All J-series Services Routers include two fixed 10/100Base-TX Fast Ethernet ports. The LAN ports receive incoming packets from the network and transmit outgoing packets to the network. Each port 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.
The LAN ports are located on the front panel of the router (see Figure 13) and are configured like the ports on a Physical Interface Module (PIM). The LAN ports are not field-replaceable. The ports, labeled PORT 0 and PORT 1, correspond to fe-0/0/0 and fe-0/0/1 respectively, for configuration.
For pinouts of Fast Ethernet cable connectors, see Network Cable Specifications and Connector Pinouts.
Each port has two LEDs located on each side of the bottom of the port. Table 11 describes the LAN port LEDs.