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Characteristics
Technical information
Ethernet network
Infrastructure
Distance limitations and number of devices per segment
Based upon the 802.3, the distance limits and the numbers of devices in cascade are the following:
Type
Maximum segment
length
(1)
Maximum segment
length
(
offered by
ConneXium devices)
Maximum number of
hubs in cascade
Maximum number of
switches in cascade
10
BASE-T
100
m
100
m
4
Unlimited
100
BASE-TX
100
m
100
m
2
Unlimited
1000
BASE-T
100
m
100
m
–
Unlimited
10
BASE-FL
2000
m
3100
m
(2)
11 (
fiber ring)
–
100
BASE-FX
412
m/2000 m
4000
mwith multimode
fiber, 32.500 mwith
monomode fiber
(3)
–
Unlimited
1000
BASE-SX
275
m
–
–
Unlimited
(1)
Based on 802.3, full duplex/half duplex.
(2)
Depends on the optical fiber budget and fiber attenuation.
(3)
Depends on the optical fiber budget and fiber attenuation, typical specification is 2 km for
multimode and 15 km for monomode.
Physical Media
The Ethernet 802.3 defines the Physical Layer. A summary of the most common ones are shown below:
Type
Data rate
Cable type
Connector type
Defined by 802.3
Recommended by
Schneider Electric
Defined
by 802.3
Recommended by
Schneider Electric
10
BASE-T
10
Mbit/s
CAT 3 - UTP
CAT 5E - STP
RJ45
RJ45
100
BASE-TX
100
Mbit/s
CAT 5 - UTP
CAT 5E - STP
RJ45
RJ45
1000
BASE-T
1
Gbit/s
CAT 5 - UTP
CAT 5E - STP
RJ45
RJ45
10
BASE-FL
10
Mbit/s
Two multimode fiber optic
cables typically
62.5/125
μm fiber,
850
nm light wavelength
Two multimode fiber optic
cables typically
62.5/125
μm fiber,
850
nm light wavelength
ST
ST
100
BASE-FX
100
Mbit/s
Two multimode optical
fibers typically
62.5/125
μm multimode
fiber,
1300
nm light wavelength
Two multimode optical
fibers typically
62.5/125
μm multimode
fiber,
1300
nm light wavelength
ST
SC
–
Two monomode optical
fibers typically 9/125 μm
multimode fiber,
1300
nm light wavelength
–
SC
1000
BASE-SX
1
Gbit/s
Two 62.5/125 or 50/125
multimode optical fibers,
770
to 860 nm light
wavelength
Two 62.5/125 μm or
50/125
m multimode
optical fibers ,
1300
nm light wavelength
SC
LC
1000
BASE-LX
1
Gbit/s
–
Two 9/125 μm monomode
optical fibers,
1300
nm light wavelength
–
LC
Nota :
The above are the specifications defined by IEEE 802.3. However some of the cables are
no longer being developed. For instance, for 10BASE-T and 100BASE-TX, a CAT-5E cable is
used.
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