EELXT360PE.A2-868068 Cortina Systems Inc, EELXT360PE.A2-868068 Datasheet - Page 28

• Manufacturer Part Number: EELXT360PE.A2-868068
• Manufacturer: Cortina Systems Inc

Specifications of EELXT360PE.A2-868068

• 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: Compliant

LXT360 Transceiver
Datasheet: Long Form
249231, Revision 2.1
24 January 2008
2.7.3.4
2.7.3.5
2.7.3.6
2.7.4
2.7.4.1
Cortina Systems
Bipolar Violation Detection (BPV)
When the internal encoders/decoders are disabled or when configured in Unipolar mode,
bipolar violations are reported at the BPV pin. BPV goes High for a full clock cycle to indicate
receipt of a BPV . When the encoders/decoders are enabled, the LXT360 Transceiver does
not report bipolar violations due to the line coding scheme.
HDB3 Code Violation Detection (CODEV)
An HDB3 code violation (CODEV) occurs when two consecutive bipolar violations of the
same polarity are received (refer to ITU O.161). When CODEV detection is enabled, the
BPV pin goes High for a full RCLK cycle to report a CODEV violation. Note that bipolar
violations and zero substitution violations will also be reported on the BPV pin if these
options are enabled.
CODEV detection is not available in Hardware mode. In Host mode, HDB3 code violation
detection is enabled when the HDB3 encoders/decoders are enabled. This requires that
CR1.ENCENB = 1, also CR1.EC4:1 = 100x or 1010, which establishes E1 operation. To
select CODEV detection, set bit CR4.CODEV = 1.
HDB3 Zero Substitution Violation Detection (ZEROV)
An HDB3 ZEROV is the receipt of four or more consecutive zeros. This does not occur with
correctly encoded HDB3 data unless there are transmission errors. The BPV pin goes High
for a full RCLK cycle to report a ZEROV . Note that when ZEROV detection enabled, the BPV
pin will also indicate received BPVs and CODEVs, if these detection options are enabled.
ZEROV detection is not available in Hardware mode. In Host mode, HDB3 zero substitution
violation (ZEROV) detection is enabled when the HDB3 encoders/decoders are enabled.
This requires CR1.ENCENB = 1, also CR1.EC4:1 = 100x or 1010, which establishes E1
operation. To s elect ZEROV detection, set bit CR4.ZEROV = 1.
Alarm Condition Monitoring
Loss of Signal (LOS)
The Loss of Signal (LOS) monitor function is compatible with ITU G.775 and ETSI 300233.
The receiver LOS monitor loads a digital counter at the RCLK frequency. The count
increments with each received 0 and the counter resets to 0 on receipt of a 1. When the
count reaches “n” 0s, the LOS flag goes High, and the MCLK replaces the recovered clock
at the RCLK output in a smooth transition. For Hardware mode T1 operations, the number of
0s, n = 175, and for Hardware mode E1 operations, n = 32. In Host mode, either number can
be changed to 2048 by setting bit CR4.LOS2048 to 1.
For T1 operation, when the received signal has 12.5% 1’s density (16 marks in a sliding 128-
bit period, with fewer than 100 consecutive 0s), the LOS flag returns Low and the recovered
clock replaces MCLK at the RCLK output in another smooth transition.
For E1 operation, the LOS condition is cleared when the received signal has 12.5% 1’s
density (four 1s in a sliding 32-bit window with fewer than 16 consecutive 0s). In E1 Host
mode operation, the out-of-LOS criterion can be modified from 12.5% marks density to 32
consecutive marks by setting bit CR4.COL32CM = 1.
During LOS, the device sends received data to the RPOS/RNEG pins (or RDATA in Unipolar
mode). In Hardware and Host modes, the LOS pin goes High when a LOS condition occurs.
In Host mode, bit PSR.LOS =1 indicates a LOS condition, and will generate an interrupt if so
programmed.
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LXT360 Integrated T1/E1 LH/SH Transceiver for DS1/DSX-1 or PRI Applications
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2.7 Diagnostic Mode Operation
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