Draft Level—Hitachi Confidential

HiSpeed Switch Troubleshooting GUide

Physical Media Specifications

10BASE-5

10BASE-2

10BASE-TX

10BASE-FX

(Unshielded Twisted

(Thick Coaxial cable)

(Thin Coaxial cable)

(Fiber Optical Link)

Pair-UTP)

 

 

 

Max. stations per segment

Max. segment length

Connector type

Cable type

1024

1024

1024

1024

500 meters

185 meters

100 meters

200 meters

DB15 AUI

BNC

STAR

STAR

RG-11

RG-58

Cat 3 or 5

62.5/125 mm

 

 

 

or 9/125 sm

Common Ethernet Errors

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/

Frames smaller than the minimum Ethernet frame size of

runts

64 bytes a.k.a. ‘runts’. Presumed to be a fragment

 

resulting from a collision.

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Doc Part Number, Version Number

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Hitachi US7070447-001 manual Physical Media Specifications, Common Ethernet Errors

US7070447-001 specifications

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