We study collisions in dispersion-managed soliton propagation for wavelength-division multiplexing application at zero net dispersion when the Gordon-Haus timing jitter is removed. We show that the collisions can lead to group-velocity changes and spectral collapse. Large channel separation ameliorates the effects.: Filters prevent spectral collapse but do not affect the velocity changes. (C) 1999 Optical Society of America OCIS codes: 060.2330, 060.4230, 060.4370.