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参数资料
| 型号： | WJLXT384LEB1 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | DATACOM, PCM TRANSCEIVER, PQFP144 |
| 封装： | 20 X 20MM, ROHS COMPLIANT, LQFP-144 |
| 文件页数： | 85/140页 |
| 文件大小： | 1514K |
| 代理商： | WJLXT384LEB1 |
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49
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Intel LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
5. The data slicer processes the received signal, after which the signal simultaneously goes to
both the clock and data-recovery sections.
— The data and timing recovery circuits provide an input jitter tolerance better than required
by ITU G.823, as shown in Test Specifications, Figure 33, “Intel LXT384 Transceiver
— Depending on the options selected, recovered clock and data signals may be routed
through the jitter attenuator, through the HDB3/AMI decoder, and may be output to the
framer as either bipolar or unipolar data.
6.3.3
Receiver Loss-Of-Signal Detector
The LXT384 Transceiver loss-of-signal (LOS) detector circuit is designed to detect loss of signals
in both analog and digital domains. This circuit is independent of the data slicer.
In hardware mode, it complies with the latest ITU G.775 (for E1) and ANSI T1.231 (for T1)
recommendations.
Under software control, the detector can be configured to comply to the ETSI ETS 300 233
specification (LACS Register).
The receiver monitor loads a digital counter at the RCLK frequency. The counter is incremented
each time a zero is received, and reset to zero each time a one (mark) is received. Depending on the
operation mode, a certain number of consecutive zeros sets the LOS signal. The recovered clock is
replaced by MCLK at the RCLK output with a minimum amount of phase errors. MCLK is
required for receive operation. When the LOS condition is cleared, the LOS flag is reset and
another transition replaces MCLK with the recovered clock at RCLK. RPOS/RNEG will reflect the
data content at the receiver input during the entire LOS detection period for that channel.
6.3.3.1
G.755 and ETSI 300 233 - Loss of Signal Detection
In G.775 mode a loss of signal is detected if the signal is below 200mV (typical) for 32
consecutive pulse intervals. The LOS flag is reset when the received signal reaches 12.5%
ones density (4 marks in a sliding 32-bit period) with no more than 15 consecutive zeros and
the signal level exceeds 250mV (typical). Following the next MCLK transition, MCLK is
replaced with a recovered clock at the RCLK output.
In ETSI 300 233 mode, a loss of signal is detected if the signal is below 200mV for 2048
consecutive intervals (1 ms). The LOS condition is cleared and the output pin returns to Low
when the incoming signal has transitions when the signal level is equal or greater than 250mV
for more than 32 consecutive pulse intervals. This mode is activated by setting the LACS
register bit to one.
6.3.3.2
ANSI T1.231 - Loss of Signal Detection
The T1.231 LOS detection criteria is employed. LOS is detected if the signal is below 200 mV for
175 contiguous pulse positions. The LOS condition is terminated upon detecting an average pulse
density of 12.5% over a period of 175 contiguous pulse positions starting with the receipt of a
pulse. The incoming signal is considered to have transitions when the signal level is equal or
greater than 250 mV.
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