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)： 39/78頁
文件大?。?/td> 606K
代理商： XRT83SH38_0609
XRT83SH38
36
REV. 1.0.7
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
5.2
Line Card Redundancy
Telecommunication system design requires signal integrity and reliability. When a T1/E1 primary line card has
a failure, it must be swapped with a backup line card while maintaining connectivity to a backplane without
losing data. System designers can achieve this by implementing common redundancy schemes with the
XRT83SH38 LIU. EXAR offers features that are tailored to redundancy applications while reducing the number
of components and providing system designers with solid reference designs.
RLOS and DMO
If an RLOS or DMO condition occurs, the XRT83SH38 reports the alarm to the individual status registers on a
per channel basis. However, for redundancy applications, an RLOS or DMO alarm can be used to initiate an
automatic switch to the back up card. For this application, two global pins RLOS and DMO are used to indicate
that one of the 8-channels has an RLOS or DMO condition.
Typical Redundancy Schemes
1:1 One backup card for every primary card (Facility Protection)
1+1 One backup card for every primary card (Line Protection)
·N+1 One backup card for N primary cards
5.2.1
1:1 and 1+1 Redundancy Without Relays
The 1:1 facility protection and 1+1 line protection have one backup card for every primary card. When using
1:1 or 1+1 redundancy, the backup card has its transmitters tri-stated and its receivers in high impedance. This
eliminates the need for external relays and provides one bill of materials for all interface modes of operation.
For 1+1 line protection, the receiver inputs on the backup card have the ability to monitor the line for bit errors
while in high impedance. The transmit and receive sections of the LIU device are described separately.
5.2.2
Transmit Interface with 1:1 and 1+1 Redundancy
The transmitters on the backup card should be tri-stated. Select the appropriate impedance for the desired
mode of operation, T1/E1/J1. A 0.68uF capacitor is used in series with TTIP for blocking DC bias. See
Figure 27
. for a simplified block diagram of the transmit section for a 1:1 and 1+1 redundancy.
F
IGURE
27. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
T
RANSMIT
I
NTERFACE
FOR
1:1
AND
1+1 R
EDUNDANCY
T1/E1 Line
Backplane Interface
Primary Card
Backup Card
XRT83SH38
Tx
Tx
0.68uF
0.68uF
Internal Impedence
1:2
1:2
XRT83SH38
Internal Impedence
相關(guān)PDF資料
PDF描述
XRT83SH38IB 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83SL216 16-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
XRT83SL216_06 16-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
XRT83SL216IB 16-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
XRT83SL28 8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT83SH38ES 功能描述:外圍驅(qū)動器與原件 - PCI 8 CHT1/E1LIUSH 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
XRT83SH38IB 功能描述:外圍驅(qū)動器與原件 - PCI 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
XRT83SH38IB-F 功能描述:外圍驅(qū)動器與原件 - PCI 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
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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