Cisco CON-L1SW-LICVCSO 7900 Phone Power Transformer

Provide a dedicated external power transformer for Cisco 7900 Series IP phone installations. A transformer supplies the power-conversion function required by compatible telephone hardware, placing the power component outside the phone itself. This role matters in voice deployments where the phone installation uses a separate local power arrangement. Cisco CON-L1SW-LICVCSO is described as an IP phone power transformer for the 7900 phone series. It is intended for the telephone power path rather than for network connectivity, call processing, or handset operation. Keep the transformer requirement separate from the phone, Ethernet connection, and any site power-delivery method when defining the physical installation. Use this component where a Cisco 7900 Series phone deployment calls for an external transformer. Its stated compatibility with the 7900 phone series is the key selection detail: it is associated with IP phone power support, not a general-purpose network accessory. The product description does not establish electrical ratings, connector details, cable inclusion, or compatibility outside the named phone series, so those factors should match the requirements of the installed phone equipment.