I don't believe these FTTC designs use anything over a 48 volt power supply but in larger equipment installations batteries often provide mains voltage through inverters.
My understanding is that the batteries, in both the
Huawei and
ECI equipped cabinets, "float" directly across the DC output of the mains PSU (and thus also act as smoothing capacitors). In the UK FTTC deployment, the only power input to the
MA5616 or
M41 MSANs is -48V DC. (Positive earth is the long established standard of the entity that is know as
Beattie.)
In that case of the
Hauwei MA5616, it can be fitted with different power supply units. There are at least three types: (1) AC mains input via an
IEC (kettle) connector only (2) DC input via screw terminals only (3) Both AC mains and DC input. (Images are attached, below.)
In addition the electronics cards will probably be classed as static-sensitive components which require the operative to wear a grounded anti-static wrist band.
The
Huawei MA5616 has a quite prominent connector, to which an anti-static wrist band can be attached, on its cooling fan assembly.
Back to the original mini PCP discussion, there are a few even smaller metal posts around this patch I'm guessing about 150 mm high, 60 mm wide and 40 mm deep.
I'll put a tape measure in my wheelbarrow to satisfy curious pussies soon !
Thank you,
Walter. Every little helps!