参数资料
型号: XRT75L02IV-F
厂商: Exar Corporation
文件页数: 40/50页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 2CH 100TQFP
标准包装: 90
类型: 线路接口装置(LIU)
驱动器/接收器数: 2/2
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: 100-LQFP
供应商设备封装: 100-TQFP(14x14)
包装: 托盘
XRT75L02
xr
TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER
REV. 1.0.3
43
8.2.2
DIGITAL LOOPBACK:
The Digital Loopback function is available either in Hardware mode or Host mode. When the Digital Loopback
is selected, the transmit clock (TxClk_n) and transmit data inputs (TPOS_n & TNEG_n) are looped back and
output onto the RxClk_n, RPOS_n and RNEG_n pins as shown in Figure 27. The data presented on TxClk,
TPOS and TNEG are not output on the TTIP and TRING pins.This provides the capability to configure the
protection card (in redundancy applications) in Digital Loopback mode without affecting the traffic on the
primary card.
NOTE: Signals on the RTIP_n and RRING_n pins are ignored during digital loop back.
8.2.3
IREMOTE LOOPBACK:
With Remote loop back activated as shown in Figure 28, 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 RPOS and RNEG pins.
During the remote loop back mode, if the jitter attenuator is selected in the transmit path, the receive data after
the Clock and Data Recovery Block is looped back to the transmit path and passed through the jitter attenuator
using RxClk as the transmit timing.
NOTE: Input signals on TxClk, TPOS and TNEG are ignored during Remote loop back.
FIGURE 26. ANALOG LOOPBACK
FIGURE 27. DIGITAL LOOPBACK
TRING
TTIP
RRING
RTIP
RPOS
RNEG
RCLK
TNDATA
TCLK
TPDATA
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
J
IT
T
E
R
2
A
T
E
N
U
A
T
O
R
J
IT
T
E
R
2
A
T
E
N
U
A
T
O
R
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
1 if enabled
2 if enabled and selected in either Receive or Transmit path
Tx
Rx
1
TRING
TTIP
RRING
RTIP
RPOS
RNEG
RCLK
TNDATA
TCLK
TPDATA
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
J
IT
TE
R
2
A
TT
E
N
U
A
TO
R
J
ITT
E
R
2
A
T
TE
N
U
A
T
O
R
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
1 if enabled
2 if enabled and selected in either Receive or Transmit path
Tx
Rx
1
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