The 3Com MSR 50 G2 Multi-Service card (MSCB) module hosts service-enabling processor engines such as Enhanced Services Modules (ESM) and Voice Co-Processing Modules (VCPM).The MSCB is a high performance multi-service module with expansion bays for voice processing and encryption acceleration. Two ESM bays provide support for multiple network data encryption accelerators, either standard or advanced versions to provide increased encryption throughput.