We stayed at the Syracuse Sheraton while chaperoning a Marching Band trip, which led to meals in the Regents Ballroom, a large space (potentially) divided in three parts by the usual folding partitions. The wall in each section had a bank of RJ-11 and -45 jacks…

Obviously, back in the day, a single room with 25 Phone jacks and one (red) Data jack made perfect sense. Or maybe the ballroom has 75 phones lines and three Data connections? Hard to say.
Judging from the overall crud accumulation, the jacks aren’t getting much use. I wonder if it was originally set up so they could run a boiler-room operation out of the hotel ballroom?