Juniper MX480, Hardware Manual

Page: 124 / 420

MX480 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 MPC as long as the MPC 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 MX480 router supports up to six MPCs. You must install a high-capacity fan tray to
use an MPC. For power requirements, see
“Calculating Power Requirements for MX480
Routers” on page 158 .
The router has six dedicated line card slots for DPCs, MPCs, or FPCs that are numbered
0 through 5 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 35 on page 125 shows a typical MPC supported on the MX480 router. For more
information about MPCs, see the
MX Series Interface Module Reference
.
Copyright © 2019, Juniper Networks, Inc. 124
MX480 Universal Routing Platform Hardware Guide