參數(shù)資料
型號: XRT75L06DIB
廠商: Exar Corporation
文件頁數(shù): 42/103頁
文件大?。?/td> 0K
描述: IC LIU E3/DS3/STS-1 6CH 217BGA
標準包裝: 60
類型: 線路接口裝置(LIU)
驅(qū)動器/接收器數(shù): 6/6
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: 217-BBGA
供應(yīng)商設(shè)備封裝: 217-BGA(23x23)
包裝: 托盤
xr
XRT75L06D
REV. 1.0.4
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
39
5.2
LOOPBACKS
The XRT75L06D offers three loopback modes for diagnostic purposes. The loopback modes are selected via
the RLB_n and LLB_n bits n the Channel control registers select the loopback modes.
5.2.1
ANALOG LOOPBACK
In this mode, the transmitter outputs TTIP_n and TRing_n are internally connected to the receiver inputs
RTIP_n and RRing_n as shown in Figure 30. Data and clock are output at RxClk_n, RxPOS_n and RxNEG_n
pins for the corresponding transceiver. Analog loopback exercises most of the functional blocks of the device
including the jitter attenuator which can be selected in either the transmit or receive path.
NOTES:
1.
In the Analog loopback mode, data is also output via TTIP_n and TRing_n pins.
2.
Signals on the RTIP_n and RRing_n pins are ignored during analog loopback.
FIGURE 30. ANALOG LOOPBACK
TRing
TTIP
RRing
RTIP
RxPOS
RxNEG
RxClk
TxNEG
TxClk
TxPOS
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
JITTE
R
A
T
E
NU
ATOR
JI
TTER
ATTEN
UATOR
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
Tx
Rx
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