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MX Series Interface Module Overview

Juniper Networks MX Series 5G Universal Routing Platforms process incoming and outgoing packets on several different types of interface modules (also known as line cards). The configuration syntax for each type of line card is the same: type-fpc/pic/port.:

Table 1:
Interface Module Description
Dense Port Concentrators (DPCs)

Provide multiple physical interfaces and Packet Forwarding Engines on a single board that installs into a slot within the MX240, MX480, and MX960 routers. These topics have more information about DPCs:

Flexible Port Concentrators (FPCs) and Physical Interface Cards (PICs)

FPCs provide packet forwarding services, PICs install in FPCs and provide physical interfaces for the router, FPCs are installed in a slot in an MX240, MX480, and MX960 router. These topics have more information about FPCs and PICs:

Trio Modular Port Concentrators (MPCs) and Modular Interface Cards (MICs) MPCs provide packet forwarding services, and MICs install into MPCs to provide the physical interfaces. You can install up to two MICs of different media types in the same MPC as long as the MPC supports those MICs. The maximum number of supported MPCs varies per router and hardware configuration. MPCs are inserted into a slot in an MX240, MX480, MX960, MX2008, MX2010, and MX2020 router. MPCs for MX5, MX10, MX40, MX80, and MX104 routers install directly into the router chassis. There are also fixed-configuration MPCs, with built-in network ports or services functionality, that do not accept MICs.

These topics have more information about MPCs and MICs:

Switch Control Boards (MX-SCBs, MX-SCBEs, MX-SCBE2s, and SCB3s)

Control power to MPCs, monitor and control system functions such as fan speed and the system front panel, and manage clocking, resets, and boots.

Depending on the MX chassis and the level of redundancy, the number of SCBs can vary. The MX240 and MX480 require two SCBs for 1+1 redundancy, whereas the MX960 requires three SCBs for 2+1 redundancy.

There are four generations of SCBs for MX Series 5G Universal Routing Platforms: SCB-MX, SCBE-MX, SCBE2-MX, and SCBE3-MX. These topics have more information about SCBs:

Switch Fabric Boards (SFBs) Provide increased fabric bandwidth per slot. The MX2000 line of routers can support eight SFBs and eight Enhanced SFBs (SFB2) but not both at the same time. SFBs are supported on MX2010 and MX2020 routers. These topics have more information about SFBs:
Routing Engines (REs) and Control Boards with Routing Engines (CB-REs)

Provide the software processes that run Junos OS. The Routing Engine maintains the routing tables, manages the routing protocols used on the router, controls the router interfaces, controls some chassis components, and provides the interface for system management and user access to the router. Each CB-RE is a combined Routing Engine and Switch Control Board in one unit. These topics have more information about REs and CB-REs for MX routers:


A special line card adapter (ADC) for line cards that were designed to work with the MX-SCB and MX-SCBE line cards (MPC1E, MPC2E, and MPC3E). MX-ADCs can only be used with MX2010 and MX2020 routers. The ADC is a hardware casing that fits into a line card slot. The MPCs attach to the ADCs which in turn attach to the backplane. See MX2000 Adapter Card (ADC) Description for more information about MX-ADCs.

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