參數(shù)資料
型號： XRT83SH314IB-F
廠商： Exar Corporation
文件頁數(shù)： 21/101頁
文件大?。?/td> 0K
描述： IC LIU T1/E1/J1 14CH 304TBGA
標準包裝： 27
類型： 線路接口裝置（LIU）
驅(qū)動器/接收器數(shù)： 14/14
規(guī)程： T1，E1，J1
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 304-BBGA
供應商設(shè)備封裝： 304-PBGA（31x31）
包裝： 托盤
XRT83SH314
22
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.4
2.2.3.1
RLOS (Receiver Loss of Signal)
In T1 mode, RLOS is declared if an incoming signal has no transitions over a period of 175 +/-75 contiguous
pulse intervals. However, the XRT83SH314 LIU has a built in analog RLOS so that the user can be notified
when the amplitude of the incoming signal has been attenuated -9dB below the equalizer gain setting. For
example: In T1 or E1 short haul mode, the gain setting is 15dB. Once the input reaches an amplitude of -24dB
below nominal, the LIU will declare RLOS. The RLOS circuitry clears when the input reaches +3dB relative to
where it was declared. This +3dB value is a pre-determined hysteresis so that transients will not cause the
RLOS to clear. In E1 mode, RLOS is declared if an incoming signal has no transitions for N consecutive pulse
intervals, where 10
≤N≤255. According to G.775, no transitions in E1 mode is defined between -9dB and -35dB
below nominal. Figure 11 is a simplified block diagram of the analog RLOS function. Table 5 summarizes the
analog RLOS values for the different equalizer gain settings.
FIGURE 11. ANALOG RECEIVE LOS OF SIGNAL FOR T1/E1/J1
NOTE: For programming the equalizer gain setting on a per channel basis, see the microprocessor register map for details.
2.2.3.2
EXLOS (Extended Loss of Signal)
By enabling the extended loss of signal by programming the appropriate channel register, the digital RLOS is
extended to count 4,096 consecutive zeros before declaring RLOS in T1 and E1 mode. By default, EXLOS is
disabled and RLOS operates in normal mode.
2.2.3.3
AIS (Alarm Indication Signal)
The XRT83SH314 adheres to the ITU-T G.775 specification for an all ones pattern. The alarm indication signal
is set to "1" if an all ones pattern (at least 99.9% ones density) is present for T, where T is 3ms to 75ms in T1
mode. AIS will clear when the ones density is not met within the same time period T. In E1 mode, the AIS is
set to "1" if the incoming signal has 2 or less zeros in a 512-bit window. AIS will clear when the incoming signal
has 3 or more zeros in the 512-bit window.
TABLE 5: ANALOG RLOS DECLARE/CLEAR (TYPICAL VALUES) FOR T1/E1
GAIN SETTING
DECLARE
CLEAR
15dB (Short Haul Mode)
-24dB
-21dB
29dB (Monitoring Gain Mode)
-38dB
-35dB
Normalized up to EQC[4:0] Setting
Declare LOS
Clear LOS
-9dB
+3dB
Clear LOS
Declare LOS
+3dB
-9dB
Normalized up to EQC[4:0] Setting
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT83SH314IB-SAK 制造商:Exar Corporation 功能描述:14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT 制造商:EXAR 功能描述:14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83SH38 制造商:EXAR 制造商全稱:EXAR 功能描述:8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83SH38_0609 制造商:EXAR 制造商全稱:EXAR 功能描述:8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83SH38ES 功能描述:外圍驅(qū)動器與原件 - PCI 8 CHT1/E1LIUSH RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT83SH38IB 功能描述:外圍驅(qū)動器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
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