MX104 3.5RU 4x 10GE + 4x MICs

Datasheet: https://www.juniper.net/assets/us/en/local/pdf/datasheets/1000597-en.pdf

https://www.juniper.net/techpubs/en_US/release-independent/junos/topics/concept/mx104-chassis-overview.html

Capacity:        80Gbps

Slots:        4  ( 1/2 slots?)   MIC Only 

The router is environmentally hardened

Size: 3.5 rack units (U; that is, 6.125 in., or 15.55 cm) tall. 

SDN-ready

https://www.oreilly.com/library/view/juniper-mx-series/9781491932711/ch01.html

Each MX104 router has three built-in MPCs  (FPC 0 through FPC 2)

ring: bottom left: 0/0 ,  build-in 10G: 2/0/0,...

https://www.juniper.net/assets/us/en/local/pdf/datasheets/1000597-en.pdf