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參數(shù)資料
| 型號： | XRT5997 |
| 廠商： | Exar Corporation |
| 英文描述： | Seven-Channel E1 Line Interface Unit(7通道 E1線接口單元) |
| 中文描述： | 七通道E1線路接口單元（7通道素E1線接口單元） |
| 文件頁數(shù)： | 19/37頁 |
| 文件大?。?/td> | 367K |
| 代理商： | XRT5997 |
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XRT5997
19
Rev. 1.0.0
SYSTEM DESCRIPTION
The XRT5997 device is a Seven (7) channel E1
transceiver that provides an electrical interface for
2.048Mbps applications. Each of the seven channels
includes a receive circuit that converts an ITU-T G.703
compliant bipolar signal into a TTL compatible logic
levels. Each receiver also includes an LOS (Loss of
Signal) detection circuit. Similarly, in the Transmit
Direction, each Transmitter converts TTL compatible
logic levels into a G.703 compatible bipolar signal.
The Transmitter may be operated in either a “Clocked”
or “Clockless” Mode.
Each channel within the XRT5997 LIU device consists
of both a Transmit Section and a Receive Section,
each of these sections will be discussed in detail
below.
1.0 The Transmit Section
In general, the purpose of the “Transmit Section”
(within each channel of the XRT5997 device) is to
accept TTL/CMOS level digital data (from the Terminal
Equipment), and to encode it into a format such that it
can:
1. Be efficiently transmitted over coaxial- or twisted-
pair cable at the E1 data rate; and
2. Be reliably received by the Remote Terminal
Equipment at the other end of the E1 data link.
3. Comply with the ITU-T G.703 pulse template
requirements, for E1 applications.
The circuitry that the Transmit Section (within the
XRT5997 device) uses to accomplish this goal is
discussed below. The Transmit Section of the
XRT5997 device consists of the following blocks:
Transmit Input Interface
Pulse Shaping Block
1.1
The Transmit Input Interface
The Transmit Input Interface accepts either “clocked”
or “clockless” data from the Terminal Equipment. The
manner in how the Terminal Equipment should apply
data to a given channel within the XRT5997 device
depends upon whether the channel is being operated in
the “clocked” or “clockless” mode.
1.2.1 Operating the Transmitter in the Clocked
Mode
The user can configure a given channel (within the
XRT5997 device) to operate in the “Clocked” mode by
simply applying a 2.048MHz clock signal to the
“TxClk_x” input pin (where x denotes a given channel
within the XR5997 device). The XRT5997 device
contains some circuitry that sense activity on the
“TxClk_x” line. If this circuit senses activity on the
“TxClk_x” line, then the corresponding channel will
automatically be operating in the “Clocked” Mode.
In the Clocked Mode, the Terminal Equipment is
expected to apply a 2.048MHz clock signal at the
TxClk_x input pin and NRZ data at the TxPOS_x and
TxNEG_x input pins. The “Transmit Input Interface”
circuit will sample the data, at the TxPOS_x and
TxNEG_x input pins, upon the falling edge of TxClk_x,
as illustrated in Figure 3.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT5997ES | 功能描述:其他開發(fā)工具 Eval Board for XRT5997 Series RoHS:否 制造商:Parallax 產(chǎn)品:ELEV-8 Hex Upgrade Kits 類型:Robotics 工具用于評估:ELEV-8 Quadcopter 工作電源電壓: |
| XRT5997IV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCM Transceiver |
| XRT5997IV-F | 功能描述:外圍驅(qū)動器與原件 - PCI 3.3V or 5V 7-ch E1 temp -45 to 85C RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT5997IVTR-F | 功能描述:外圍驅(qū)動器與原件 - PCI 7 Ch. E1 LIU RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT59L81IG-F | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 BITS Clock Generator RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
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