參數(shù)資料
型號(hào)： XRT83VSH314IB
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述： DATACOM, PCM TRANSCEIVER, PBGA304
封裝： 31 X 31 MM, 1.27 MM PITCH, PLASTIC, BGA-304
文件頁數(shù)： 41/80頁
文件大小： 497K
代理商： XRT83VSH314IB
XRT83VSH314
38
REV. 1.0.1
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
5.4
For 1:1 or 1+1 line card redundancy in T1/E1 applications, power failure could cause a line card to change the
characteristics of the line impedance, causing a degradation in system performance. The XRT83VSH314 was
designed to ensure reliability during power failures. The LIU has patented high impedance circuits that allow
the receiver inputs and the transmitter outputs to be in "High" impedance when the LIU experiences a power
failure or when the LIU is powered off.
Power Failure Protection
N
OTE
:
For power failure protection, a transformer must be used to couple to the line interface. See the TAN-56 application
note for more details.
5.5
Overvoltage and Overcurrent Protection
Physical layer devices such as LIUs that interface to telecommunications lines are exposed to overvoltage
transients posed by environmental threats. An Overvoltage transient is a pulse of energy concentrated over a
small period of time, usually under a few milliseconds. These pulses are random and exceed the operating
conditions of CMOS transceiver ICs. Electronic equipment connecting to data lines are susceptible to many
forms of overvoltage transients such as lightning, AC power faults and electrostatic discharge (ESD). There
are three important standards when designing a telecommunications system to withstand overvoltage
transients.
UL1950 and FCC Part 68
Telcordia (Bellcore) GR-1089
ITU-T K.20, K.21 and K.41
N
OTE
:
For a reference design and performance,
see the TAN-54 application note for more details.
5.6
Non-Intrusive Monitoring
In non-intrusive monitoring applications, the transmitters are shut off by setting TxON "Low". The receivers
must be actively receiving data without interfering with the line impedance. The XRT83VSH314’s internal
termination ensures that the line termination meets T1/E1 specifications for 75
,
100
or 120
while
monitoring the data stream. System integrity is maintained by placing the non-intrusive receiver in "High"
impedance, equivalent to that of a 1+1 redundancy application. A simplified block diagram of non-intrusive
monitoring is shown in
Figure 29
.
F
IGURE
29. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
A
N
ON
-I
NTRUSIVE
M
ONITORING
A
PPLICATION
Line Card Transceiver
Non-Intrusive Receiver
Node
XRT83VSH314
XRT83VSH314
Data Traffic
相關(guān)PDF資料
PDF描述
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XRT83VSH316IB 16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT83VSH314IB-F 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 14 Channel Short-Haul 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
XRT83VSH314IB-SAM 制造商:Exar Corporation 功能描述:FOR FUJITSU ONLY
XRT83VSH316 制造商:EXAR 制造商全稱:EXAR 功能描述:16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH316_07 制造商:EXAR 制造商全稱:EXAR 功能描述:16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH316ES 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 16 CH T1/E1LIUSH LOW COST VERSION 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
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