參數(shù)資料
型號: 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): 42/84頁
文件大?。?/td> 631K
代理商: XRT83L314IB
XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
card to internal impedance, then the primary card to "High" impedance. See Figure 37. for a simplified block
diagram of the receive section for a 1:1 redundancy scheme.
F
IGURE
37. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
R
ECEIVE
I
NTERFACE
FOR
1:1
AND
1+1 R
EDUNDANCY
38
4.3.4
N+1 redundancy has one backup card for N primary cards. Due to impedance mismatch and signal
contention, external relays are necessary when using this redundancy scheme. The relays create complete
isolation between the primary cards and the backup card. This allows all transmitters and receivers on the
primary cards to be configured in internal impedance, providing one bill of materials for all interface modes of
operation. The transmit and receive sections of the LIU device are described separately.
N+1 Redundancy Using External Relays
"High" Impedence
Internal Impedence
Backplane Interface
Primary Card
Backup Card
XRT83L314
Rx
T1/E1 Line
Rx
1:1
1:1
XRT83L314
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