Re: -48V pero supply design
Some of the standards you must fulfil could be :
ETSI EN 300 132-1, 2, 3., Power supply interface at the input to telecommunications equipment;
ETSI EN 300 253, Environmental Engineering (EE); Earthing and bonding of telecommunication
equipment in telecommunication centres.
EN 41003, Particular safety requirements for equipment to be connected
to telecommunication networks".
ETSI EN 300 386-1,EMC requirements
…..
The ETSI standards could you find at
https://www.etsi.org for download free of charge
And as usual EN60950, LVDS and more…