DJLXT360LE.A2 Cortina Systems Inc, DJLXT360LE.A2 Datasheet - Page 16

• Manufacturer Part Number: DJLXT360LE.A2
• Manufacturer: Cortina Systems Inc

Specifications of DJLXT360LE.A2

• Number Of Transceivers: 1
• Operating Supply Voltage (typ): 5V
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Supplier Unconfirmed

LXT360 Transceiver
Datasheet: Long Form
249231, Revision 2.1
24 January 2008
2.3
2.3.1
2.3.2
2.3.3
2.3.4
Cortina Systems
Shaped pulses meeting the various T1, DS1, DSX-1 and E1 specifications are applied to the
AMI line driver for transmission onto the line at TTIP and TRING. The transceiver produces
DSX-1 pulses for short-haul T1 applications (settings from 0 dB to +6.0 dB of cable), DS1
pulses for long-haul T1 applications (settings from 0 dB to -22.5 dB), and G.703 pulses for
E1 applications. Refer to
specifications.
Receiver
A 1:1 transformer provides the interface to the twisted-pair line (RTIP/RING). Recovered
data is output at RPOS/RNEG (RDA TA in Unipolar mode), and the recovered clock is output
at RCLK. Refer to
Receive Equalizer
The receive equalizer processes the signal received at RTIP and RRING. The equalizer gain
is up to 43 dB in E1 long-haul applications and 36 dB for T1 applications. As shown in
Table 10 on page
gain applied to the equalizer. In Host mode, EC1 through 4 are established by bits 0 through
3 of Control Register #1 (CR1), respectively. In Hardware mode, pins EC1, EC2, EC3, and
EC4 specify equalizer gain setting. With EC1 Low, up to 36 dB of gain may be applied. When
EC1 is High, 26 dB is the gain limit to provide an increased noise margin in shorter loop
operations.
Receive Data Recovery
The transceiver filters the equalized signal and applies it to the peak detector and data
slicers. The peak detector samples the inputs and determines the maximum value of the
received signal. The data slicers are set at 50% of the peak value to ensure optimum signal-
to-noise performance.
After processing through the data slicers, the received signal goes to the data and timing
recovery section, then to the B8ZS/HDB3 decoder (if selected) and to the receive monitor.
The data and timing recovery circuits provide input jitter tolerance significantly better than
required by AT&T P ub 62411 and ITU G.823. See
page 41
Receive Digital Data Interface
Recovered data is routed to the Loss of Signal (LOS) Monitor. In Host mode, it also goes
through the Alarm Indication Signal (AIS, Blue Alarm) Monitor. The jitter attenuator (JA) may
be enabled or disabled in the receive data path or the transmit path. Received data may be
routed to either the B8ZS or HDB3 decoder or neither. Finally, the device may send the
digital data to the framer as either unipolar or bipolar data.
When decoding unipolar data to the framer, the LXT360 reports reception of bipolar
violations by driving the BPV pin High. During E1 operation in Host mode, the device can be
programmed to report HDB3 code violations and Zero Substitution Violations on the BPV
pin. See
Receiver Monitor Mode
The receive equalizer can be used in Monitor mode applications. Monitor mode applications
require 20 dB to 30 dB resistive attenuation of the signal, plus a small amount of cable
attenuation (less than 6 dB). In Host mode, setting bit CR3.EQZMON = 1 configures the
®
LXT360 Integrated T1/E1 LH/SH Transceiver for DS1/DSX-1 or PRI Applications
for details.
Section 2.7, Diagnostic Mode Operation, on page 20
31, Equalizer Control inputs (EC1 through EC4) determine the maximum
Table 33 on page 47
Figure 15 on page 45
for receiver timing specifications.
and
Section 5.0, Test Specifications, on
Figure 14 on page 44
TM
TM
for details.
for pulse mask
2.3 Receiver
Page 16