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Site
Requirements
Note
We
recommend
that
you do
not
exceed
specified
transmission
rate
and
distance
limits
The
following
distance
limits
are provided
as
guidelines
for
planning
your network
connections
before
installation
Ethernet
Connections
The
maximum
distances
for Ethernet
network
segments
and
connections
depend
on
the type of
transmission
cable
used
0.4-inch
diameter
coaxial
1OBASE-5
0.25-inch
diameter
coaxial
1OBASE-2
or unshielded
twisted-pair
1OBASE-T
The
term
1OBASENis
an
abbreviation
for
10
Mbps
transmission
BASEband
medium
and
is
the
maximum
cable
length
in
hundreds
of
meters
Network
connections
to
the coaxial
cables
are tapped
into
network
segment and must be
spaced
at
specific
intervals
Table
2-1
lists
the
maximum
number
of connections
taps
per
segment and
the
intervals
at
which
they
must be placed
maximum
of four
repeaters
can be used
to
link
segments
in
single
network
Table
2-1
Ethernet
Coaxial
Connection
Limits for
1O-Mbps
Transmission
Parameter
1OBASE-5
1OBASE-2
Cable
diameter
0.4
in
cm
025
in 0.6
cm
Max
segment
length
1640
ft
500
656
ft
200
Max
connections
taps
per
segment
100
30
Mm
connection
tap
spacing
8.2
ft
2.5
1.64
ft
0.5
The
unshielded
twisted-pair
UTP
cabling
used
with
1OBASE-T
is
suitable
for voice
transmission
but
may
incur
problems
at
10-Mbps
transmission
rates
UTP
wiring
does
not require the fixed
spacing
between
connections
that
is
necessary
with
the coaxial-type
connections
IEEE
recommends
maximum
distance
of
328
feet
100
meters between
station
connection
and hub
for
1OBASE-T
connections
Fast
Ethernet
Connections
IEEE
802.3u
specifies
several
different
physical
layers
for
100BASE-T
among
them
are
100BASE-TX
which
is
100BASE-T
half
duplex
over
Category
unshielded
twisted-pair
UTP
Electronics
Industry
Association/Telecommunications
Industry
Association
EIA/TIA568-compliant
cable
100BASE-FX
which
is
100BASE-T
full
duplex
or half duplex
over
optical
fiber
and
100BASE-T4
which
is
100BASE-T
using
Category
or
UTP
or
shielded
twisted
pair
STP
cabling
with
four
pairs
100BASE-T4
is
also called
4T
or
72
which
is
2-pair
UTP
over
Category
cable
2-6
cisco
7513
Hardware
Installation
and
Maintenance
Содержание 7513 Series
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