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參數(shù)資料
| 型號(hào)： | XRT75VL00IVTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 20/50頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E3/DS3/STS-1 1CH 52TQFP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | DS3，E3，STS-1 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 52-LQFP |
| 供應(yīng)商設(shè)備封裝： | 52-TQFP（10x10） |
| 包裝： | 帶卷 (TR) |
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XRT75VL00
25
REV. 1.0.6
E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
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
HDB3 Encoding:
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.
NOTES:
1.
When Dual-Rail data format is selected, the B3ZS/HDB3 Encoder is automatically disabled.
2.
In Dual-Rail format, the Bipolar Violations in the incoming data stream is converted to valid data pulses.
3.
Encoder and Decoder is enabled only in Single-Rail mode.
4.3
TRANSMIT PULSE SHAPER:
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.
FIGURE 14. B3ZS ENCODING FORMAT
FIGURE 15. HDB3 ENCODING FORMAT
0
1
V
B
V
1
0
V
B
V
0
TClk
Line
Signal
TPDATA
0
1
V
B
V
1
0
V
0
TClk
Line
Signal
TPDATA
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