请求帮助

大家好，有谁知道下面描述的是什么东东吗？我没做过这些不知道是什么？请求大家帮忙。这里先谢了！！
“Connection Transformer 75/120 OHMS - Dual Balum 2x1,6/5,6(F)
to RJ45,2-8Mbb/s, 75/1200Ohms Fully Shielded Circuicity
Complies with EMS requirements
Insertion Loss: less than -25dB
Interfaces two coaxial E1, 2Mbit/s Paths into RJ-45 socket
Specification for 2- 8 Mbit/s use
Provides 250V isolation from input to output terminals
Matching Impedances 75 to 120 Ohms ”

多谢大家了，我已经知道了