Telephone Line Emulator User’s Manual
40-400-00020, Rev. M
21
Figure 12. Caller ID Visual Message Waiting Screen 2
CAS Tone
CAS Tone is a CPE Alerting Signal; a Bellcore term for a tone used to alert CPE
equipment of Call Waiting, asking for ACKnowledgement prior to sending Caller ID. The
CAS Tone has several variables, including: Disabled, Single Tone or Dual Tone,
Duration, and Time to Wait for Acknowledgement.
With a selection of Single Tone the system will only generate the first tone. With a
selection of Tone 1 + Tone 2 the system will generate both tones with the specified
frequencies and amplitudes. Purchase of the International Module adds the selection of
Tone 1 x Tone 2. The system will generate Tone 1 modulation by Tone 2. In this
implementation only the fundamental and upper side tone are generated, both at the
amplitude programmed for Tone 1.
Frequency for Tone 1 and Tone 2 may be set from 10 Hz to 3000 Hz in 1 Hz increments
and -6 dBm to -60 dBm in 1 dBm increments.
Duration may be set from 70 mS to 90 mS in 5 mS increments.
After the TLE sends the CAS signal it waits a certain time for a DTMF ACKnowledgement
signal from the CPE device. If it sees this, it sends the FSK data. This Wait for
Acknowledgement time may be varied to ensure that CPE devices are responding within
the proper time window. Wait for Acknowledgement may be set from 100 mS to 300
mS in 5 mS increments.
FSK Tone
The FSK (Frequency Shift Key) Tones are programmable in both frequency and signal
level. The mark (1) tone is the lower of the two tones and is programmable from 1100 Hz
to 1400 Hz. The space (0) tone is the upper tone and is programmable from 2000 Hz to
2300 Hz. Both tone levels may be set from -10 dBm to -60 dBm in 1 dB increments.
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