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參數(shù)資料
| 型號： | XR-T5794 |
| 廠商： | Exar Corporation |
| 英文描述： | Quad E-1 Line Interface Unit |
| 中文描述： | 四的E - 1線路接口單元 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 201K |
| 代理商： | XR-T5794 |
XR-T5794
12
Rev. 2.01
SYSTEM DESCRIPTION
This device is a quad E1 transceiver which provides
electrical interface for 2.048Mbps applications. Its unique
architecture includes four receiver circuits that convert
CCITT G.703 compliant bipolar signals to TTL compatible
logic levels. Likewise, in the other direction, four
transmitters translate TTL compatible logic levels to
G.703 compatible bipolar signals. A fifth transmitter
circuit is used as a monitor output. One of the four AMI
receiver inputs or transmitter outputs can be selected (via
MONSEL[2..0] lines) to be monitored. The MOUT output
can be disabled using the MONEN signal.
This device supports two different types of loopback
functions. Each of four channels can be independently
looped either in local or remote sides digitally. The
remote loopback is performed between the receiver input
and transmitter output. To activate the remote loopback
on channel n, LOOPENn and LPMODn inputs are driven
high. Local loopback on channel n, can be established
similarly by driving LOOPENn high and clearing LPMODn
inputs. More than one channel can be tested
simultaneously.
RECEIVERS
Each of the four identical E1 line receivers will accept
bipolar signals meeting the CCITT G.703 pulse mask
requirements. Each input stage consists of a slicing
circuitry which samples the incoming pulses at a fixed
percentage of the signals maximum amplitude. The
slicing voltage level is generated using a precision peak
detector. The receiver section can tolerate up to 12dB of
line loss (measured at 1.024MHz).
A loss of signal (LOS) is detected on any inputs by input
fail circuitry. There is an independent LOS pin dedicated
for each of the receivers. The LOS detection is based on
signal energy instead of number of zeros.
A balanced signal (100
or 120
) must be coupled by a
transformer. An unbalanced signal (75
) may be coupled
via a capacitor or transformer coupled.
TRANSMITTERS
This device contains five identical CCITT G.703
compliant transmitters which meet the return loss
requirements. Each transmitter is a single-ended voltage
driver. External resistors are used to maintain an
accurate source impedance that has a high return loss to
the transformer or the capacitor. Each of the drivers can
be individually disabled, this is required in fault tolerant
applications where redundancy is a requirement. During
power-down mode of operation the bipolar outputs can be
disabled.
To protect the data integrity during a brownout, the output
pulse amplitudes are reduced by a factor of 25% if the
supply drops below an internally set limit.
Transmission is possible either with or without a clock. If a
clock is used, the transmit input data must consist of
full-width NRZ pulses, and the transmitter output pulse
width is determined by the duty cycle of the clock. If the
transmit clock is tied high, the transmitter output pulses
are determined by the input data pulse width. In this
mode, RZ data must be supplied to the device.
TXP TXN
RX
TX
RXP RXN
Remote Loopback
RX
IN
TXOUT
TXP TXN
RX
TX
RXP RXN
Local Loopback
RX
IN
TXOUT
LPMOD=0
LPEN=1
Figure 5. Loopback Configurations
LPMOD=1
LPEN=1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT5794ES | 制造商:EXAR 制造商全稱:EXAR 功能描述:Evaluation System |
| XRT5794ES-PLCC | 功能描述:外圍驅(qū)動器與原件 - PCI 4 CH E1 AFE RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT5794ES-TQFP | 功能描述:外圍驅(qū)動器與原件 - PCI 4 CH E1 AFE RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XR-T5794IJ | 制造商:EXAR 制造商全稱:EXAR 功能描述:Quad E-1 Line Interface Unit |
| XRT5794IJ-F | 功能描述:外圍驅(qū)動器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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