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參數(shù)資料
| 型號： | LXT386 |
| 廠商： | Intel Corp. |
| 英文描述： | QUAD T1/E1/J1 Transceiver |
| 中文描述： | 四T1/E1/J1收發(fā)器 |
| 文件頁數(shù)： | 27/78頁 |
| 文件大?。?/td> | 500K |
| 代理商： | LXT386 |
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QUAD T1/E1/J1 Transceiver
—
LXT386
Datasheet
27
.
3.3.2
Transmit Pulse Shaping
The transmitted pulse shape is internally generated using a high speed D/A converter. Shaped
pulses are further applied to the line driver for transmission onto the line at TTIP and TRING. The
line driver provides a constant low output impedance regardless of whether it is driving marks.
3.3.2.1
Output Driver Power Supply
The output driver power supply (TVCC pins) can be either 3.3V or 5V nominal. When TVCC=5V,
LXT386 drives both E1 (75
/120
)
and T1 100
lines through a 1:2 transformer and 11
/
9.1
series resistors.
When TVCC=3.3V, the LXT386 drives E1 (75
/120
)
lines through a 1:2 transformer and 11
series resistor. A configuration with a 1:2 transformer and without series resistors should be used to
drive T1 100
lines.
Removing the series resistors for T1 applications with TVCC=3.3V, improves the power
consumption of the device. See
Table 35
.
On the other hand, series resistors in the transmit configuration improve the transmit return loss
performance. Good transmit return loss performance minimizes reflections in harsh cable
environments. In addition, series resistors provide protection against surges coupled to the device.
The resistors should be used in systems requiring protection switching without external relays.
Please refer to
Figure 7
for the recommended external line circuitry.
3.3.2.2
Power Sequencing
For the LXT384, we recommend sequencing TVCC first then VCC second or at the same time as
TVCC to prevent excessive current draw.
3.4
Driver Failure Monitor
The LXT386 transceiver incorporates an internal power Driver Failure Monitor (DFM) in parallel
with TTIP and TRING that is capable of detecting secondary shorts without cable. DFM is available
only in configurations with no transmit series resistors (T1 mode with TVCC=3.3V). This feature is
available in the serial and parallel host modes but not available in the hardware mode of operation.
Table 2. Line Length Equalizer Inputs
LEN2
LEN1
LEN0
Line Length
1
Cable Loss
2
Operation Mode
0
1
1
0 - 133 ft. ABAM
133 - 266 ft. ABAM
266 - 399 ft. ABAM
399 - 533 ft. ABAM
533 - 655 ft. ABAM
0.6 dB
1.2 dB
1.8 dB
2.4 dB
3.0 dB
T1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
E1 G.703, 75
coaxial cable and 120
twisted pair cable.
E1
1. Line length from LXT386 to DSX-1 cross-connect point.
2. Maximum cable loss at 772KHz.
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