參數(shù)資料
型號(hào)： XRT75R12
廠商： Exar Corporation
英文描述： TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
中文描述： 第十二章通道E3/DS3/STS-1線路接口單元與抖動(dòng)衰減器
文件頁(yè)數(shù)： 21/89頁(yè)
文件大?。?/td> 457K
代理商： XRT75R12
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
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