On 10/20/20 7:27 AM, Adam Moffett wrote:
BiDi is newer. It's WDM built into the interface card. You'd use
duplex fibers because the circuit pre-dates BiDi, or the two fibers
are already there and you have nothing to lose by using them both.
The theoretical benefit of duplex is that you have the bandwidth of
two fibers. At one time it might also have been cheaper interface
cards, but obviously not anymore. You'd be dumb not to use BiDi
today, but you might not be dumb to have spare fibers available for
some future circumstance when a duplex interface will make sense.
40G QSFP+ BiDi requires two strands (one for each 20Gbps channel).
....which will be one of those "future circumstances". I'd still plan
on a single fiber to any individual premises and have extras for that
one place that needs 40G or 100G. I think we do a 12F drop cable into
any business prem or MDU, but houses are single fiber drops.
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