Juniper MX240 Hardware Manual page 108

MX240 3D Universal Edge Router Hardware Guide
78
MICs receive incoming packets from the network and transmit outgoing packets to the
network. During this process, each MIC performs framing and high-speed signaling for
its media type. Before transmitting outgoing data packets through the MIC interfaces,
the MPCs encapsulate the packets received. Each MPC is equipped with up to four Junos
Trio chipsets, which perform control functions tailored to the MPC's media type. The
MPCs interface with the power supplies and Switch Control Boards (SCBs). You must
install redundant SCBs to support full line-rate.
The MX240 router supports up to three MPCs. You must install a high-capacity fan tray
to use an MPC. For power requirements, see
Routers" on page 137.
The router has two dedicated line card slots for DPCs, MPCs, or FPCs. MPCs install
horizontally in the front of the router (see
numbered supports either one line card or one SCB. The line card slots are numbered
1/0
1/0 , 1 , and 2 , bottom to top. An MPC can be installed in any slot on the router that supports
MPCs. You can install any combination of line card types in the router.
When a slot is not occupied by an MPC or other line card, you must insert a blank DPC
panel to fill the empty slot and ensure proper cooling of the system.
MPCs are hot-removable and hot-insertable. When you install an MPC in an operating
router, the Routing Engine downloads the MPC software, the MPC runs its diagnostics,
and the Packet Forwarding Engines housed on the MPC are enabled. Forwarding on other
MPCs continues uninterrupted during this process.
Figure 27 on page 79 shows a typical MPC supported on the MX240 router.
Figure 5 on page 10 shows an MPC installed horizontally in the MX240 Router. For more
information about MPCs, see the
"Calculating Power Requirements for MX240
Figure 27 on page
MX Series Interface Module Reference
Copyright © 2017, Juniper Networks, Inc.
79). One multifunction slot
.