參數(shù)資料
型號： XRT83SH38_0609
廠商： Exar Corporation
英文描述： 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述： 8通道的T1/E1/J1短途線路接口單元
文件頁數(shù)： 27/78頁
文件大?。?/td> 606K
代理商： XRT83SH38_0609
XRT83SH38
24
REV. 1.0.7
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
according to the receiver loss of signal section in this datasheet. The test configuration for measuring the
receive sensitivity is shown in
Figure 10
.
F
IGURE
10. T
EST
C
ONFIGURATION
FOR
M
EASURING
R
ECEIVE
S
ENSITIVITY
3.2.2
Interference Margin
The interference margin for the XRT83SH38 will be added when the first revision of silicon arrives. The test
configuration for measuring the interference margin is shown in
Figure 11
.
F
IGURE
11. T
EST
C
ONFIGURATION
FOR
M
EASURING
I
NTERFERENCE
M
ARGIN
3.2.3
General Alarm Detection and Interrupt Generation
The receive path detects RLOS, AIS, QRPD and FLS. These alarms can be individually masked to prevent the
alarm from triggering an interrupt. To enable interrupt generation, the Global Interrupt Enable (GIE) bit must be
set "High" in the appropriate global register. Any time a change in status occurs (it the alarms are enabled), the
interrupt pin will pull "Low" to indicate an alarm has occurred. Once the status registers have been read, the
INT pin will return "High". The status registers are Reset Upon Read (RUR). The interrupts are categorized in
a hierarchical process block.
Figure
is a simplified block diagram of the interrupt generation process.
N
OTE
:
The interrupt pin is an open-drain output that requires a 10k
external pull-up resistor.
3.2.3.1
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 XRT83SH38 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 equalizer 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 12
is a simplified block diagram of the analog
RLOS function.
Table 6
summarizes the analog RLOS values for the different equalizer gain settings.
Network
Analyzer
E1 = PRBS 2
15
- 1
T1 = PRBS 2
23
- 1
External Loopback
XRT83SH38
14-Channel
Long Haul LIU
Cable Loss
Flat Loss
Tx
Tx
Rx
Rx
W&G ANT20
Sinewave
Generator
Flat Loss
W&G ANT20
Network
Analyzer
Cable Loss
XRT83SH38
14-Channel LIU
E1 = 1,024kHz
T1 = 772kHz
E1 = PRBS 2
15
- 1
T1 = PRBS 2
23
- 1
Tx
Tx
Rx
Rx
External Loopback
相關(guān)PDF資料
PDF描述
XRT83SH38IB 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
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XRT83SL216IB 16-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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XRT83SL216 制造商:EXAR 制造商全稱:EXAR 功能描述:16-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
XRT83SL216_06 制造商:EXAR 制造商全稱:EXAR 功能描述:16-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
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