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Fitting new cable to the bit before the master phone socket |
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#26 |
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Forum Member
Join Date: May 2008
Location: Lancashire
Posts: 8,253
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Quote:
The idea of the master socket is, customers CAN add their own stuff (providing uk telecom approved). Hence, the protector in master socket. Prior to that. the only plug & socket stuff was some key & lamp units with 4 wire BT jacks (NOT PO jacks!). And commercial PABXs of course ......
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#27 |
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Join Date: Jul 2010
Posts: 24,096
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The basic idea of the rj plug is, various approved devices may be connected in parallel to line, as customer desires.Hence, some form of protection is required.
Under the older system domestic premises were directly hardwired to the junction box, and commercial premises had limited scope plugging arrangements, |
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