參數(shù)資料
型號: XRT75R12DIB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
中文描述: DATACOM, PCM TRANSCEIVER, PBGA420
封裝: 35 X 35 MM, TBGA-420
文件頁數(shù): 48/131頁
文件大?。?/td> 717K
代理商: XRT75R12DIB
XRT75R12D
REV. P1.0.1
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
PRELIMINARY
43
6.2.2
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 31.
DIGITAL LOOPBACK
6.2.3
With Remote loopback activated as shown in Figure 32, 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.
N
OTE
:
Input signals on TxClk, TxPOS and TxNEG are ignored during Remote loopback.
REMOTE LOOPBACK
F
IGURE
31. D
IGITAL
L
OOPBACK
F
IGURE
32. R
EMOTE
L
OOPBACK
TRing
TTIP
RRing
RTIP
RxPOS
RxNEG
RxCLK
TxNEG
TxCLK
TxPOS
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
J
A
J
A
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
Tx
Rx
TRing
TTIP
RRing
RTIP
RxPOS
RxNEG
RxCLK
TxNEG
TxCLK
TxPOS
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
J
A
J
A
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
Tx
Rx
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