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參數(shù)資料
| 型號： | XRT75L04D |
| 廠商： | Exar Corporation |
| 英文描述： | FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
| 中文描述： | 四通道E3/DS3/STS-1線路接口單元與SONET DESYNCHRONIZER |
| 文件頁數(shù)： | 34/98頁 |
| 文件大?。?/td> | 536K |
| 代理商： | XRT75L04D |
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XRT75L04D
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
á
REV. 1.0.1
30
5.0
This section describes the detailed operation of the various blocks in the receiver. The receiver recovers the
TTL/CMOS level data from the incoming bipolar B3ZS or HDB3 encoded input pulses.
5.1
AGC/Equalizer:
The Adaptive Gain Control circuit amplifies the incoming analog signal and compensates for the various flat
losses and also for the loss at one-half symbol rate. The AGC has a dynamic range of 30 dB.
The Equalizer restores the integrity of the signal and compensates for the frequency dependent attenuation of
up to 900 feet of coaxial cable (1300 feet for E3). The Equalizer also boosts the high frequency content of the
signal to reduce Inter-Symbol Interference (ISI) so that the slicer slices the signal at 50% of peak voltage to
generate Positive and Negative data.
The Equalizer can either be “IN” or “OUT” by setting the REQEN_n pin “High” or “Low” (in Hardware Mode) or
setting the REQEN_n control bit to “1” or “0” (in Host Mode).
R
ECOMMENDATIONS
FOR
E
QUALIZER
S
ETTINGS
:
The Equalizer has two gain settings to provide optimum equalization. In the case of normally shaped DS3/
STS-1 pulses (pulses that meet the template requirements) that has been driven through 0 to 900 feet of cable,
the Equalizer can be left “IN” by setting the REQEN_n pin to “High” (in Hardware Mode) or setting the
REQEN_n control bit to “1” (in Host Mode).
However, for square-shaped pulses such as E3 or for DS3/STS-1 high pulses (that does not meet the pulse
template requirements), it is recommended that the Equalizer be left “OUT” for cable length less than 300 feet
by setting the REQEN_n pin “Low” (in Hardware Mode) or by setting the REQEN_n control bit to “0” (in Host
Mode).This would help to prevent over-equalization of the signal and thus optimize the performance in terms of
better jitter transfer characteristics.
THE RECEIVER SECTION:
N
OTE
: The results of extensive testing indicates that even when the Equalizer was left “IN” (REQEN_n = “HIGH”),
regardless of the cable length, the integrity of the E3 signal was restored properly over 0 to 12 dB cable
loss at Industrial Temperature.
The Equalizer also contain an additional 20 dB gain stage to provide the line monitoring capability of the
resistively attenuated signals which may have 20dB flat loss. This capability can be turned on by writing a “1” to
the RxMON_n bits in the control register or by setting the RxMON pin (pin 69) “High”.
5.1.1
Interference Tolerance:
For E3 mode, ITU-T G.703 Recommendation specifies that the receiver be able to recover error-free clock and
data in the presence of a sinusoidal interfering tone signal. For DS3 and STS-1 modes, the same
recommendation is being used. Figure 17 shows the configuration to test the interference margin for DS3/
STS1. Figure 18 shows the set up for E3.
F
IGURE
17. I
NTERFERENCE
M
ARGIN
T
EST
S
ET
UP
FOR
DS3/STS-1
∑
Test Equipment
Pattern Generator
2
23
-1 PRBS
Sine Wave
Generator
N
S
Cable Simulator
DUT
XRT75L04D
Attenuator
DS3 = 22.368 MHz
STS-1 = 25.92 MHz
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| XRT75L04DIV | FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
| XRT75L04 | FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER |
| XRT75L04IV | FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER |
| XRT75L06D | SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XRT75L04DES | 功能描述:時鐘合成器/抖動清除器 4CH T3/E3/STS1 LIU+DESYNCH 3.3V RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| XRT75L04DIV | 功能描述:外圍驅動器與原件 - PCI 4 CHNL E3/DS3/STS 1 JITTER ATTENUATOR 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 |
| XRT75L04DIV-F | 功能描述:外圍驅動器與原件 - PCI 4-Ch DS3, E3, STS-1 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 |
| XRT75L04DIVTR | 功能描述:時鐘合成器/抖動清除器 4 CHNL E3/DS3/STS 1 JITTER ATTENUATOR RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| XRT75L04DIVTR-F | 功能描述:時鐘合成器/抖動清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
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