參數(shù)資料
型號(hào)： XRT83VSH38
廠商： Exar Corporation
英文描述： 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述： 8通道的T1/E1/J1短途線路接口單元
文件頁(yè)數(shù)： 41/76頁(yè)
文件大?。?/td> 722K
代理商： XRT83VSH38
XRT83VSH38
38
REV. 1.0.7
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
5.3
Power Failure Protection
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 XRT83VSH38 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.
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.
5.4
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
5.5
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 XRT83VSH38’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 30
.
F
IGURE
30. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
A
N
ON
-I
NTRUSIVE
M
ONITORING
A
PPLICATION
Line Card Transceiver
Non-Intrusive Receiver
Node
XRT83VSH38
XRT83VSH38
Data Traffic
相關(guān)PDF資料
PDF描述
XRT83VSH38IB 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT84L14 Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
XRT84L18 Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
XRT84L38 Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
XRT84L38_06 Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT83VSH38ES 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 8CH 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
XRT83VSH38IB 功能描述:接口 - 專用 8CH SH T1/E1 Line RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59
XRT83VSH38IB-F 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 8 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
XRT83VSH38IB-F 制造商:Exar Corporation 功能描述:T1/E1 LIU IC
XRT84L38 制造商:EXAR 制造商全稱:EXAR 功能描述:OCTAL T1/E1/J1 FRAMER
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