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HiSpeed Switch Troubleshooting GUide
9-2
Doc Part Number, Version Number
Draft Level—Hitachi Confidential
Ph
y
sical Media Specifications
Common Ethernet Errors
10BASE-5
(Thick Coaxial cable)
10BASE-2
(Thin Coaxial cable)
10BASE-TX
(Unshielded Twisted
Pair-UTP)
10BASE-FX
(Fiber Optical Link)
Max. stations per
segment
1024 1024 1024 1024
Max. segment
length
500 meters 185 meters 100 meters 200 meters
Connector type
DB15 AUI BNC STAR STAR
Cable type
RG-11 RG-58 Cat 3 or 5 62.5/125 mm
or 9/125 sm
collisions
Occurs when more than one device is transmitting
simultaneously. Collisions are considered to be ‘normal’
in an Ethernet environment. CSMD/CD is designed to
detect and correct for this.
late collisions
A collision detected after 64 bytes have been
transmitted. May indicate a malfunctioning NIC/cable, or
a network segment that has exceeded the maximum
length.
excessive collisions
The maximum number (16) of consecutive collisions
allowed between endstations contending for the wire.
Possibly caused by exceeding the maximum number of
users on a given segment, length of cable, or jabbering
NIC.
undersized frames/
runts
Frames smaller than the minimum Ethernet frame size of
64 bytes a.k.a. ‘runts’. Presumed to be a fragment
resulting from a collision.