BT8370KPF

Manufacturer Part NumberBT8370KPF
DescriptionFully integrated T1/E1 framer and line interface
ManufacturerConexant Systems, Inc.
BT8370KPF datasheet
 


Specifications of BT8370KPF

CaseQFP  
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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
Page 51
52
Page 52
53
Page 53
54
Page 54
55
Page 55
56
Page 56
57
Page 57
58
Page 58
59
Page 59
60
Page 60
61
62
63
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
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
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
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
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
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
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
Page 51/323

Download datasheet (3Mb)Embed
PrevNext
Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
Table 2-3. Criteria for Loss/Recovery of Receive Framer Alignment (1 of 2)
Mode
FAS
Basic Frame Alignment (BFA) is recovered when the following search criteria are satisfied:
FAS pattern (0011011) is found in frame N.
Frame N+1 contains bit 2 equal to 1.
Frame N+2 also contains FAS pattern (0011011).
During FAS-only modes, BFA is recovered when the following search criteria are satisfied:
FAS pattern (0011011) is found in frame N.
No mimics of the FAS pattern are present in frame N+1.
FAS pattern (0011011) is found in frame N+2.
If FAS pattern is not found in frame N+2, or if FAS mimic is found in frame N+1, the search restarts in
NOTE(S):
frame N+2.
Loss of FAS frame alignment (FRED) is declared when 1 of the following criteria is met:
Three consecutive FAS pattern errors are detected when the FAS pattern consists of a 7-bit (x0011011)
pattern in FAS frames, and if FS_NFAS is also active [addr 045], the FAS pattern includes bit 2 of NFAS
frames.
Loss of MFAS (MRED) is due to 915 or more CRC errors out of 1000.
Failure to locate two valid MFAS patterns within 8 ms after BFA.
In all cases, FRED causes next search for FAS alignment to begin 1 bit after the current FAS location.
NOTE(S):
BSLIP
FAS Bit Slip Enable. Applicable only for Dutch PTT national applications. If BSLIP is enabled, the online framer is
allowed to change RX timebase by 1 bit when a 1-bit FAS pattern slip is detected. BSLIP does not affect the offline
framer's search criteria.
MFAS
CRC4 Multiframe Alignment is recovered when the following search criteria are satisfied:
BFA is recovered, identifying FAS and NFAS frames.
Within 8 ms after BFA, bit 1 of NFAS frames contains two MFAS patterns (001011xx). The second MFAS
must be aligned with respect to first MFAS, but the second MFAS pattern is not necessarily received in
consecutive frames.
Within 8 ms after BFA, bit 1 of NFAS frames contains the second MFAS pattern (001011xx), aligned to first
MFAS.
Loss of MFAS alignment (MRED) declared when 1 of the following criteria is met:
915 or more CRC4 errors out of 1000 (submultiframe) blocks.
Loss of FAS (FRED).
If Disable 915 CRC Reframe is set [RLOFD; addr 040], then MRED is activated only by FRED.
NOTE(S):
CAS
CAS Multiframe Alignment is recovered when the following search criteria are satisfied:
BFA is recovered, identifying TS0 through TS31.
MAS (0000xxxx) multiframe alignment signal pattern is found in the first 4 bits of TS16, and 8 bits of TS16
in preceding frame contains non-0 value.
Loss of CAS alignment (SRED) is declared when 1 of the following criteria is met:
Two consecutive MAS pattern errors are detected.
TS16 contains all 0s in 2 multiframes (32 consecutive frames).
Loss of FAS (FRED).
FT Only
Terminal frame alignment is recovered when the following occurs:
The first valid Ft pattern (1010) is found in 12 alternate F-bit locations (3 ms), where F-bits are separated by 193
bits.
During Ft-only mode, loss of frame alignment (FRED) is declared when the number of Ft bit errors detected meets
selected loss of frame criteria [RLOFA–RLOFC; addr 040].
N8370DSE
Description
Conexant
2.0 Circuit Description
2.4 Receiver
2-23