Cisco offers a wide variety of connectivity, expansion and upgrade modules to accommodate the range of application needs in customer networks. The network modules assure customers that they can choose a connectivity solution that fits their requirements. As modular components, they are easily and inexpensively field-upgradeable as customer requirements change.This product package consists of one NM-HDV (High Density Voice/Fax Network Module Spare), four PVDM-12 (12-Channel Packet Voice DSP Module Upgrade), and one VWIC-1MFT-T1 (1-Port RJ-48 Multiflex Trunk - T1).