参数资料
型号: XRT75R12DIB-L
厂商: Exar Corporation
文件页数: 65/133页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 12CH 420TBGA
标准包装: 40
类型: 线路接口装置(LIU)
驱动器/接收器数: 12/12
规程: DS3,E3,STS-1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 420-LBGA 裸露焊盘
供应商设备封装: 420-TBGA(35x35)
包装: 托盘
XRT75R12D
33
REV. 1.0.3
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
5.2.2
DIGITAL LOOPBACK
When the Digital Loopback is selected, the transmit clock TxClk_n and transmit data inputs (TxPOS_n &
TxNEG_n are looped back and output onto the RxClk_n, RxPOS_n and RxNEG_n pins as shown in
Figure 19.
5.2.3
REMOTE LOOPBACK
With Remote loopback activated as shown in Figure 20, the receive data on RTIP and RRing is looped back
after the jitter attenuator (if selected in receive or transmit path) to the transmit path using RxClk as transmit
timing. The receive data is also output via the RxPOS and RxNEG pins.
NOTE: Input signals on TxClk, TxPOS and TxNEG are ignored during Remote loopback.
FIGURE 19. DIGITAL LOOPBACK
FIGURE 20. REMOTE LOOPBACK
TRing
TTIP
RRing
RTIP
RxPOS
RxNEG
RxCLK
TxNEG
TxCLK
TxPOS
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
J
IT
T
E
R
A
T
E
N
U
A
T
O
R
J
IT
T
E
R
A
T
E
N
U
A
T
O
R
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
Tx
Rx
TRing
TTIP
RRing
RTIP
RxPOS
RxNEG
RxCLK
TxNEG
TxCLK
TxPOS
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
J
IT
T
E
R
A
T
E
N
U
A
T
O
R
J
IT
T
E
R
A
T
E
N
U
A
T
O
R
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
Tx
Rx
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