帮忙看看 Max Ringer Load 5 REN(North Americal)
REN怎么译?
5 REN
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这里有详尽的解释:
The ringer in the telephone presents a load that is an impedance made up
of a resistive part and a capacitive part. This impedance is called the Ringer
Equivalence Number or REN.
In the US, 1 REN = 6930 ohms in series with 8uF. The
resistive part is from the coil in the ringer and the capacitive part is from
the blocking capacitor. If two 1 REN phones are both connected to the same line,
together they present a load of 2 REN which is 6930 ohms / 2 and 8uF * 2 or
2 REN = 3465 ohms + 16 uF.
In Europe, 1 REN is defined differently as 1800 ohms +
1uF. As well, the ringing frequency is 25 Hz instead of 20 Hz. US Bellcore specs
call for the central office (CO) line card to be able to drive 5 REN (= 1386 ohms
+ 40uF) to at least 40 Vrms for ringing.
The ringer in the telephone presents a load that is an impedance made up
of a resistive part and a capacitive part. This impedance is called the Ringer
Equivalence Number or REN.
In the US, 1 REN = 6930 ohms in series with 8uF. The
resistive part is from the coil in the ringer and the capacitive part is from
the blocking capacitor. If two 1 REN phones are both connected to the same line,
together they present a load of 2 REN which is 6930 ohms / 2 and 8uF * 2 or
2 REN = 3465 ohms + 16 uF.
In Europe, 1 REN is defined differently as 1800 ohms +
1uF. As well, the ringing frequency is 25 Hz instead of 20 Hz. US Bellcore specs
call for the central office (CO) line card to be able to drive 5 REN (= 1386 ohms
+ 40uF) to at least 40 Vrms for ringing.
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@楚雄
这里有详尽的解释:Theringerinthetelephonepresentsaloadthatisanimpedancemadeupofaresistivepartandacapacitivepart.ThisimpedanceiscalledtheRingerEquivalenceNumberorREN. IntheUS,1REN=6930ohmsinserieswith8uF.Theresistivepartisfromthecoilintheringerandthecapacitivepartisfromtheblockingcapacitor.Iftwo1RENphonesarebothconnectedtothesameline,togethertheypresentaloadof2RENwhichis6930ohms/2and8uF*2or2REN=3465ohms+16uF. InEurope,1RENisdefineddifferentlyas1800ohms+1uF.Aswell,theringingfrequencyis25Hzinsteadof20Hz.USBellcorespecscallforthecentraloffice(CO)linecardtobeabletodrive5REN(=1386ohms+40uF)toatleast40Vrmsforringing.
谢了,老兄
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