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AV02-4528EN - August 11, 2015

Lane Ordering

Care must be taken to reassemble XLPPI information at the host receiver due to uncertainty of phase alignment of Lane

A and B between transmit and receive multiplexer stages. The transceiver will not assure XLPPI lane assignment end-to-

end in order to keep complexity and power dissipation in the QSFP+ footprint to a minimum. Once end-to-end com-

munication has been established and lane ordering established, lane assignment may change again each time the link

is re-established, such as when TX LOS, RX LOS, or when module power cycling occurs.

Figure 18. Transceiver Lane Ordering Limitations

2:1 Electrical

Multiplexer

2:1 Electrical

Multiplexer

XLPPI Lane A

XLPPI Lane B

XLPPI Lane C

XLPPI Lane D

2:1 Electrical

Multiplexer

2:1 Electrical

Multiplexer

1 x 20Gb Optical Lane

1 x 20Gb Optical Lane

XLPPI Lane A or B

XLPPI Lane A or B

XLPPI Lane C or D

XLPPI Lane C or D