Yeup, that's a high power XGSPON transceiver. I assume there is also a heatsink on the transceiver as well? The transceiver would probably also be significantly longer than a normal transceiver. (2.5W is the danger zone if there's no heatsink)
Depending on which generational revision the transceiver is from, it might be expecting active airflow over the optics section. Switches and business class routers normally maintain negative pressure in the chassis, causing air to be pulled in through all the ports (thus causing airflow over the optics). If however the original ISP box didn't have active cooling, then it's probably designed to passively dissipate heat and all you'll have to do is make sure the surrounding environment stays around STP and there is headspace for convection to carry the heat away, but in general it will be fine in your MS-01's SFP+ (though the heatsink might block the pcie slot).
If you're still worried, you can grab a Klein or Fluke multimeter with a thermocouple and just double check the temps, they're useful to have around anyways. As long as the SFP+ cage inside the MS-01 <55C, you're fine. If the temps push past 60C you'll need some active airflow somewhere as you probably have a heat pocket forming behind or inside the case. Or alternatively at that point, you can also grab a 10G media converter, which will push that heat to an external box that you can mount on the wall where natural convection will help cool it (also helps keep the APC stuff out of the rack).
Depending on which generational revision the transceiver is from, it might be expecting active airflow over the optics section. Switches and business class routers normally maintain negative pressure in the chassis, causing air to be pulled in through all the ports (thus causing airflow over the optics). If however the original ISP box didn't have active cooling, then it's probably designed to passively dissipate heat and all you'll have to do is make sure the surrounding environment stays around STP and there is headspace for convection to carry the heat away, but in general it will be fine in your MS-01's SFP+ (though the heatsink might block the pcie slot).
If you're still worried, you can grab a Klein or Fluke multimeter with a thermocouple and just double check the temps, they're useful to have around anyways. As long as the SFP+ cage inside the MS-01 <55C, you're fine. If the temps push past 60C you'll need some active airflow somewhere as you probably have a heat pocket forming behind or inside the case. Or alternatively at that point, you can also grab a 10G media converter, which will push that heat to an external box that you can mount on the wall where natural convection will help cool it (also helps keep the APC stuff out of the rack).
