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參數(shù)資料
| 型號： | XR-T7288 |
| 廠商： | Exar Corporation |
| 英文描述： | CEPT1 Line Interface |
| 中文描述： | CEPT1線路接口 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 293K |
| 代理商： | XR-T7288 |
XR-T7288
10
Rev. 1.01
Transmit Converter
The line-interface transmission format is return-to-zero,
bipolar alternate mark inversion (AMI), requiring
transmission and sensing of alternately positive and
negative pulses. The transmit converter accepts unipolar
data and clock and converts the signal to a balanced
bipolar data signal. Binary 1s in the data stream become
pulses of alternating polarity transmitted between the two
output rails, T2 and R2. Binary 0s are transmitted as null
pulses.
The output pulse waveform is nominally rectangular. The
pulses are produced by a high-speed D/A converter and
are driven onto the line by low-impedance output buffers.
The positive and negative pulses meet CCITT
specification G.703 template requirements. The
normalized pulse template is shown in Figure 5.A block
diagram of the analog circuitry is shown in Figure 6.
The clock multiplier shown in Figure 6.uses a
phase-locked loop (PLL) to produce the high-speed
timing waveforms needed to produce a well-controlled
pulse width. The clock multiplier also eliminates the need
for the tightly.controlled transmit clock duty cycle usually
required in discrete implementations. Transmitter
specifications are shown in the Electrical Characteristics
table.
Figure 5. CCITT G.703 Pulse Template
20%
488ns
(244 + 244)
219ns
(244 - 25)
0%
50%
V = 100%
269ns
(244 + 25)
194ns
(244 - 50)
Nominal pulse
244ns
10%
10%
10%
10%
10%
10%
20%
20%
Note:
V corresponds to the nominal peak value
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XR-T7295E-1EIP | INTEGRATED LINE RECEIVER |
| XRT7295E | INTEGRATED LINE RECEIVER |
| XR-T7295E-1EIW | INTEGRATED LINE RECEIVER |
| XR-T7295E | INTEGRATED LINE RECEIVER |
| XR-T7295IP | DS3/Sonet STS-1 Integrated Line Receiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT7288IP | 制造商:Exar Corporation 功能描述: 制造商:Exar Corporation 功能描述:DATACOM, PCM TRANSCEIVER, PDIP28 |
| XR-T7288IP | 制造商:EXAR 制造商全稱:EXAR 功能描述:CEPT1 Line Interface |
| XRT7288IW | 制造商:EXAR 制造商全稱:EXAR 功能描述:CEPT1 Line Interface |
| XR-T7288IW | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCM Transceiver |
| XR-T7295 | 制造商:EXAR 制造商全稱:EXAR 功能描述:DS3/Sonet STS-1 Integrated Line Receiver |
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