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參數(shù)資料
| 型號： | HC-5560 |
| 廠商： | Intersil Corporation |
| 英文描述： | PCM Transcoder |
| 中文描述： | 的PCM碼器 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 67K |
| 代理商： | HC-5560 |
73
with N Zero Substitution. B6ZS is used commonly in North
American T2 (6.3212MHz) carriers. For every string of 6
zeros, bipolar code is substituted according to the following
rule:
If the immediate preceding pulse is of (
-
) polarity, then
code each group of 6 zeros as 0+
-
0+
-
, and if the
immediate preceding pulse is of (+) polarity, code each
group of 6 zeros as 0+
-
0
-
+.
One can see the consecutive logic 1 pulses of the same
polarity violate the AMI coding scheme.
e.g.,
B8ZS is used commonly in North American T1 (1.544MHz)
and T1C (3.152MHz) carriers. For every string of 8 zeros,
bipolar code is substituted according to the following rules:
1. If the immediate preceding pulse is of (
-
) polarity, then
code each group of 8 zeros as 000
-
+ 0+
-
.
2. If the immediate preceding pulse is of (+) polarity then
code each group of 8 zeros as 000+
-
0
-
+.
e.g.,
The BNZS coding schemes, in addition to eliminating DC
wander, minimize timing jitter and allow a line error monitor-
ing capability.
Another coding scheme is HDB3, high density bipolar 3, used
primarily in Europe for 2.048MHz and 8.448MHz carriers. This
code is similar to BNZS in that it substitutes bipolar code for 4
consecutive zeros according to the following rule:
1. If the polarity of the immediate preceding pulse is (
-
)
and there have been an odd (even) number of logic 1
pulses since the last substitution, each group of 4 con-
secutive zeros is coded as 000
-
(+00+).
2. If the polarity of the immediate preceding pulse is (+)
then the substitution is 000+(
-
00
-
) for odd (even) num-
ber of logic 1 pulses since the last substitution.
e.g.,
The 3 in HDB3 refers to the coding format that precludes
strings of zeros greater than 3. Note that violations are pro-
duced only in the fourth bit location of the substitution code
and that successive substitutions produce alternate polarity
violations.
0
1
0
0
0
0
0
-
0
0
0
0
1 1 1
1
0
0
+
+
-
0
0
+
-
-
+
V
V
V
V
B6ZS (+)
B6ZS (
-
)
PCM CODE
6
V = VIOLATION
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-
+
+
-
-
-
+
+
V
V
V
V = VIOLATION
PCM CODE
B8ZS (
-
)
B8ZS (+)
8
PCM CODE
0
1
0
0
0
0
0
0
0 0
0
0
0
0
0
0
0
1
1 1
1
0
0
0
0
0
-
+
-
-
+
+
V = VIOLATION
HDB3 (-)
HDB3 (+)
V
V
V
V
4
4
HC-5560
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HC3-5560-5 | PCM Transcoder |
| HC0437D | LCD Display Driver |
| HC0437P | LCD Display Driver |
| HC0437Y | LCD Display Driver |
| HC0438AD | LCD Display Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HC-5560_03 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:PCM Transcoder |
| HC5572 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| HC5580 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| HC5581 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| HC5590 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Interface IC |
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