Ug, N connectors and vampire taps. Ug.
From: Adam Moffett
Sent: Tuesday, October 20, 2020 8:27 AM
To: [email protected]
Subject: Re: [AFMUG] Fiber - Black Magic
There were lots of copper interfaces before everything settled on the 8-pin
modular telephone plug. 10-Base 2 could use any of the coax connectors (F, N,
BNC, etc), there were 15-pin D-sub connectors, vampire taps, EAD/TAE, and
probably more exotic stuff. We ended up with 8pin modular because in practice
it turned out to be the most useful for the most people in the most
circumstances. There's probably an old engineer who will talk your head off
about the benefits of TAE compared to the 8-pin telephone plug, but we settled
on the 8-pin telephone plug anyway.
The fiber stuff will settle out and become easier too. It's already happened
(more or less) on the physical connectors. Anything simplex in outside plant
is SC, anything on the LAN is LC. Duplex outside plant might be LC too.
Anything else is just old.
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.
On 10/20/2020 7:42 AM, Matt Hoppes wrote:
Right. But why would you use two fibers when BIDIs exist? Is there some
benefit?
On Oct 20, 2020, at 7:37 AM, Mark Radabaugh mailto:[email protected] wrote:
BIDI means you are using one fiber strand. Otherwise it’s 2 fibers, one
for transmit and the other for receive.
It’s not black magic - but you do need to have some knowledge of what you
are doing.
Mark
On Oct 20, 2020, at 7:18 AM, Matt Hoppes
<[email protected]> wrote:
Is there a reason there isn’t more a standard for the optics that go with
fiber?
It seems any time a cut over is done there’s always the question: which
optic are you using? Bi-Di or not ? Then some equipment only supports certain
optics.
Twice now we’ve tried to do 1gig to 10gig wave upgrades with our
providers (some large country wide names) and it’s taken multiple attempts
because of optic issues.
Copper - you just plug it in and it works. Why have we not gotten to this
point with fiber?
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