Mx240 Modular Port Concentrator (Mpc) Description - Juniper MX240 Hardware Manual

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MX240 Modular Port Concentrator (MPC) Description

Modular Port Concentrators (MPCs) provide packet forwarding services. The MPCs are inserted into a
slot in a router. Modular Interface Cards (MICs) provide the physical interfaces and install into the MPCs.
You can install up to two MICs of different media types on the same router as long as the router supports
those MICs.
A specialized fixed configuration MPC provides higher port density over MICs and combines packet
forwarding and Ethernet interfaces onto a single line card. The fixed configuration MPC is inserted into a
slot in a router and contains no slots for MICs.
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 "Calculating Power Requirements for MX240 Routers" on page 196.
The router has two dedicated line card slots for DPCs, MPCs, or FPCs. MPCs install horizontally in the
front of the router (see Figure 38 on page 155). One multifunction slot numbered 1/0 supports either one
line card or one SCB. The line card slots are numbered 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 38 on page 155 shows a typical MPC supported on the MX240 router. Figure 39 on page 155 shows
an MPC installed horizontally in the MX240 Router. For more information about MPCs, see the MX Series
Interface Module Reference.