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參數(shù)資料
| 型號： | LXT386BE |
| 英文描述： | PCM TRANSCEIVER|QUAD|CEPT PCM-30/E-1|CMOS|BGA|160PIN|PLASTIC |
| 中文描述： | 的PCM收發(fā)器|四|優(yōu)稅PCM-30/E-1 |的CMOS | BGA封裝| 160PIN |塑料 |
| 文件頁數(shù)： | 27/80頁 |
| 文件大?。?/td> | 1112K |
| 代理商： | LXT386BE |
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Octal T1/E1/J1 Transceiver
—
LXT384
Datasheet
27
2.3.1.3
Output Driver Power Supply
The output driver power supply (TVCC pins) can be either 3.3V or 5V nominal. When TVCC=5V,
LXT384 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 LXT384 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.
The Channel 4 (TVCC4) power supply pin is used to determine 3.3V or 5.0V transmit operation.
Removing the series resistors for T1 applications with TVCC=3.3V, improves the power
consumption of the device. See
Table 36
.
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 6
for the recommended external line circuitry.
2.3.1.4
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.
2.4
Driver Failure Monitor
The LXT384 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.
A capacitor, charged via a measure of the driver output current and discharged by a measure of the
maximum allowable current, is used to detect a secondary short failure. Secondary shorted lines
draw excess current, overcharging the cap. When the capacitor charge deviates outside the nominal
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 LXT384 to DSX-1 cross-connect point.
2. Maximum cable loss at 772KHz.
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