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Joined: Mar 2002
Posts: 157
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The 48's shorting bars are also used in the case of alarm systems connected ahead of phone systems where the line goes into the alarm system and back out to the phone system. With the shorting bars, you will not lose dial tone if the alarm device is unplugged from the jack.
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Joined: Jul 2003
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RJ48x has shorting bars for loop-back when unplugged.
RJ48c has none.
RJ48s is for data, like a 56k
RJ31x is used for alarms to put them in line ahead of the end user and to provide continuity when unplugged.
[This message has been edited by SST (edited April 08, 2004).]
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