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Old 12th Jan 2017, 6:58 pm   #11
julie_m
Dekatron
 
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
Default Re: BT Robin - Answering Machine 202A

I guess they were concerned that anything but an original PSU might invalidate the BABT approval of the answering machine, so avoided anything (like marking the voltage and polarity) that might encourage users to try substituting their own. Under the right (unlikely, but by no stretch impossible) combination of circumstances, a fault could damage the exchange -- or even other subscribers' equipment.
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