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LXT362 Datasheet(PDF) 22 Page - Intel Corporation

Part # LXT362
Description  Integrated T1 LH/SH Transceiver for DS1/DSX-1 or PRI Applications
PDF  48 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

LXT362 Datasheet(HTML) 22 Page - Intel Corporation

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LXT362 — Integrated T1 LH/SH Transceiver for DS1/DSX-1 or PRI Applications
22
Datasheet
2.7.1.2
Analog Loopback (ALOOP)
See Figure 7. Analog loopback (ALOOP) exercises the maximum number of functional blocks.
ALOOP operation disconnects the RTIP/RRING inputs from the line and routes the transmit
outputs back into the receive inputs. This tests the encoders/decoders, jitter attenuator, transmitter,
receiver and timing recovery sections.
In Hardware mode, ALOOP becomes active when the LLOOP pin is floating (i.e. Midrange). In
Host mode, setting bit CR2.EALOOP = 1 commands ALOOP. Note that ALOOP overrides all
other loopback modes.
Figure 6. Local Loopback
Timing
Recovery
TTIP
RTIP
TRING
JA*
RRING
* If Enabled
TCLK
RCLK
TPOS
RPOS
TNEG
RNEG
Timing &
Control
Timing
Recovery
TTIP
TRING
* If Enabled
TCLK
RCLK
TPOS
RPOS
TNEG
RNEG
Timing &
Control
RTIP
RRING
JA*
Local Loopback with JA in Transmit Path
Local Loopback withJAinReceive Path
Figure 7. Analog Loopback
TTIP
RTIP
TRING
JA*
RRING
* If Enabled
TCLK
RCLK
TPOS
RPOS
TNEG
RNEG
TTIP
RTIP
TRING
RRING
* If Enabled
TCLK
RCLK
TPOS
RPOS
TNEG
RNEG
JA*
Analog Loopback with JA in Transmit Path
Analog Loopback with JA in Receive Path
Timing
Recovery
Timing
Recovery



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