參數(shù)資料
型號： XRT75R12IB
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
中文描述： DATACOM, PCM TRANSCEIVER, PBGA420
封裝： 35 X 35 MM, TBGA-420
文件頁數(shù)： 21/89頁
文件大?。?/td> 457K
代理商： XRT75R12IB
PRELIMINARY
XRT75R12
REV. P1.0.2
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
18
FUNCTIONAL DESCRIPTION
The XRT75R12 is a twelve channel fully integrated Line Interface Unit featuring EXAR’s R
3
Technology
(Reconfigurable, Relayless Redundancy) for E3/DS3/STS-1 applications. The LIU incorporates 12
independent Receivers, Transmitters and Jitter Attenuators in a single 420 Lead TBGA package. Each
channel can be independently programmed to support E3, DS-3 or STS-1 line rates using one input clock
reference of 12.288MHz in Single Frequency Mode (SFM). The LIU is responsible for provding the physical
connection between a line interface and an aggregate mapper or framing device. Along with the analog-to-
digital processing, the LIU offers monitoring and diagnostic features to help optimize network design
implementation. A key characteristic within the network topology is Automatic Protection Switching (APS).
EXAR’s proven expertise in providing redundany solutions has paved the way for R
3
Technology.
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 aggregate 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 2. for a simplified
block diagram of a typical redundancy design.
F
IGURE
2. N
ETWORK
R
EDUNDANCY
A
RCHITECTURE
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
相關(guān)PDF資料
PDF描述
XRT75VL00 E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
XRT75VL00IV E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
XRT79L71 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L71IB 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L72 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT75R12IB-F 功能描述:外圍驅(qū)動器與原件 - PCI 12 Channel 3.3V-5V temp -45 to 85C RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT75R12IB-L 功能描述:LIN 收發(fā)器 Attenuator RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8
XRT75VL00 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
XRT75VL00_08 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
XRT75VL00D 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
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