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| 型号： | XRT7300IV-F |
| 厂商： | Exar Corporation |
| 文件页数： | 25/55页 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 SGL 44TQFP |
| 标准包装： | 160 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 1/1 |
| 规程： | DS3，E3，STS-1 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LQFP |
| 供应商设备封装： | 44-TQFP（10x10） |
| 包装： | 托盘 |
| 其它名称： | 1016-1635 XRT7300IV-F-ND |
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XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
27
that the transmitted data and clock can be recovered
reliably.
The Use of the Receive Equalizer in a Typical DS3
or STS-1 Application
Most System Manufacturers of equipment supporting
DS3 and STS-1 lines interface their equipment to a
Digital Cross-Connect System. While installing their
equipment, the Transmit Line Build-Out circuit is set
to the proper setting that makes the transmit output
pulse compliant with the Isolated DSX-3 or STSX-1
Pulse Template requirements. For the XRT7300 this
is achieved by setting the TXLEV input pin or bit-field
to the appropriate level.
When the System Manufacturer is interfacing the Re-
ceive Section of the XRT7300 to the Digital Cross-
Connect system, they should keep aware of the fol-
lowing facts:
1. By definition, all DS3 or STS-1 line signals that
are present at the Digital Cross-Connect system
are required to meet the Isolated Pulse Template
Requirements per Bellcore GR-499-CORE for
DS3 applications or Bellcore GR-253-CORE for
STS-1 applications.
2. Further, these Bellcore documents state that the
amplitude of these pulses at the DSX-3 or STSX-
1 can range in amplitude from 360mVpk to
850mVpk.
3. Finally, these Bellcore documents stipulate that
the Receiving Terminal must be able to receive
this pulse-template compliant line signal over a
cable length of 0 to 450 feet from the Digital
Cross Connect system.
These facts are reflected in Figure 18.
Design Considerations for DS3 and STS-1 Appli-
cations
When installing equipment into environments as de-
picted in Figure 15, it is recommended that the Re-
ceive Equalizer be enabled by setting the REQDIS in-
put pin or bit-field to "0". In fact, the only time that the
Receive Equalizer should be disabled is when there
is an off-chip equalizer in the Receive path between
the Digital Cross-Connect system and the RTIP/
RRING input pins or, in applications where the Re-
ceiver is monitoring the transmit output signal directly.
FIGURE 18. THE TYPICAL APPLICATION FOR THE SYSTEM INSTALLER
DSX-3
or
STSX-1
Digital Cross-
Connect System
Transmitting
Terminal
Receiving
Terminal
0 to 450 feet of
Cable
Pulses that are
compliant to the
Isolated DSX-3 or
STSX-1 Pulse
Template
Requirement
0 to 450 feet of
Cable
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT7300IVTR | 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 |
| XRT7300IVTR-F | 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 |
| XRT7302IV | 制造商:未知厂家 制造商全称:未知厂家 功能描述:PCM Transceiver |
| XRT73L00 | 制造商:EXAR 制造商全称:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00A | 制造商:EXAR 制造商全称:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
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