lxt362 Intel Corporation, lxt362 Datasheet - Page 22

• Manufacturer Part Number: lxt362
• Description: Integrated T1 Lh/sh Transceiver For Ds1/dsx-1 Or Pri Applications
• Manufacturer: Intel Corporation

LXT362 — Integrated T1 LH/SH Transceiver for DS1/DSX-1 or PRI Applications
2.7.1.2
22
Figure 6. Local Loopback
Figure 7. Analog Loopback
Analog Loopback (ALOOP)
See
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
7. Analog loopback (ALOOP) exercises the maximum number of functional blocks.
RNEG
TNEG
RPOS
TPOS
RCLK
RNEG
TCLK
RPOS
TPOS
TNEG
RCLK
TCLK
RNEG
RPOS
TNEG
TPOS
RCLK
RPOS
RNEG
TCLK
TNEG
TPOS
RCLK
TCLK
Analog Loopback with JA in Transmit Path
Analog Loopback with JA in Receive Path
Local Loopback with JA in Transmit Path
Local Loopback with JA in Receive Path
JA*
JA*
JA*
* If Enabled
* If Enabled
JA*
Recovery
Recovery
Timing
Timing
* If Enabled
* If Enabled
Timing &
Timing &
Control
Control
Recovery
Recovery
Timing
Timing
TRING
TTIP
RTIP
RRING
RTIP
RRING
TRING
TTIP
RTIP
RRING
RTIP
RRING
TTIP
TRING
TTIP
TRING
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