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參數(shù)資料
| 型號(hào)： | XRT83L314IB |
| 廠商： | EXAR CORP |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT |
| 中文描述： | DATACOM, PCM TRANSCEIVER, PBGA304 |
| 封裝： | TBGA-304 |
| 文件頁數(shù)： | 41/84頁 |
| 文件大?。?/td> | 631K |
| 代理商： | XRT83L314IB |
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XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
37
4.3
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
XRT83L314 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 XRT83L314 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
4.3.1
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.
4.3.2
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 36. for a simplified block diagram of the transmit section for a 1:1 and 1+1 redundancy.
F
IGURE
36. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
T
RANSMIT
I
NTERFACE
FOR
1:1
AND
1+1 R
EDUNDANCY
Line Card Redundancy
4.3.3
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.
Select the impedance for the desired mode of operation, T1/E1/J1. To swap the primary card, set the backup
Receive Interface with 1:1 and 1+1 Redundancy
T1/E1 Line
Backplane Interface
Primary Card
Backup Card
XRT83L314
Tx
Tx
0.68uF
0.68uF
Internal Impedence
1:2
1:2
XRT83L314
Internal Impedence
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XRT83L34 | QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR |
| XRT83L34IV | QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR |
| XRT83SH314 | 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT |
| XRT83SH314_0610 | 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT |
| XRT83SH314IB | 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT83L314IB-F | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 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 |
| XRT83L314IB-L | 功能描述:LIN 收發(fā)器 14 channel, LH/SH T1/E1 LIU 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 |
| XRT83L34 | 制造商:EXAR 制造商全稱:EXAR 功能描述:QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR |
| XRT83L34_05 | 制造商:EXAR 制造商全稱:EXAR 功能描述:QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR |
| XRT83L34ES | 功能描述:外圍驅(qū)動(dòng)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 |
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