A quick note to put this in context -- The JUNOS interface naming convention = MM-F/P/T
MM = media: fe (Fast Ethernet), ge (Gigabit Ethernet), se (Serial), t1 (T1 or DS-1), t3 (T3 or DS-3), so (SONET), etc.
F = FPC (M/T/MX-Series) or PIM (J-Series) slot in the chassis
P = PIC slot (M/T/MX-Series) in the FPC or 0 (J-Series does not use PICs)
T = Port #
PIM -- J-Series Physical Interface Module that slides into a chassis slot
The actual interface card (port adapter in Cisco-speak)
Includes the "built-in slot 0 PIM" represented by the 10/100/1000 ports that come with the J-Series routers
FPC -- M/T/MX-Series Flexible PIC Controller that slides into a chassis slot
The "carrier card" (or controller card in Cisco-speak) that allows you to slot interface cards
PIC -- M/T/MX-Series Physical Interface Card that slides into an FPC slot
The actual interface card (port adapter in Cisco-speak)
Port # -- One of the physical ports on a PIM or PIC that can be used to carry traffic
Much of this information is from the "JUNOS as a Second Language" course and the book "JUNOS Enterprise Routing" amongst other sources.
#PIM#PIC#FPC