  Cosmic string networks generate cosmological perturbations actively
throughout the history of the universe. Thus, the string sourced anisotropy of
the cosmic microwave background is not affected by Silk damping as much as the
anisotropy seeded by inflation. The spectrum of perturbations generated by
strings does not match the observed CMB spectrum on large angular scales
(l<1000) and is bounded to contribute no more than 10% of the total power on
those scales. However, when this bound is marginally saturated, the anisotropy
created by cosmic strings on small angular scales l>2000 will dominate over
that created by the primary inflationary perturbations. This range of angular
scales in the CMB is presently being measured by a number of experiments; their
results will test this prediction of cosmic string networks soon.
