Juniper J-series Services Router J2350 Hardware Manual page 67

Features. Gigabit Ethernet uPIMs provide the following key features:
The multiport uPIMs can be used as switches in the access layer (for connections
to workstations and desktops). For more information, see the JUNOS Software
Interfaces and Routing Configuration Guide.
Link speed for 8-port and 16-port Gigabit Ethernet uPIMs is configurable to 10,
100, or 1000 Mbps, and transmission mode is configurable to half or full duplex.
The 1-port and 6-port SFP Gigabit Ethernet uPIMs cannot be manually
configured—they are set at 1000 Mbps and full duplex.
Autonegotiation.
1-port and 6-port Gigabit Ethernet uPIMs use SFP transceivers to allow different
connectors to be used on uPIM ports. These SFP Gigabit Ethernet uPIMs support
1000Base-SX, 1000Base-LX, and 1000Base-T SFPs. They do not support
1000Base-LH SFPs.
1000Base-SX and 1000Base-LX SFP transceivers have the following characteristics:
Duplex LC/PC connector (Rx and Tx).
Optical interface support—See the JUNOS Software Administration Guide.
8-port and 16-port Gigabit Ethernet uPIMs—and SFPs on the 1-port and 6-port
uPIMs—support 1000Base-T RJ-45 connectors.
For pinouts of cable connectors for Gigabit Ethernet uPIMs, see "Gigabit Ethernet
uPIM RJ-45 Connector Pinout" on page 189.
Limitations. Gigabit Ethernet uPIMs have the following limitations:
Gigabit Ethernet uPIMs do not support SNMP.
Gigabit Ethernet uPIM interfaces can be configured up to a maximum MTU size
of 9014 bytes.
Installation. Gigabit Ethernet uPIMs can be inserted in any slot on J2320, J2350,
J4350, or J6350 Services Routers.
Throughput for a uPIM is higher when it is inserted in a high-speed slot. High-speed
slots are slots 3 and 6 on the J4350 router, and slots 2, 3, 5, and 6 on the J6350
router.
16-port Gigabit Ethernet uPIMs are two slots high. Because the connector on the PIM
is on the lower half, the PIM occupies the slot that it is plugged into and the slot above
it. Thus you cannot install a 16-port uPIM in the top slots of a router. For example,
on a J4350 router you cannot install a 16-port uPIM in slots 1 and 4. If you install
the PIM in slot 2, it occupies both slots 2 and 1.
To install or remove a PIM, see "Replacing a PIM" on page 120.
Interface LEDs. For 8-port and 16-port Gigabit Ethernet uPIMs, the activity LED is
located on the left side of each port, and the link LED is located on the right side of
each port. For the 6-port Gigabit Ethernet uPIM, the LEDs are located to the right of
each port, with the link LED above the activity LED. LEDs on the 1-port uPIM are
clearly labeled.Table 21 on page 44 describes the meaning of the LEDs.
Chapter 3: PIM Overview
Field-Replaceable PIMs
43