J4300 and J6300 Physical Interface Modules (PIMs)

Physical Interface Modules (PIMs) provide the physical connection to various network media types, receiving incoming packets from the network and transmitting outgoing packets to the network (see Figure 11). Each PIM is equipped with a dedicated network processor that forwards incoming data packets to the Routing Engine, and receives outgoing data packets from the Routing Engine. During this process, the PIM performs framing and line-speed signaling for its medium type.

PIMs are removable and insertable when the router is powered off. You can install a PIM into one of the six slots in the router chassis. If a slot is not occupied by a PIM, a PIM blank panel must be installed to shield the empty slot and to allow cooling air to circulate properly through the router.

Each PIM supported on the router has the following components:

• One or more cable connector ports—Accept a network media connector.
• LED—Indicates port status. Table 11 describes the meaning of the LED states.

The ADSL PIMs have more than one LED to indicate the status of the PIM and its ports. Table 16 describes the meaning of the LEDs for the ADSL PIMs used in J4300 and J6300 Services Routers.

Table 16: ADSL PIM LEDs

For pinouts of PIM cable connectors, see Network Cable Specifications and Connector Pinouts. For PIM replacement instructions, see Replacing a PIM.