參數(shù)資料
型號(hào)： MT90812
廠商： Mitel Networks Corporation
英文描述： Integrated Digital Switch (IDX)(集成數(shù)字開(kāi)關(guān))
中文描述： 綜合數(shù)字交換機(jī)（IDX的）（集成數(shù)字開(kāi)關(guān)）
文件頁(yè)數(shù)： 49/105頁(yè)
文件大小： 334K
代理商： MT90812
Advance Information
MT90812
45
Table 16 - Tone Ringer Programmable Frequencies
17.0 Frequency Shift Keying (FSK) Transmitter
The FSK transmitter is a phase coherent FSK modulator that generates two output frequencies, representing
the ‘marks’ and ‘spaces’, of the digital data loaded into the FSK transmit memory. The ‘mark’ and ‘space
frequencies are selectable to Bell 202 or CCITT V.23 standards at 1200 baud (refer to Table 17). The FSK
transmitter output is a PCM coded signal that can be directed to any outgoing local TDM channel.
Table 17 - FSK Signalling Frequencies
As with all outgoing channels, a gain from +3 to -27 dB in steps of 1dB, as well as -
output of the FSK transmitter. Refer to Section 7.0 for further description of gain control. The signal output level
is -6.12dBm0 (
μ
-Law) and -12.12 dBm0 (A-law), when the programmable gains are set at zero dB.
dB, may be applied to the
The FSK transmit memory is a 20-byte FIFO that is accessed at the address 07
H
. Refer to Control Register
addresses indicated in Table 20 on page 53. The FSK output is memory mapped to address 5F
H
as shown in
Table 3 on page 14. Fig. 26 illustrates the data flow for the FSK transmitter in the MT90812.
coef
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
freq
NA
4000.00
2666.67
2000.00
1600.00
1333.33
1142.86
1000.00
888.89
800.00
727.27
666.67
615.38
571.43
533.33
500.00
470.59
444.44
421.05
400.00
380.95
363.64
347.83
333.33
320.00
307.69
296.30
285.71
275.86
266.67
258.06
250.00
coef
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
freq
242.42
235.29
228.57
222.22
216.22
210.53
205.13
200.00
195.12
190.48
186.05
181.82
177.78
173.91
170.21
166.67
163.27
160.00
156.86
153.85
150.94
148.15
145.45
142.86
140.35
137.93
135.59
133.33
131.15
129.03
126.98
125.00
coef
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
freq
123.08
121.21
119.40
117.65
115.94
114.29
112.68
111.11
109.59
108.11
106.67
105.26
103.90
102.56
101.27
100.00
98.77
97.56
96.39
95.24
94.12
93.02
91.95
90.91
89.89
88.89
87.91
86.96
86.02
85.11
84.21
83.33
coef
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
freq
82.47
81.63
80.81
80.00
79.21
78.43
77.67
76.92
76.19
75.47
74.77
74.07
73.39
72.73
72.07
71.43
70.80
70.18
69.57
68.97
68.38
67.80
67.23
66.67
66.12
65.57
65.04
64.52
64.00
63.49
62.99
62.50
coef
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
freq
62.02
61.54
61.07
60.61
60.15
59.70
59.26
58.82
58.39
57.97
57.55
57.14
56.74
56.34
55.94
55.56
55.17
54.79
54.42
54.05
53.69
53.33
52.98
52.63
52.29
51.95
51.61
51.28
50.96
50.63
50.31
50.00
coef
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
freq
49.69
49.38
49.08
48.78
48.48
48.19
47.90
47.62
47.34
47.06
46.78
46.51
46.24
45.98
45.71
45.45
45.20
44.94
44.69
44.44
44.20
43.96
43.72
43.48
43.24
43.01
42.78
42.55
42.33
42.11
41.88
41.67
coef
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
freq
41.45
41.24
41.03
40.82
40.61
40.40
40.20
40.00
39.80
39.60
39.41
39.22
39.02
38.83
38.65
38.46
38.28
38.10
37.91
37.74
37.56
37.38
37.21
37.04
36.87
36.70
36.53
36.36
36.20
36.04
35.87
35.71
coef
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
freq
35.56
35.40
35.24
35.09
34.93
34.78
34.63
34.48
34.33
34.19
34.04
33.90
33.76
33.61
33.47
33.33
33.20
33.06
32.92
32.79
32.65
32.52
32.39
32.26
32.13
32.00
31.87
31.75
31.62
31.50
31.37
31.25
Mark
Space
Bell 202
1200
2200
CCITT V.23
1300
2100
∞
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