Why input errors on my Cisco 881 Internet router?

This is using Cisco Router 881 as a Internet router, for my Internet bandwidth 100 Mbps. This is a new setup. Recently, I typed "int fastethernet4" (for the WAN interface), and found that there are few errors as follows:

  DSL#sh int fa4
FastEthernet4 is up, line protocol is up
  Hardware is PQII_PRO_UEC, address is 885a.92c2.dba0 (bia 885a.92c2.dba0)
  Internet address is xxx.xxx.xxx.xxx/23
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 6/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 23/75/1563/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 2358000 bits/sec, 193 packets/sec
  5 minute output rate 64000 bits/sec, 105 packets/sec
     15760684 packets input, 884649953 bytes
     Received 0 broadcasts (0 IP multicasts)
     178 runts, 0 giants, 905* throttles
     985 input errors, 1 CRC, 0 frame, 984 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     13190300 packets output, 3412388052 bytes, 0 underruns
     0 output errors, 0 collisions, 4 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     1 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

Do the following matter? As they are increasing... How about 1 lost carrier?

   178 runts, 0 giants, 905* throttles
     985 input errors, 1 CRC, 0 frame, 984 overrun, 0 ignored

Thanks in advance