analysis of abnormal cable attenuation in the area network
from：guichao author：admin click： 328 addtime：2017-04-19 18:08:53
abnormal signal attenuation is that the signal has been transmitted online,
however, the strength of this signal is reduced.
there are many reasons for this problem,
main line connection is bad or the cable is too long.
the following table is a technical specification for the specific length of the cable.
this is the maximum length of various connection standards.
remember these standards,
if your cable connection does not exceed this standard,
you still have problems with signal attenuation,
you need to check the cable itself.
the problem of signal attenuation caused by any unnatural bending or improper terminal.
ethernet cable assembly
technical specification cable type maximum length
10baset unshielded twisted pair 100 m
10base2 fine coaxial cable 185 meters
10base5 thick coaxial cable 500 meters
10basef fiber 2000 meters
100baset unshielded twisted pair 100 m
100basetx unshielded twisted pair 220 m
for unshielded twisted pair,
crosstalk can cause serious problems and signal attenuation.
when the isolation between two signals or the barrier decreases
will produce interference in the signal of two pairs of cables,
so there's a crosstalk.
crosstalk occurs when the same cable is used for multiple connections.
the standard organization calls this phenomenon short circuit.
in cat 5e and cat 6 cable,
there are four pairs of lines in this terminal.
for some connections,
i've seen a data connection using only two pairs of lines.
the other two pairs are used for other data connections.
this connection method is indeed a problem.
when the signal is transmitted on these lines,
when the signal meets a noisy signal on another line,
crosstalk occurs.
if the cable is laid right,
crosstalk and abnormal signal attenuation will not occur.
use the correct wiring method and note the details,
high transmission frequency should not be a problem.
only poor quality connections and facilities will result in high transmission rates