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參數(shù)資料
| 型號： | XRT75R12IB |
| 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 JITTER ATTENUATOR |
| 中文描述： | DATACOM, PCM TRANSCEIVER, PBGA420 |
| 封裝： | 35 X 35 MM, TBGA-420 |
| 文件頁數(shù)： | 39/89頁 |
| 文件大?。?/td> | 457K |
| 代理商： | XRT75R12IB |
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PRELIMINARY
XRT75R12
REV. P1.0.2
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
36
4.6
This feature is used for monitoring the transmit line for occurrence of fault conditions such as a short circuit on
the line or a defective line driver. To activate this function, connect MTIP_n pins to the TTIP_n lines via a 270
resistor and MRing_n pins to TRing_n lines via 270
resistor as shown in Figure 24.
Transmit Drive Monitor
When the MTIP_n and MRing_n are connected to the TTIP_n and TRing_n lines, the drive monitor circuit
monitors the line for transitions. The DMO_n (Drive Monitor Output) will be asserted “Low” as long as the
transitions on the line are detected via MTIP_n and MRing_n. If no transitions on the line are detected for 128
± 32 TxClk_n periods, the DMO_n output toggles “High” and when the transitions are detected again, DMO_n
toggles “Low”.
N
OTE
:
The Drive Monitor Circuit is only for diagnostic purpose and does not have to be used to operate the transmitter.
4.7
Transmitter Section On/Off
The transmitter section of each channel can either be turned on or off. To turn on the transmitter, set the input
pin TxON to “High” and write a “1” to the TxON_n control bit. When the transmitter is turned off, TTIP_n and
TRing_n are tri-stated.
N
OTES
:
1.
2.
This feature provides support for Redundancy.
If the XRT75R12 is configured in Host mode, to permit a system designed for redundancy to quickly shut-off the
defective line card and turn on the back-up line card, writing a “1” to the TxON_n control bits transfers the control
to TxON pin.
F
IGURE
24. T
RANSMIT
D
RIVER
M
ONITOR
SET
-
UP
.
TTIP(n)
TRing(n)
1:1
R3
75
TxPOS(n)
TxNEG(n)
TxLineClk(n)
TPData(n)
TNData(n)
TxClk(n)
31.6
+ 1%
31.6
+1%
R1
R2
MTIP(n)
MRing(n)
270
270
R1
R2
相關(guān)PDF資料 |
PDF描述 |
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| XRT75VL00 | E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
| XRT75VL00IV | E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
| XRT79L71 | 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L71IB | 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L72 | 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT75R12IB-F | 功能描述:外圍驅(qū)動器與原件 - PCI 12 Channel 3.3V-5V temp -45 to 85C RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT75R12IB-L | 功能描述:LIN 收發(fā)器 Attenuator RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8 |
| XRT75VL00 | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
| XRT75VL00_08 | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
| XRT75VL00D | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
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