參數資料
型號: XRT75L04IVTR
廠商: Exar Corporation
文件頁數: 48/57頁
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 4CH 176LQFP
標準包裝: 1,000
類型: 線路接口裝置(LIU)
驅動器/接收器數: 4/4
規(guī)程: DS3,E3,STS-1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 176-LQFP
供應商設備封裝: 176-TQFP(24x24)
包裝: 帶卷 (TR)
XRT75L04
50
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
REV. 1.0.4
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 loopback.
FIGURE 26. ANALOG LOOPBACK
FIGURE 27. DIGITAL LOOPBACK
TRING
TTIP
RRING
RTIP
RPOS
RNEG
RCLK
TNDATA
TCLK
TPDATA
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
JI
TTER
2
AT
T
E
NUAT
OR
JI
TTER
2
AT
T
E
NUAT
OR
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
JITTER
2
ATTENUATOR
JITTER
2
ATTENUATOR
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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