82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 55

• Manufacturer Part Number: 82P2821BH
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2821BH

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

3.5.8.2 Remote Loopback
Either manual Remote Loopback configuration or automatic Remote
Loopback configuration will enable Remote Loopback.
is assigned in the receive path (i.e., the PD_POS bit (b3, PD,...) is ‘0’)
and the AUTOLP bit (b3, LOOP,...) is ‘1’. The corresponding channel will
enter Remote Loopback when the activate IB code is detected in the
receive path for more than 5.1 sec.; and will return from Remote Loop-
back when the deactivate IB code is detected in the receive path for
more than 5.1 sec. Refer to section Inband Loopback (IB) Detection on
page 50 for details. When automatic Remote Loopback is active, setting
the AUTOLP bit (b3, LOOP,...) back to ‘0’ will also stop automatic
Functional Description
IDT82P2821
Remote Loopback can be configured manually or automatically.
Manual Remote Loopback is enabled by the RLP bit (b1, LOOP,...).
Automatic Remote Loopback is enabled when the pattern detection
AIS generation
LLOS, AIS
detection
X
Figure-33 Priority Of Diagnostic Facilities During Manual Remote Loopback
Pattern generation
Loopback
Remote
AIS generation
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
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Remote Loopback. The setting of the PD_POS bit (b3, PD,...) should not
be changed during automatic Remote Loopback. The AUTOLP_S bit
(b7, STAT0,...) indicates the automatic Remote Loopback status.
enabled) is internally looped to the Waveform Shaper. The data stream
received from the line side is still output to the system side, while the
data stream input from the system side is covered by the Remote Loop-
back data and the status on TCLKn does not affect the Remote Loop-
back. However, the BPV/CV, EXZ, SLOS, AIS and pattern detection in
the transmit path still monitors the data stream input from the system
side.
the receive path is: pattern generation > AIS generation; the priority of
the diagnostic facilities in the transmit path is: pattern generation >
looped data. AIS generation is disabled in the transmit path. Refer to
Figure-33.
In Remote Loopback mode, the data stream output from the RJA (if
In Remote Loopback mode, the priority of the diagnostic facilities in
pattern detection
BPV/CV, EXZ,
BPV/CV, EXZ, SLOS,
AIS, pattern detection
Pattern generation
February 6, 2009
Rx path
Tx path