Yup.
There was a time when multimode was a lot cheaper. The good news is that
he distance limitations on multimode meant that hey were always short
links. As it happens, you can often put a singlemode SFP in place of a
multimode SFP for those short links, and there will be enough margin for
them to work just fine.
bp
<part15sbs{at}gmail{dot}com>
On 7/26/2018 3:19 PM, Adam Moffett wrote:
On 7/26/2018 5:56 PM, Seth Mattinen wrote:
On 7/26/18 2:50 PM, Mike Hammett wrote:
Save yourself the hassle and never use multimode for anything.
Multimode is always a mistake at some point in its lifetime.
Singlemode is forever.
Single mode is better in all cases.
The only reason for multimode was that the the transmitter for single
mode is a laser and lasers were expensive. Multimode uses LED
transmitters which were cheaper. VCSEL Lasers turned that upside down
and single mode is the cheaper one now. The fiber itself costs about
the same.
There are always exceptions. Last I knew the only "approved" SFP for
a Telrad Compact was a multimode one. The device will toss alarms if
you put in any other SFP module.
....and I'll grant you that I last tried a 3rd party SFP about 2 years
ago, so this could have changed, but it was definitely true in 2015 &
2016. So all of our Compacts have a multimode fiber cable. Cest La Vie.
It was also the case that SFPs with industrial temperature spec were
cheaper in multimode. I'm not sure if that's still true, but it was
for awhile.
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