Cabletron Systems 100BASE-FX, Cabling Manual

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Ethernet Network Requirements
5-4 10BASE-F (Multimode)
The IEEE 802.3 10BASE-T specification requires that all 10BASE-T devices
support UTP cables of not less than 100 m (328 ft) in length. This requirement
does not factor in losses due to connectors, patch panels, punchdown blocks, or
other cable management hardware, which introduce additional loss.
For each connector or other intrusive cable management device in the total link,
subtract 12 m (39.4 ft) from the total allowable link length.
Length
The 10BASE-T standard specifies that any 10BASE-T compliant device must be
capable of transmitting an Ethernet signal not less than 100 m (328 ft) over a UTP
cable segment that meets the minimum quality values listed above. As long as all
specifications are met for the entire length of the cable, UTP cable segments can be
run up to a maximum allowable length of 200 m (656 ft).
10BASE-F (Multimode)
All Cabletron Systems 10BASE-F and FOIRL products require that installed
facility cabling and cable hardware meet the following minimum specifications. If
a network cabling installation is not within the limitations presented here, the
operation of the 10BASE-F products may be affected.
Cable Type
10BASE-F network devices require specific types of cabling. 10BASE-F multimode
fiber optic devices manufactured by Cabletron Systems are able to support
connections to and from the following types of multimode fiber optics:
• 50/125
µ
m
• 62.5/125
µ
m
• 100/140
µ
m
NOTE
As longer cables are more susceptible to noise and other
limiting factors, Cabletron Systems does not recommend the
installation of 10BASE-T cabling over 100 m in length.