[j-nsp] What is pc-2/0/0 Type: PIC-Peer?

[Chuck Anderson]

On my shiny new M120 running 8.5 I have this "PIC-Peer" interface 
which was transmitting ~6000 pps / ~30 Mbps until I changed something 
in the config (not sure what caused it to stop--I can probably go back 
and correlate the time on the graph to the log in the router to see 
what changed).  Now as you can see, it is doing very little traffic.  
What is this interface for and why was it pushing so much traffic?

> show interfaces pc-2/0/0
Physical interface: pc-2/0/0, Enabled, Physical link is Up
  Interface index: 139, SNMP ifIndex: 34
  Type: PIC-Peer, Link-level type: PIC-Peer, MTU: Unlimited, Speed: 800mbps
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps Internal: 0x4000
  Link type      : Full-Duplex
  Link flags     : None
  Last flapped   : 2008-02-19 14:12:44 EST (2w2d 19:16 ago)
  Input rate     : 1672 bps (3 pps)
  Output rate    : 2480 bps (2 pps)

  Logical interface pc-2/0/0.16383 (Index 71) (SNMP ifIndex 35)
    Flags: Point-To-Point SNMP-Traps Encapsulation: PIC-Peering
    Protocol inet, MTU: Unlimited
      Flags: None
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.0.0.48, Local: 10.0.0.1
      Addresses
        Local: 10.0.0.6