參數(shù)資料
型號: XRT83VSH38IB
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): 26/76頁
文件大?。?/td> 722K
代理商: XRT83VSH38IB
XRT83VSH38
23
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.7
To meet short haul requirements, the XRT83VSH38 can accept T1/E1/J1 signals that have been attenuated by
12dB of flat loss in E1 mode or by 655 feet of cable loss along with 6dB of flat loss in T1 mode. However, the
XRT83VSH38 can tolerate cable loss and flat loss beyond the industry specifications. The receive sensitivity
in the short haul mode is approximately 4,000 feet without experiencing bit errors, LOF, pattern
synchronization, etc. Although data integrity is maintained, the RLOS function (if enabled) will report an RLOS
condition according to the receiver loss of signal section in this datasheet. The test configuration for
measuring the receive sensitivity is shown in
Figure 10
.
F
IGURE
10. T
EST
C
ONFIGURATION
FOR
M
EASURING
R
ECEIVE
S
ENSITIVITY
3.2.2
Interference Margin
The interference margin for the XRT83VSH38 is -15db. The test configuration for measuring the interference
margin is shown in
Figure 11
.
F
IGURE
11. T
EST
C
ONFIGURATION
FOR
M
EASURING
I
NTERFERENCE
M
ARGIN
3.2.3
General Alarm Detection and Interrupt Generation
The receive path detects RLOS, AIS, QRPD and FLS. These alarms can be individually masked to prevent the
alarm from triggering an interrupt. To enable interrupt generation, the Global Interrupt Enable (GIE) bit must be
set "High" in the appropriate global register. Any time a change in status occurs (it the alarms are enabled), the
interrupt pin will pull "Low" to indicate an alarm has occurred. Once the status registers have been read, the
INT pin will return "High". The status registers are Reset Upon Read (RUR). The interrupts are categorized in
a hierarchical process block.
Figure
is a simplified block diagram of the interrupt generation process.
N
OTE
:
The interrupt pin is an open-drain output that requires a 10k
external pull-up resistor.
Network
Analyzer
E1 = PRBS 2
15
- 1
T1 = PRBS 2
23
- 1
External Loopback
XRT83VSH38
8-Channel
Short Haul LIU
Cable Loss
Flat Loss
Tx
Tx
Rx
Rx
W&G ANT20
Sinewave
Generator
Flat Loss
W&G ANT20
Network
Analyzer
Cable Loss
XRT83VSH38
8-Channel LIU
E1 = 1,024kHz
T1 = 772kHz
E1 = PRBS 2
15
- 1
T1 = PRBS 2
23
- 1
Tx
Tx
Rx
Rx
External Loopback
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