參數(shù)資料
型號： XRT83VSH314IB
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述： DATACOM, PCM TRANSCEIVER, PBGA304
封裝： 31 X 31 MM, 1.27 MM PITCH, PLASTIC, BGA-304
文件頁數(shù)： 37/80頁
文件大?。?/td> 497K
代理商： XRT83VSH314IB
XRT83VSH314
34
REV. 1.0.1
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
5.3
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
XRT83VSH314 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 XRT83VSH314 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 14-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
5.3.1
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.
5.3.2
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 25
. for a simplified block diagram of the transmit section for a 1:1 and 1+1 redundancy.
F
IGURE
25. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
T
RANSMIT
I
NTERFACE
FOR
1:1
AND
1+1 R
EDUNDANCY
Line Card Redundancy
5.3.3
The receivers on the backup card should be programmed for "High" impedance. Since there is no external
resistor in the circuit, the receivers on the backup card will not load down the line interface. This key design
feature eliminates the need for relays and provides one bill of materials for all interface modes of operation.
Receive Interface with 1:1 and 1+1 Redundancy
T1/E1 Line
Backplane Interface
Primary Card
Backup Card
XRT83VSH314
Tx
Tx
0.68uF
0.68uF
Internal Impedence
1:2
1:2
XRT83VSH314
Internal Impedence
相關PDF資料
PDF描述
XRT83VSH316 16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH316IB 16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH38 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH38IB 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT84L14 Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
相關代理商/技術參數(shù)
參數(shù)描述
XRT83VSH314IB-F 功能描述:外圍驅動器與原件 - PCI 14 Channel Short-Haul 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
XRT83VSH314IB-SAM 制造商:Exar Corporation 功能描述:FOR FUJITSU ONLY
XRT83VSH316 制造商:EXAR 制造商全稱:EXAR 功能描述:16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH316_07 制造商:EXAR 制造商全稱:EXAR 功能描述:16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH316ES 功能描述:外圍驅動器與原件 - PCI 16 CH T1/E1LIUSH LOW COST VERSION 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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