Datasheet: https://www.juniper.net/assets/us/en/local/pdf/datasheets/1000597-en.pdf
MX80 ( 2RU / througput 80Gbps / 2 MICs + Rear for MS-MIC)
The MX80 has two front MIC slots and one rear MIC slot. The rear MIC slot only supports the MS-MIC.
The routers are compact and two rack units (U) tall
Documentation and Software:
http://www.juniper.net/support/downloads/?p=mx80#docs
Junos OS for MX Series 3D Universal Edge Routers
Hardware Compatibility Tool
https://pathfinder.juniper.net/hct/category/
Pathfinder
https://pathfinder.juniper.net/home/#MX80/Overview
...