Telephone Line Emulator User’s Manual
40-400-00020, Rev. M
33
Cadence - Group 1, 2, 3
Cadence may be set for 1, 2 or 3 sequences from 0 to 3 seconds on and 0 to 10 seconds
off in 5 mS increments.
Ringback
Ringback is the audible tone heard by a caller while ringing is applied to the called line.
The TLE Ringback tone will match the Ring cadence of the Line called and is
programmable as a single or dual frequency with programmable levels and is applied to all
lines. 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 TLE-INTL Software 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 range for Tone 1 and Tone 2 may be set from 10 Hz to 1000 Hz in 1 Hz
increments.
Output Level may be set from -6 dBm to -60 dBm per tone in 1 dB increments.
Special Information Tones/Number Unobtainable Tone
SIT (Special Information Tones) consists of three tones that are generated by the network
when an abnormal condition exists. These have evolved over time to be primarily used
before audio announcements that indicate “All circuits are busy, please try your call again
later”, “The number you have dialed is no longer in service”, and other audio
announcements. The TLE allows the programming of the Frequency, Signal Level, and
On/Off Durations for these tones.
Countries other than US/Canada may use a Number Unobtainable Tone response. This
feature is available when the TLE International Module is purchased.
Figure 21. Special Information Tones/Number Unobtainable Tone Screen
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