Which SFP transceiver and fibre type to use for White Rabbit
Standard compatible to 1000BASE-BX10
As in White Rabbit it is of uttermost importance to have equal cable
lenghts in both directions, a single fibre should be used for sending
data both directions.
As we claim a compatibility with Ethernet, we use what the Gigabit
Ethernet standards propose:
http://en.wikipedia.org/wikis/Gigabit_Ethernet: "1000BASE-BX10 is a
capable of up to 10 km over a single strand of single-mode fiber, with a
different wavelength going in each direction.
The terminals on each side of the fibre are not equal, as the one
transmitting "downstream" (from the center of the network to the
outside) uses the 1490 nm wavelength, and the one transmitting
"upstream" uses the 1310 nm wavelength."
With 'terminals' is meant terminal at a high level, not the connectors.
The norm is IEEE
(section 59, pdf page 95), but it's not clear from the specification
what connectors (LC or SC) they propose for the two sides. Searching for
"1000BASE-BX10 connector" comes up with LC connectors (mostly for
Conclusion: White Rabbit should follow the 1000BASE-BX10 standard and
use 1310/1490 pairs with a single LC connector.
More specifically, the Switch ports transmitting downstream (to
endpoints) should use 1490nm on the transmitter and 1310nm on the