參數(shù)資料
型號(hào): XRT83SH38IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA225
封裝: 19 X 19 MM, 1 MM PITCH, PLASTIC, BGA-225
文件頁數(shù): 38/78頁
文件大小: 606K
代理商: XRT83SH38IB
XRT83SH38
35
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.7
5.1.3
Digital Loopback
With digital loopback activated, the transmit input data at TCLK/TPOS/TNEG is looped back to the receive
output data at RCLK/RPOS/RNEG. The digital loopback mode includes the Transmit JA (if enabled). The
receive input data at RTIP/RRING is ignored while valid transmit output data continues to be sent to the line. A
simplified block diagram of digital loopback is shown in
Figure 25
.
F
IGURE
25. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
D
IGITAL
L
OOPBACK
5.1.4
Dual Loopback
With dual loopback activated, the remote loopback is combined with the digital loopback. A simplified block
diagram of dual loopback is shown in
Figure 26
.
F
IGURE
26. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
D
UAL
L
OOPBACK
Encoder
Decoder
Timing
Control
Data and
Clock
Recovery
JA
JA
Tx
Rx
TAOS
QRSS
TTIP
TRING
RTIP
RRING
TCLK
TPOS
TNEG
RCLK
RPOS
RNEG
Encoder
Decoder
Timing
Control
Data and
Clock
Recovery
JA
JA
Tx
Rx
TAOS
QRSS
TTIP
TRING
RTIP
RRING
TCLK
TPOS
TNEG
RCLK
RPOS
RNEG
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