a call. Precise dial tone consists of Current day "precise" tones consist of a

summation of two low distortion sine waves.

The Dial Tone signal is used in Public Switched Telephone Networks to indicate that

the telephone network switching equipment has recognized that a telephone has gone

off-hook, and the switching equipment is prepared to receive the dialed digits or DTMF

codes.

The Ring-back signal is used in Public Switched Telephone Networks to indicate to the

caller that the called number is not busy, and that the line is being "rung" or signaled

that an incoming call is present. In most cases, the ring-back signal has the same

cadence as the ring generators used in that country, but the ring-back and ring

generators are usually not synchronized with one another.

The Busy signal is used in Public Switched Telephone Networks to indicate that the

called party is already taking another call. On most switching systems, the busy signal

will be emitted until the caller goes on-hook.

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MicroNet SP5004 Uživatelský manuál Strana 50