參數(shù)資料
型號: XRT83SL34
廠商: Exar Corporation
英文描述: QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
中文描述: 上海四的T1/E1/J1收發(fā)器時鐘恢復(fù)和抖動衰減器
文件頁數(shù): 36/80頁
文件大?。?/td> 856K
代理商: XRT83SL34
XRT83SL34
QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PRELIMINARY
REV. P1.0.8
38
LOCAL ANALOG LOOP-BACK (ALOOP)
With Local Analog Loop-Back activated, the transmit data at TTIP and TRING are looped-back to the analog
input of the receiver. External inputs at RTIP/RRING in this mode are ignored while valid transmit data
continues to be sent to the line. Local Analog Loop-Back exercises most of the functional blocks of the
XRT83SL34 including the jitter attenuator which can be selected in either the transmit or receive paths. Local
Analog Loop-Back is shown in Figure 18.
In this mode, the jitter attenuator (if selected) can be placed in the transmit or receive path.
REMOTE LOOP-BACK (RLOOP)
With Remote Loop-Back activated, receive data after the jitter attenuator (if selected in the receive path) is
looped back to the transmit path using RCLK as transmit timing. In this mode transmit clock and data are
ignored, while RCLK and receive data will continue to be available at their respective output pins. Remote
Loop-Back with jitter attenuator selected in the receive path is shown in Figure 19.
FIGURE 18. LOCAL ANALOG LOOP-BACK SIGNAL FLOW
FIGURE 19. REMOTE LOOP-BACK MODE WITH JITTER ATTENUATOR SELECTED IN RECEIVE PATH
Rx
Data &
Clock
Recovery
Decoder
TPOS
TNEG
TCLK
RCLK
RPOS
RNEG
Tx
Encoder
Timing
Control
JA
TTIP
TRING
RTIP
RRING
Tx
Decoder
Timing
Control
Rx
Data &
Clock
Recovery
TPOS
TNEG
TCLK
RCLK
RPOS
RNEG
Encoder
TTIP
TRING
RTIP
RRING
JA
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