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參數(shù)資料
| 型號： | TECO3264 |
| 廠商： | Lineage Power |
| 英文描述： | 32-Channel Echo Canceller(32通道回波清除器) |
| 中文描述： | 32通道回聲消除器（32通道回波清除器） |
| 文件頁數(shù)： | 27/128頁 |
| 文件大?。?/td> | 2328K |
| 代理商： | TECO3264 |
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Data Sheet
August 1999
TECO3264 32-Channel Echo Canceller
27
Lucent Technologies Inc.
External Control Connection
(continued)
PCM Input/Output (I/O) Timing and Register Control
(continued)
4.
Adjust the XDLY* value such that TS0 in the XPCM data coincides with TS0 in the CPCM data. If bit 0 of
XPCM (TS0) is received more than 3.9 ms from the reference clock edge (FE), it will be considered internally
by the echo canceller as the time-slot location where it actually falls into within the 125 ms frame. For example,
if bit 0 (TS0) is being received 20 ms from FE, then TS0 will be treated (internally by the echo canceller) as
channel 5 (the sixth time slot). This means that TS27 is being treated as channel 0 (the first time slot) by the
echo canceller. For the purpose of setting the right transmission parameters, place the sequence given in (3) in
time slot 27 and set register 0x1C to 0x00. The sequence will begin 0.5 ms from FE.
Record the initial value of CER. Measure the offset depending on the values of [X, Y]RCE and FE. Suggested
values are [X, Y]RCE = 1 and FE = 1. Also remember that X data is sampled in the middle of the data bit.
Using Table 5, Programming Values (CER = Decimal) for [X, Y]RBOFF, When CMS = 1, or Table 7, Program-
ming Values (CER = Decimal) for [X, Y]RBOFF, When CMS = 0, locate the corresponding [X,Y]RBOFF value.
This value depends on the values of CER, FE, and [X,Y]RCE.
Use Table 3, Relationship Between CET and CER, When CMS = 1, on page 24 or Table 4, Relationship
Between CET and CER, When CMS = 0, on page 24 to determine the value of CET. CET depends on what
edge ([C, E]XCE) the user wishes to transmit the data. FE must be the same as the one used in (6).
Read the corresponding XRBOFF and CXBOFF values.
Set the same offsets for both X and Y as well as C and E.
10. YDLY is XDLY-4.
5.
6.
7.
8.
9.
* It is assumed that the user has already downloaded the recommended values as given in this data sheet.
Table 5. Programming Values (CER = Decimal) for [X, Y]RBOFF, When CMS = 1
Table 6. Programming Values (CET = Decimal) for [C, E]XBOFF, When CMS = 1
Table 7. Programming Values (CER = Decimal) for [X, Y]RBOFF, When CMS = 0
FE
XRCE/
YRCE
XRBOFF, YRBOFF
7
0111
30
28
30
28
0
0000
66
64
66
64
1
0001
6
4
6
4
2
0010
10
8
10
8
3
0011
14
12
14
12
4
0100
18
16
18
16
5
0101
22
20
22
20
6
0110
26
24
26
24
8
1000
34
32
34
32
9
1001
38
36
38
36
A
1010
42
40
42
40
B
1011
46
44
46
44
C
1100
50
48
50
48
D
1101
54
52
54
52
E
1110
58
56
58
56
F
1111
62
60
62
60
0
0
1
1
0
1
0
1
FE
CXCE/
EXCE
CXBOFF, EXBOFF
7
0111
34
32
34
32
0
0000
6
4
6
4
1
0001
10
8
10
8
2
0010
14
12
14
12
3
0011
18
16
18
16
4
0100
22
20
22
20
5
0101
26
24
26
24
6
0110
30
28
30
28
8
1000
38
36
38
36
9
1001
42
40
42
40
A
1010
46
44
46
44
B
1011
50
48
50
48
C
1100
54
52
54
52
D
1101
58
56
58
56
E
1110
62
60
62
60
F
1111
2
0
2
0
0
0
1
1
0
1
0
1
FE
[X, Y]
XCE
[C, E]
RCE
XRBOFF, YRBOFF
7
0111
30
30
28
28
30
30
28
28
0
0000
2
2
0
0
2
2
0
0
1
0001
6
6
4
4
6
6
4
4
2
0010
10
10
8
8
10
10
8
8
3
0011
14
14
12
12
14
14
12
12
4
0100
18
18
16
16
18
18
16
16
5
0101
22
22
20
20
22
22
20
20
6
0110
26
26
24
24
26
26
24
24
8
1000
34
34
32
32
34
34
32
32
9
1001
38
38
36
36
38
38
36
36
A
1010
42
42
40
40
42
42
40
40
B
1011
46
46
44
44
46
46
44
44
C
1100
50
50
48
48
50
50
48
48
D
1101
54
54
52
52
54
54
52
52
E
1110
58
58
56
56
58
58
56
56
F
1111
62
62
60
60
62
62
60
60
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
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