MT90812 Mitel Networks Corporation, MT90812 Datasheet - Page 48

• Manufacturer Part Number: MT90812
• Description: Integrated Digital Switch (IDX)
• Manufacturer: Mitel Networks Corporation

MT90812
Note 1: 1st and 2nd programmable tones can be programmed as dual frequency squarewave Tone Ringer signals
Note 2: 7th programmable tone is replaced with FSK signal when FSK Transmitter is enabled.
16.1
Of the 7 programmable tone generators the first two can be used to provide dual frequency squarewave ringing
signals. To enable this mode and generate the squarewave ringing signals, the Tone Ringer Enable bits, TRE1
and TRE2, in the Tone Generation and Energy Detect Control Register (TEDC) must be set. TRE1 and TRE2
enable the first and second Tone Ringer circuits, respectively. The digital tone generator uses the values
programmed into the low and high Tone Coefficient Registers to generate two different squarewave
frequencies. Both coefficients are determined by the following equation:
Coef = [8000/Frequency(Hz)] - 1
where Coef is an integer between 1 and 255. This produces frequencies between 31.25 - 4000 Hz with a non-
linear resolution as shown in Table 16. The ringer program switches between these two frequencies at a 5 Hz
or 10 Hz rate as selected by the WR bit in the TEDC register.
44
Addr
0C
0D
0A
0B
0E
0F
00
01
02
03
04
05
06
07
08
09
Tone Ringer
Frequency(Hz)
697+1209
697+1336
697+1477
697+1633
770+1209
770+1336
770+1477
770+1633
852+1209
852+1336
852+1477
852+1633
941+1209
941+1336
941+1477
941+1633
DTMF digits 1
DTMF digit A
DTMF digit B
DTMF digit C
DTMF digit D
DTMF digit 2
DTMF digit 3
DTMF digit 4
DTMF digit 5
DTMF digit 6
DTMF digit 7
DTMF digit 8
DTMF digit 9
DTMF digit 0
DTMF digit #
DTMF digit *
Application
Table 15 - Tone Block Address
Addr
1A
1B
1C
1D
1E
10
11
12
13
14
15
16
17
18
19
1F
Frequency(Hz)
350+440
440+480
440+620
480+620
400+450
L1+H1
L2+H2
L3+H3
L4+H4
L5+H5
L6+H6
L7+H7
1400
440
400
425
Application (Type of cadenced tones
Busy, Conference Exterior, Call Waiting
Audible Ringback, Special Audible
Call Waiting, Busy Verification,
Dial Tone, Recall Dial Tone,
Reorder Tone, Busy Tone
Executive Override
Confirmation Tone
Audible Ring Tone
Programmable 1
Programmable 2
Programmable 7
Programmable 3
Programmable 4
Programmable 5
Programmable 6
Advance Information
Intercept Tone
Intrusion Tone
generated)
Ringback
Dial Tone
1
1
2