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參數(shù)資料
| 型號： | XRT75VL00 |
| 廠商： | Exar Corporation |
| 英文描述： | E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
| 中文描述： | E3/DS3/STS-1線路接口單元與抖動衰減器 |
| 文件頁數(shù)： | 27/50頁 |
| 文件大?。?/td> | 268K |
| 代理商： | XRT75VL00 |
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XRT75VL00
REV. 1.0.3
E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
25
An example of B3ZS encoding is shown in Figure 14. If the encoder detects an occurrence of three
consecutive zeros in the data stream, it is replaced with either B0V or 00V, where ‘B’ refers to Bipolar pulse
that is compliant with the Alternating polarity requirement of the AMI (Alternate Mark Inversion) line code and
‘V’ refers to a Bipolar Violation (e.g., a bipolar pulse that violates the AMI line code). The substitution of B0V or
00V is made so that an odd number of bipolar pulses exist between any two consecutive violation (V) pulses.
This avoids the introduction of DC component into the line signal.
4.2.2
An example of the HDB3 encoding is shown in Figure 15.If the HDB3 encoder detects an occurrence of four
consecutive zeros in the data stream, then the four zeros are substituted with either 000V or B00V pattern. The
substitution code is made in such a way that an odd number of bipolar (B) pulses exist between any
consecutive V pulses. This avoids the introduction of DC component into the analog signal.
HDB3 Encoding:
N
OTES
:
1.
2.
3.
When Dual-Rail data format is selected, the B3ZS/HDB3 Encoder is automatically disabled.
In Dual-Rail format, the Bipolar Violations in the incoming data stream is converted to valid data pulses.
Encoder and Decoder is enabled only in Single-Rail mode.
T
RANSMIT
P
ULSE
S
HAPER
:
The Transmit Pulse Shaper converts the B3ZS encoded digital pulses into a single analog Alternate Mark
Inversion (AMI) pulse that meet the industry standard mask template requirements for STS-1 and DS3. See
Figure 8 and Figure 9.
For E3 mode, the pulse shaper converts the HDB3 encoded pulses into a single full amplitude square shaped
pulse with very little slope. This is illustrated in Figure 7.
4.3
F
IGURE
14. B3ZS E
NCODING
F
ORMAT
F
IGURE
15. HDB3 E
NCODING
F
ORMAT
0
0
0
1
1
1
1
1
1
1
V
B
V
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
V
B
V
0
0
0
TClk
Line
Signal
TPDATA
0
0
0
0
0
1
1
1
1
1
1
1
V
B
V
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
V
0
0
0
0
TClk
Line
Signal
TPDATA
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相關(guān)代理商/技術(shù)參數(shù) |
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| XRT75VL00_08 | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
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| XRT75VL00D1V-F | 制造商:Exar Corporation 功能描述: |
| XRT75VL00DES | 功能描述:時鐘合成器/抖動清除器 1CHT3/E3/STS1LIU+ DESYNC 3.3V DRV VER RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
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