Ot interfaces are down

Optics supports Optical Transport Network (OTN), a standard defined by ITU G.709. The standard defines OTN as a set of optical network elements that are connected by optical fiber links.

Optics bridges the gap between next-generation IP and legacy TDM networks. When you add optics to a Dense Wavelength Division Multiplexing (DWDM) network, you can easily manage a channel. For example, you can configure, troubleshoot, or see alarms. It is a standardized method for transparent transport of services over optical wavelengths.

Check out the document below on how to configure OTN Options on the interface:

https://www.juniper.net/documentation/us/en/software/junos/interfaces-ethernet/topics/topic-map/ethernet-otn-options-overview.html#xd_59648cd712cf133a--354d2026-18ac70ee37f--7e2c

For the Optics ot interfaces need "laser-enable" knob for the lasers to be enabled on the interface.
If "laser-enable" is absent or if "no-laser-enable" knob is configured the interface will reamin in down state and don't show up

Check out KB to understand the config needed for port-mapping on ACX6360-OX:
https://supportportal.juniper.net/s/article/Juniper-ACX6360-OX-not-passing-traffic-eventhough-et-00x-and-correspondingmappedot-01x-is-up

Refer document below for details on "laser-enable" knob:
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/laser-enable-edit-interfaces-optics-options-qfx-series.html

Here is a snippet of the output from lab for reference:
root@router# run show interfaces terse | match ot- 
ot-0/1/0                up    down --> remains down if the corresponding mapped interface or if laser is disabled

Refer document below for details on Optics options supported on ACX6360:
https://www.juniper.net/documentation/us/en/software/junos/interfaces-ethernet/topics/topic-map/ethernet-otn-options-overview.html#id-supported-optics-options-on-acx6360-and-acx5448-d-routers