TOA Electronics Inc., South San Francisco, Calif., is expanding its complete line of video security products to include high capacity network DVRs, network video cameras and advanced surveillance control solutions. Two new models of network digital video recorders, the C-DR091 (9 channel) and C-DR161 (16 channel), offer several choices of high-capacity hard disk drives. A DVD recorder is available with both versions, allowing convenient data archiving and storage.