参数资料
型号: XRT75L00DIV-F
厂商: Exar Corporation
文件页数: 29/92页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 SGL 52TQFP
标准包装: 96
类型: 线路接口装置(LIU)
驱动器/接收器数: 1/1
规程: DS3,E3,STS-1,SONET
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 52-LQFP
供应商设备封装: 52-TQFP(10x10)
包装: 托盘
XRT75L00D
REV. 1.0.2
E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
30
The decoder block takes the output from clock and data recovery block and decodes the B3ZS (for DS3 or
STS-1) or HDB3 (for E3) encoded line signal and detects any coding errors or excessive zeros in the data
stream.
Whenever the input signal violates the B3ZS or HDB3 coding sequence for bipolar violation or contains three
(for B3ZS) or four (for HDB3) or more consecutive zeros, an active “High” pulse is generated on the RLCV
output pins to indicate line code violation.
NOTE: In Single- Rail (NRZ) mode, the decoder is bypassed.
5.4
LOS (Loss of Signal) Detector:
5.4.1
DS3/STS-1 LOS Condition:
A Digital Loss of Signal (DLOS) condition occurs when a string of 175 ± 75 consecutive zeros occur on the line.
When the DLOS condition occurs, the DLOS bit is set to “1” in the status control register. DLOS condition is
cleared when the detected average pulse density is greater than 33% for 175 ± 75 pulses.
Analog Loss of Signal (ALOS) condition occurs when the amplitude of the incoming line signal is below the
threshold as shown in the Table 10.The status of the ALOS condition is reflected in the ALOS status control
register.
RLOS is the logical OR of the DLOS and ALOS states. When the RLOS condition occurs the RLOS output pin
is toggled “High” and the RLOS bit is set to “1” in the status control register.
DISABLING ALOS/DLOS DETECTOR:
For debugging purposes it is useful to disable the ALOS/DLOS detector. Writing a “1” to the ALOS and DLOS
bits disables the LOS detector on a per channel basis.
5.4.2
E3 LOS Condition:
If the level of incoming line signal drops below the threshold as described in the ITU-T G.775 standard, the
LOS condition is detected. Loss of signal level is defined to be between 15 and 35 dB below the normal level.
If the signal drops below 35 dB for 175 ± 75 consecutive pulse periods, LOS condition is declared. This is
illustrated in Figure 19.
TABLE 10: THE ALOS (ANALOG LOS) DECLARATION AND CLEARANCE THRESHOLDS FOR A GIVEN SETTING OF
REQEN (DS3 AND STS-1 APPLICATIONS)
APPLICATION
REQEN SETTING
SIGNAL LEVEL TO DECLARE ALOS
SIGNAL LEVEL TO CLEAR ALOS
DS3
1<20mV
>90mV
STS-1
1<25mV
>115mV
相关PDF资料
PDF描述
XRT75L00IV-F IC LIU E3/DS3/STS-1 SGL 52TQFP
XRT75L02DIV-F IC LIU E3/DS3/STS-1 2CH 100TQFP
XRT75L03DIV-F IC LIU E3/DS3/STS-1 3CH 128LQFP
XRT75L03IV-F IC LIU E3/DS3/STS-1 3CH 128LQFP
XRT75L04DIV-F IC LIU E3/DS3/STS-1 4CH 176TQFP
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