Worked for an old ISP in 2012 (it started when the state owned telco was privatized). Also had the ctunnel to manage old SONET crap, still had modem pools running, racks full of purple Sun machines still running, vax, hpux, as400, etc. Even the old smsc that was 5 racks of dec servers was still there, was never removed as they didn't need the space because modern equipment was using all the available power anyway (was also in a mountain so a bit of a hassle to remove).