5 x BT to RJ45 PABX Master Telephone Phone Socket Adaptor Converter PBX
these are used to route telephone lines through network cables it has a built in capacitor for bell ringing and line surge suppressor
I opened one so you can see what is inside
It has a RJ45 socket at one side and a British telecom socket at the other.
shelf BC4 part number 32030R
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