According to the planning applications, these are "All-In-One" cabinets that will provide FTTC access ("superfast fibre") to Exchange-only lines.
Planning applications for three cabinets submitted 23 June 2016:
South Shian road opp. Ardbhatan
Barcaldine opp Bonawe road
planning application references:
HI Enterprise suggested in Jan 2016 that 4 cabinets for Benderloch area were planned.