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參數(shù)資料
| 型號： | XRT75R03DIV |
| 廠商： | EXAR CORP |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER |
| 中文描述： | DATACOM, PCM TRANSCEIVER, PQFP128 |
| 封裝： | 14 X 20 MM, LQFP-128 |
| 文件頁數(shù)： | 35/134頁 |
| 文件大小： | 803K |
| 代理商： | XRT75R03DIV |
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XRT75R03D
REV. 1.0.2
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER
30
1.0
R
3
TECHNOLOGY (RECONFIGURABLE, RELAYLESS REDUNDANCY)
Redundancy is used to introduce reliability and protection into network card design. The redundant card in
many cases is an exact replicate of the primary card, such that when a failure occurs the network processor
can automatically switch to the backup card. EXAR’s R
3
technology has re-defined E3/DS-3/STS-1 LIU design
for 1:1 and 1+1 redundancy applications. Without relays and one Bill of Materials, EXAR offers multi-port,
integrated LIU solutions to assist high density agregate applications and framing requirements with reliability.
The following section can be used as a reference for implementing R
3
Technology with EXAR’s world leading
line interface units.
1.1
Network Architecture
A common network design that supports 1:1 or 1+1 redundancy consists of N primary cards along with N
backup cards that connect into a mid-plane or back-plane architecture without transformers installed on the
network cards. In addition to the network cards, the design has a line interface card with one source of
transformers, connectors, and protection components that are common to both network cards. Wtih this
design, the bill of materials is reduced to the fewest amount of components. See Figure 3 for a simplified block
diagram of a typical redundancy design.
F
IGURE
3. N
ETWORK
R
EDUNDANCY
A
RCHITECTURE
1.2
EXAR’s "High" impedance circuits protect the LIU and preserve the line impedance characteristics when a
power failure occurs. As the power supply decreases to a pre-determined voltage, the I/O pads are
automatically switched to "High" impedance. This effectively removes the LIU, preventing a line impedance
mismatch or system degradation. Power failures or network card hot swapping change the network circuit. It
is critical that under these circumstances, that the primary card still behaves according to network standards.
The three sensitive specifications are pulse mask conformance, receive sensitivity and return loss. Each must
be carefully characterized to ensure network integrity and reliability.
1.3
Software vs Hardware Automatic Protection Switching
The implementation of R
3
technology can be controlled through programming the internal registers or through
the use of the TxON hardware pin available within the LIU. To use software to tri-state the transmitters, first the
TxON pin must be pulled "High". Once the pin is pulled "High", the individual register bits can be used to
control the output activity of the transmit path. To use the TxON pin, the individual register bits can be set
"High", and the control of the transmitters is handled by setting the state of the TxON pin.
Power Failure Protection
Line Interface Card
Primary Line Card
Framer/
Mapper
LIU
Back
Plane
or
Mid
Plane
Tx
Rx
31.6
31.6
0.01
μ
F
0.01
μ
F
1:1
1:1
Redundant Line Card
Framer/
Mapper
LIU
Tx
Rx
31.6
31.6
0.01
μ
F
0.01
μ
F
37.5
37.5
GND
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PDF描述 |
|---|---|
| XRT75R03 | THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
| XRT75R03IV | THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
| XRT75R06D | SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
| XRT75R06DIB | SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
| XRT75R06 | SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XRT75R03DIV-F | 功能描述:網(wǎng)絡控制器與處理器 IC 3-Ch E3/DS3/STS-1 RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| XRT75R03DIVTR | 功能描述:時鐘合成器/抖動清除器 3CHNNEL 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 |
| XRT75R03DIVTR-F | 功能描述:接口 - 專用 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| XRT75R03ES | 功能描述:時鐘合成器/抖動清除器 3CH T3/E3/STS1LIU+JA 3.3V W/REDUNDANCY 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 |
| XRT75R03IV | 功能描述:外圍驅(qū)動器與原件 - PCI 3CHNNEL 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 |
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