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This guide provides an overview and description of the Physical Interface Cards (PICs) supported by the Juniper Networks M320 Internet router. The PICs are described alphabetically. Table 1 lists the PICs supported by the M320 Internet router by PIC family.

PICs provide the physical connection to various network media types. The PICs are mounted on Flexible PIC Concentrators (FPCs), which are inserted into a slot in a router. A PIC typically occupies a single slot on an FPC. PICs receive incoming packets from the network and transmit outgoing packets to the network. During this process, each PIC performs framing and high-speed signaling for its media type. Before transmitting outgoing data packets, the PICs encapsulate the packets received from the FPCs. Each PIC is equipped with a media-specific ASIC that performs control functions tailored to the PIC's media type. For complete information about installing PICs and transceivers, see the PIC and Transceiver Installation Instructions located at https://www.juniper.net/techpubs/.

Blank PICs resemble other PICs but do not provide any physical connection or activity. When a slot is not occupied by a PIC, you must insert a blank PIC to fill the empty slot and ensure proper cooling of the system.

M320 routers support the Type 1, Type 2, and Type 3 FPCs listed in Table 2. Table 3 provides a PIC/FPC compatibility matrix for the current PICs for the M320 router.

For a complete list of end-of-life FPCs and end-of-life Enhanced FPCs for M-series and T-series routing platforms, see the M-series and T-series Routing Platform End-of-Life FPC Guide located at https://www.juniper.net/techpubs/.

Combinations of PICs—In most cases, you can install PICs of different media types on the same FPC as long as the FPC and the routing platform support those PICs. However, configuration rules might limit certain combinations of PICs on some platforms. If you have different PIC families on a single FPC and are running JUNOS 6.3 or later, review the configuration rules to plan which PICs to install on the FPCs for your routing platform. Consult the most recent technical bulletins about configuration rules for PIC combinations on the Juniper Networks Support site at https://www.juniper.net/support/.

Newer JUNOS services for some PICs can require significant Internet Processor ASIC memory. Ethernet and SONET PICs typically do not use large amounts of memory. Gigabit Ethernet, ATM2, IQ serial PICs, and Adaptive Services PICs use more. To conserve memory, you can group PICs in the same family together on the same FPC.

When you upgrade to JUNOS Release 7.5 or later, a warning appears if any configuration rules affect your PIC combinations. If you continue the installation, one or more PICs might appear to be online (the LEDs are on), but the JUNOS software cannot enable them and they cannot pass traffic. As a workaround, you can:

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