参数资料
| 型号： | XRT73LC03AIV |
| 厂商： | Exar Corporation |
| 文件页数： | 29/61页 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 3CH 120LQFP |
| 标准包装： | 72 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 3/3 |
| 规程： | DS3，E3，STS-1 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 120-LQFP |
| 供应商设备封装： | 120-LQFP（14x20） |
| 包装： | 托盘 |
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XRT73LC03A
33
REV. 1.0.4
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
Set the TxLEV_(n) bit-field to "1" as illustrated below.
2.4.3
Design Guideline for Setting the Transmit
Line Build-Out Circuit
The TxLEV_(n) input pins or bit-fields should be set
based upon the overall cable length between the
Transmitting Terminal and the Digital Cross Connect
system where the pulse template measurements are
made.
If the cable length between the Transmitting Ter-
minal and the DSX-3 or STSX-1 is less than 225
feet, enable the Transmit Line Build-Out circuit by
setting the TxLEV_(n) input pin or bit-field to "0".
NOTE: In this case, the configured channel outputs shaped
(e.g., not square-wave) pulses onto the line via its TTIP_(n)
and TRing_(n) output pins. The shape of this output pulse
is such that it complies with the pulse template require-
ments even when subjected to cable loss ranging from 0 to
225 feet.
If the cable length between the Transmitting Ter-
minal and the DSX-3 or STSX-1 is greater than 225
feet, disable the Transmit Line Build-Out circuit
by setting the TxLEV_(n) input pin or bit-field to
"1".
NOTE: In this case, the configured channel outputs partially
shaped pulses onto the line via the TTIP_(n) and TRing_(n)
output pins. The cable loss that these pulses experience
over long cable lengths (e.g., greater than 225 feet) cause
these pulses to be properly shaped and comply with the
appropriate pulse template requirement.
2.4.4
The Transmit Line Build-Out Circuit and
E3 Applications
The ITU-T G.703 Pulse Template Requirements for
E3 states that the E3 transmit output pulse should be
measured at the Secondary Side of the Transmit Out-
put Transformer for Pulse Template compliance. In
other words, there is no Digital Cross Connect Sys-
tem pulse template requirement for E3. Consequent-
ly, the Transmit Line Build-Out circuit within a given
Channel is disabled whenever that channel has been
configured to operate in the E3 Mode.
2.5
INTERFACING THE TRANSMIT SECTIONS OF THE
XRT73LC03A TO THE LINE
The E3, DS3 and SONET STS-1 specification docu-
ments all state that line signals transmitted over coax-
ial cable are to be terminated with 75 Ohm resistor.
Interface the Transmit Section of the XRT73LC03A
in the manner illustrated in Figure 21.
COMMAND REGISTER, CR1-(n)
D4
D3
D2
D1
D0
TxOFF_(n)
TAOS_(n)
TxClkINV_(n)
TxLEV_(n)
TxBIN_(n)
0X
X
1X
FIGURE 21. RECOMMENDED SCHEMATIC FOR INTERFACING THE TRANSMIT SECTION OF THE XRT73LC03A
TO THE
LINE
R1
31.6
R2
31.6
Channel (n)
TxPOS_(n)
TxNEG_(n)
TxLineClk_(n)
TTIP_(n)
TRing_(n)
TPData_(n)
TNData_(n)
TxClk_(n)
Only One Channel Shown
1:1
J1
BNC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT73LC03AIVF | 制造商:Exar Corporation 功能描述:Line Interface Unit 51.84Mbps DS3/E3/STS-1 Serial 120-Pin LQFP |
| XRT73LC03AIV-F | 功能描述:外围驱动器与原件 - PCI 3-Ch DS3, E3, STS-1 RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| XRT73LC04A | 制造商:EXAR 制造商全称:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73LC04A_08 | 制造商:EXAR 制造商全称:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73LC04AES | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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