参数资料
| 型号： | XRT7300IVTR |
| 厂商： | Exar Corporation |
| 文件页数： | 30/55页 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 SGL 44TQFP |
| 标准包装： | 1,000 |
| 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： | 带卷 (TR) |
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XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
32
3.6.2
The LOS Declaration/Clearance Criteria
for DS3 and STS-1 Applications
When the XRT7300 is operating in the DS3 or STS-1
Modes it declares and clears LOS based on either:
Analog LOS (ALOS) Declaration/Clearance Criteria
or,
Digital LOS (DLOS) Declaration/Clearance Criteria
In the DS3 or STS-1 Modes the LOS output (RLOS)
is simply the logical OR of the ALOS and DLOS
states.
1. The Analog LOS (ALOS) Declaration/Clear-
ance Criteria
The XRT7300 declares an Analog LOS (ALOS) Con-
dition if the amplitude of the incoming line signal
drops below a specific amplitude as defined by the
state of the LOSTHR input pin.
Declaring ALOS
The XRT7300 declares an ALOS (Analog LOS) con-
dition whenever the amplitude of the input signal falls
below the Signal Level to Declare ALOS levels speci-
fied in Table 4.
Clearing ALOS
The XRT7300 clears ALOS whenever the amplitude
of the input signal rises above the Signal Level to
Clear ALOS levels specified in Table 4.
NOTE: There is approximately a 2dB hysteresis in the
received signal level that exists between declaring and
clearing ALOS in order to prevent chattering in the RLOS
output signal.
Monitoring the State of ALOS
If the XRT7300 is operating in the HOST Mode, the
state of ALOS can be polled or monitored by reading
in the contents of Command Register 0. The bit-for-
mat of Command Register 0 is presented below.
If the ALOS bit-field contains a “1”, the XRT7300 is
currently declaring an ALOS condition. If the ALOS
bit-field contains a “0”, the device is NOT currently
declaring an ALOS condition.
Disabling the ALOS Detector
It is useful to disable the ALOS Detector in the
XRT7300 for debugging purposes. If the XRT7300 is
operating in the HOST Mode, the ALOS Detector can
TABLE 4: THE ALOS DECLARATION AND CLEARANCE THRESHOLDS FOR A GIVEN SETTING OF LOSTHR (DS3 AND
STS-1 APPLICATIONS) FOR EQUALIZER ENABLED OR DISABLED
APPLICATION
LOSTHR SETTING
SIGNAL LEVEL TO DECLARE
ALOS
SIGNAL LEVEL TO CLEAR
ALOS
LOS LEVEL WITH EQUALIZER ENABLED
DS3
0
< 55mV
> 220mV
1
< 22mV
> 70mV
Sonet STS-1
0
< 75mV
> 270mV
1
< 25mV
> 110mV
LOS LEVEL WITH EQUALIZER DISABLED
DS3
0
< 35mV
> 155mV
1
< 17mV
> 70mV
Sonet STS-1
0
< 55mV
> 210mV
1
< 20mV
> 90mV
COMMAND REGISTER CR0 (ADDRESS = 0X00)
D4
D3
D2
D1
D0
RLOL
RLOS
ALOS
DLOS
DMO
Read
Only
Read
Only
Read
Only
Read
Only
Read
Only
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| XRT73L00AES | 功能描述:界面开发工具 Eval System for XRT73L00A Series RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
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