This study presents the development and evaluation of a quantized cooperative salvo guidance law designed to achieve simultaneous attacks on stationary targets under communication bandwidth constraints. A novel joint design methodology for encoders, decoders, and guidance laws is proposed, effectively overcoming cooperative guidance challenges in time-varying directed topology with limited bandwidth. This approach identifies the minimum bandwidth requirements for executing salvo attacks and provides valuable insights into the trade-offs between communication resource allocation and operational effectiveness. The method is systematically extended to two-dimensional cooperative guidance in fixed directed topology and further adapted to three-dimensional cooperative guidance in time-varying directed topology, demonstrating its adaptability and scalability across different dimensions and network dynamics. Extensive simulations conducted in diverse operational scenarios validate the proposed guidance laws, showcasing their robust performance and practical feasibility.