Open Core Protocol International Partnership (OCP-IP) introduced the Transaction Generator (TG). The tool is a transaction level (TL) SystemC simulator for benchmarking network-on-chips (NoCs) used in multiprocessor system-on-chip (SoC) applications. The Transaction Generator speeds the simulation of large systems. The results obtained at this higher level can be accurately used as an initial estimate in selecting and fine-tuning NoCs. The tool is freely available to both OCP-IP members and non-members alike through GNU LGPL.