What is the difference between an RJ45 socket with a network filter and one without?

The common point is that they all use the same characteristic elements R, C, L to design, signal filter and power filter is essentially no difference, just through the modulus of power is different, because signals are energy. The main difference should be filtering efficiency or insertion attenuation: the ratio of the output and input moduli, usually expressed in decibels. The function of the network filter is to allow the signal of one part of the frequency to pass smoothly, while the signal of the other part of the frequency is greatly suppressed. In the filter, the signal can pass through the frequency range, called passband or passband; conversely, the signal by a large attenuation or completely suppressed frequency range called stopband; The boundary frequency between passband and stopband is called cut-off frequency, the voltage gain of ideal filter is constant in passband and zero in stopband There is a transition band between the passband and stopband of the practical filter. The network transformer includes: T1E1 Isolation Transformer, ISDNADSL interface transformer, VDSL high-pass low-pass filter module, interface transformer, T3E3, SDH, 64KBPS interface transformer, 10100base, 1000BASE-TX network filter, t1000base-t10 network transformer, t1000base-t10 network transformer, t1000base-t10 network transformer, t1000base-t10 network transformer, t1000kbps network transformer, t1000kbps network transformer, t100kbps network RJ45 integrated transformer; also according to customer needs to design special transformer. Products are mainly used in: high-performance digital switches; SDH/ATM transmission equipment; ISDN, ADSL, VDSL, Poe power equipment integrated services digital equipment; FILT fiber loop equipment; Ethernet switches and so on.