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| 型号： | IDT82P2828BHG |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 81/154页 |
| 文件大小： | 0K |
| 描述： | IC LIU T1/J1/E1 28+1CH 640-PBGA |
| 标准包装： | 5 |
| 类型： | 线路接口装置（LIU） |
| 规程： | E1 |
| 电源电压： | 3.13 V ~ 3.47 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 640-BGA 裸露焊盘 |
| 供应商设备封装： | 640-PBGA-EP（31x31） |
| 包装： | 托盘 |
| 其它名称： | 82P2828BHG |
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IDT82P2828
28(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Functional Description
32
February 6, 2009
3.2.2
EQUALIZER
The equalizer compensates high frequency attenuation to enhance
receive sensitivity.
3.2.2.1 Line Monitor
In both T1/J1 and E1 short haul applications, the Protected Non-
Intrusive Monitoring per T1.102 can be performed between two devices.
The monitored channel of one device is in normal operation, and the
monitoring channel of the other device taps the monitored one through a
high impedance bridging circuit (refer to Figure-13 and Figure-14).
After the high resistance bridging circuit, the signal arriving at RTIPn/
RRINGn of the monitoring channel is dramatically attenuated. To
compensate this bridge resistive attenuation, Monitor Gain can be used
to boost the signal by 20 dB, 26 dB or 32 dB, as selected by the MG[1:0]
bits (b1~0, RCF2,...). For normal operation, the Monitor Gain should be
set to 0 dB, i.e., the Monitor Gain of the monitored channel should be 0
dB.
The monitoring channel can be configured to any of the External,
Partially Internal or Fully Internal Impedance Matching mode. Here the
external r or internal IM is used for voltage division, not for impedance
matching. That is, the r (IM) and the two R make up of a resistance
bridge. The resistive attenuation of this bridge is 20lg(r/(2R+r)) dB.
Note that line monitor is only available in differential line interface.
A channel 0 monitoring function is provided (refer to Section 3.5.9
Channel 0 Monitoring). If multiple High-Density LIUs are used in an
application, The G.772 function of channel 0 can be used to route the
signals of channel 1~28 Receive and Transmit to channel 0 of the same
device. This channel 0 Transmit TTIP and TTRING could then be moni-
tored by another device through the Line Monitor function.
3.2.2.2 Receive Sensitivity
The receive sensitivity is the minimum range of receive signal level
for which the receiver recovers data error-free with -18 dB interference
signal added.
For Receive Differential line interface, the receive sensitivity is -15
dB.
For Receive Single Ended line interface, the receive sensitivity is -12
dB.
Figure-13 Receive Path Monitoring
Figure-14 Transmit Path Monitoring
RTIPn
RRINGn
RTIPn
RRINGn
monitored channel
monitoring channel
DSX cross
connect point
R
monitor gain
= 20/26/32 dB
monitor gain
= 0 dB
R
r
TTIPn
TRINGn
RTIPn
RRINGn
monitored channel
monitoring channel
DSX cross
connect point
R
monitor gain
= 20/26/32 dB
monitor gain
= 0 dB
R
r
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相关代理商/技术参数 |
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| IDT82P2916 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:16-Channel High-Density T1/E1/J1 Line Interface Unit |
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