FIG. 1 is a front, top, and right side view showing our new design for a telecommunication system enclosure;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is a bottom elevational view therof.

The broken lines of FIG. 3 are for illustrative purposes only and form no part of the claimed design.