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Fast Ethernet PICs (T320 Router)

Figure 1: 4-Port Fast Ethernet PIC
4-Port Fast Ethernet PIC
Figure 2: 12-Port Fast Ethernet PIC
 12-Port Fast Ethernet PIC
Figure 3: 48-Port Fast Ethernet PIC
48-Port Fast Ethernet PIC
Figure 4: VHDC1-to-RJ-21 Cable
VHDC1-to-RJ-21 Cable

Software release

  • 4-port: Junos OS Release 5.5 and later (Type 1)

  • 12-port: Junos OS Release 6.0 and later (Type 1)

  • 48-port: Junos OS Release 8.3 and later (Type 2)


  • 4, 12, or 48 100Base-TX ports

  • Power requirements:

    • 4-port: 0.14 A @ 48 V (6.8 W)

    • 12-port: 0.23 A @ 48 V (11 W)

    • 48-port: 0.69 A @ 48 V (33.3 W)

Hardware Features

  • High-performance throughput on each port at speeds up to 100 Mbps

  • Source and destination Media Access Control (MAC) address filtering

  • RMON EtherStats packet buffering

  • 802.3 Ethernet standard compliant

  • 4-port PICs support MTUs up to 1533 bytes; 12-port PICs support MTUs up to 1532 bytes; 48-port PICs support MTUs up to 1532 bytes

  • 4-port PICs support 1,024 802.1q VLANs per port; 12-port PICs support 16 802.1q VLANs per port; 48-port PICs support 16 802.1q VLANs per port

Software Features

  • Autosensing full-duplex and half-duplex modes

  • Virtual Router Redundancy Protocol (VRRP)

  • 802.1q virtual LANs (VLANs)

  • Circuit cross-connect (CCC) VLAN

Cables and Connectors

4-port PIC:

  • Connector: Two-pair, Category 5 unshielded twisted-pair connectivity through an RJ-45 connector

  • Pinout: MDI noncrossover

12-port PIC:

  • Connector: One very high density connector interface (VHDCI)-to-RJ-21 cable that connects to an RJ-45 patch panel

48-port PIC:

  • VHDCI-to-RJ-21 cables that connect to an RJ-45 patch panel

  • Four VHDCI connectors that each service 12 10/100 ports

Note: Each of the four connectors on a 48-port Fast Ethernet PIC can support a maximum of approximately 800 Mbps. However, this constitutes oversubscription. Use this PIC only in environments that can support this level of oversubscription.


Status LED, one bicolor:

  • Off—PIC ports not enabled

  • Green—PIC is operating normally

  • Red—PIC has an error or failure

4-port PIC—One pair of port LEDs:

  • Link LED—If green, the port is online; if there is no light, the port is down

  • RX LED—If flashing green, the port is receiving data; if there is no light, the port might be on but is not receiving data

12-port PIC—One port LED per port:

  • Green—100-Mbps link established

  • Flashing green—100-Mbps activity

  • Yellow—10-Mbps link established

  • Flashing yellow—10-Mbps activity

  • Off—No link present

Note: The port LEDs remain lit on the 12-port PIC when the ports are down.

Note: The 48-port PIC does not have port LEDs. To check port status on a 48-port PIC, use the show interfaces fe-fpc/pic/port command. For more information about this command, see the Junos OS Network Interfaces Library for Routing Devices.