Meaning of `transmit timed out, tx_status 00 status e601' ?

[Piete Brooks]

A machine running RH6.1's 2.2.12-20smp kernel which has 3c59x.c:v0.99H 
11/17/98 is logging problems with xmit timeouts (see below).
What should I be looking at: switch port, UTP cable, or what ?

messages:

3c59x.c:v0.99H 11/17/98 Donald Becker \
	http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html 
eth0: 3Com 3c905B Cyclone 100baseTx at 0xe400,  00:50:04:6a:b4:a2, IRQ 16 
  8K byte-wide RAM 5:3 Rx:Tx split, autoselect/Autonegotiate interface. 
  MII transceiver found at address 24, status 782d. 
  Enabling bus-master transmits and whole-frame receives. 

ifconfig:

          RX packets:14532402 errors:0 dropped:0 overruns:24319 frame:0
          TX packets:14038897 errors:138 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          Interrupt:16 Base address:0xe400 

uptime:

  1:22pm  up 13 days,  5:04,  2 users,  load average: 0.00, 0.00, 0.00

dmesg:

eth0: transmit timed out, tx_status 00 status e601.
  Flags; bus-master 1, full 0; dirty 13933865 current 13933865.
  Transmit list 00000000 vs. ce5e1290.
  0: @ce5e1200  length 8000002a status 0001002a
  1: @ce5e1210  length 8000002a status 0001002a
  2: @ce5e1220  length 8000002a status 0001002a
  3: @ce5e1230  length 8000002a status 0001002a
  4: @ce5e1240  length 8000002a status 0001002a
  5: @ce5e1250  length 8000002a status 0001002a
  6: @ce5e1260  length 8000002a status 0001002a
  7: @ce5e1270  length 8000002a status 8001002a
  8: @ce5e1280  length 8000002a status 8001002a
  9: @ce5e1290  length 8000002a status 0001002a
  10: @ce5e12a0  length 8000002a status 0001002a
  11: @ce5e12b0  length 8000002a status 0001002a
  12: @ce5e12c0  length 8000002a status 0001002a
  13: @ce5e12d0  length 8000002a status 0001002a
  14: @ce5e12e0  length 8000002a status 0001002a
  15: @ce5e12f0  length 8000002a status 0001002a
eth0: Resetting the Tx ring pointer.

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