DJLXT380LE.B4 Cortina Systems Inc, DJLXT380LE.B4 Datasheet - Page 28

• Manufacturer Part Number: DJLXT380LE.B4
• Manufacturer: Cortina Systems Inc

Specifications of DJLXT380LE.B4

• Lead Free Status / RoHS Status: Not Compliant

LXT380 — Octal E1 G.703 Transceiver
2.8
2.9
2.10
28
Table 2.
Note: Remote loopback in channel 0 can only work if TCLK for that channel is clocked. The output
G.772 Monitoring
The LXT380 can be configured as an octal line interface unit with all channels working as regular
transceivers. In applications using only seven channels, the eight channel can be configured to
monitor any of the remaining channels inputs or outputs.
The monitoring is non-intrusive per ITU-T G.772.
The monitored line signal (input or output) goes through channel 0 clock and data recovery. The
signal can be observed digitally at the RCLK/RPOS/RNEG outputs. This feature can also be used
to create timing interfaces derived from a E1 signal. Please refer to Application Note: “Timing
Interface Using the LXT380.”
In addition, channel 0 can be configured to a Remote Loopback while in monitoring mode. This
will output the same data as in the signal being monitored at the channel 0 output (TTIP/TRING).
The output signal can then be connected to a standard test equipment with an E1 electrical interface
for monitoring purposes (non-intrusive monitoring).
drivers are tri-stated when TCLK is inactive.
Hitless Protection Switching (HPS)
The LXT386 transceivers include an output driver tristatability feature for T1/E1 redundancy
applications. This feature greatly reduces the cost of implementing redundancy protection by
eliminating external relays. Please refer to Application Note for guidelines for implementing
redundancy systems for both T1 and E1 operation using the LXT380/1/4/6.
Operation Mode Summary
Table 2
Operation Mode Summary
† Hardware mode only.
Clocked
Clocked
Clocked
Clocked
Clocked
Clocked
Clocked
Clocked
Clocked
MCLK
L
summarizes all LXT380 hardware settings and corresponding operating modes.
Clocked
Clocked
Clocked
Clocked
TCLK
H
H
H
L
L
L
LOOP
Open
Open
Open
Open
H
H
H
L
L
L
†
Data/Clock Recovery
Data/Clock Recovery
Data/Clock Recovery
Data/Clock Recovery
Data/Clock Recovery
Data/Clock recovery
Data/Clock recovery
Data/Clock recovery
Data/Clock recovery
Receive Mode
Power Down
Pulse Shaping ON
Pulse Shaping ON
Pulse Shaping ON
Pulse Shaping ON
Pulse Shaping ON
Transmit All Ones
Transmit All Ones
Figure 2 on page 8
Transmit Mode
Power down
Power down
Power down
No Analog Loopback
illustrates this concept.
Remote Loopback
Remote Loopback
Analog Loopback
No effect on op.
No effect on op.
No Loopback
No Loopback
No Loopback
No Loopback
Loopback
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