參數(shù)資料
型號(hào): XRT83VSH316IB
廠(chǎng)商: EXAR CORP
元件分類(lèi): 數(shù)字傳輸電路
英文描述: 16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA316
封裝: 21 X 21 MM, STBGA-316
文件頁(yè)數(shù): 40/96頁(yè)
文件大小: 600K
代理商: XRT83VSH316IB
XRT83VSH316
PRELIMINARY
38
16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. P1.0.3
5.0
T1/E1 APPLICATIONS
This application section describes common T1/E1 system considerations along with the various loop back
modes available in the LIU.
5.1
Loopback Diagnostics
The XRT83VSH316 supports several loopback modes for diagnostic testing. The following section describes
the local analog loopback, remote loopback, digital loopback, and dual loopback modes.
5.1.1
Local Analog Loopback
With local analog loopback activated, the transmit output data at TTip/TRing is internally looped back to the
analog inputs at RTip/RRing. External inputs at RTip/RRing are ignored while valid transmit output data
continues to be sent to the line. A simplified block diagram of local analog loopback is shown in
Figure 23
.
F
IGURE
23. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
L
OCAL
A
NALOG
L
OOPBACK
B8ZS/HDB3
Decoder
32-bit/64-bit
Jitter Attenuator
Clock & Data
Recovery (CDR)
Peak Detector
& Slicer
System Generator
SAIS, SLOS, SPRBS
Line Detector
AIS, RLOS, PRBS,
LCV
RNEG/LCV
RPOS
RCLK
B8ZS/HDB3
Encoder
32-bit/64-bit
Jitter Attenuator
Timing
Control
Tx Pulse Shaper
Line Driver
Analog
Loop Back
MUX
DMO
System Detector
SAIS, SLOS, SPRBS
Line Generator
PRBS
TPOS
TNEG
TCLK
TTIP
TRING
AIS
Channel N of 16
DMO
SLOS
TxON
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