Juniper MX2020 Hardware Manual page 100

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120-Gigabit Ethernet of comprehensive Layer 3 routing (IPv4 and IPv6), and Layer 2 switching. The MPCs
also support inline services and advanced Hierarchical QoS (H-QoS) per MX Series slot.
Modular Interface Cards (MICs) install into the MPCs to provide the physical interfaces. You can install up
to two MICs of different media types on the same MPC as long as the MPC supports those MICs.
NOTE: The MX2020 router also supports fixed port MPCs.
Each MPC is equipped with up to four Junos Trio chipsets, which perform control functions tailored to
the MPC's media type.
The MX2020 router supports up to 20 MPCs. For power requirements, see Calculating DC Power
Requirements for MX2020 Routers and "Calculating AC Power Requirements for MX2020 Routers" on
page 186.
The router has 20 dedicated line card slots for MPCs. MPCs install vertically in the front of the router. The
dedicated slots are numbered 0 though 9 (bottom), and 10 though 19 (top), left to right. An MPC can be
installed in any line card slot.
When an MPC slot is not occupied, you need to install a blank MPC panel.
MPCs are hot-removable and hot-insertable. When you install an MPC in an operating router, the CB-RE
downloads the MPC software. The MPC runs its diagnostics and enables the Packet Forwarding Engines
housed on the MPC. Forwarding on other MPCs continues uninterrupted during this process.
Figure 30 on page 77 shows an example of an MPC. Figure 31 on page 78 shows an MPC installed vertically
in the MX2020 router. For more information about MPCs, see the MX Series Interface Module Reference.
Figure 30: Modular Port Concentrator (MPC)