Common channel signaling (CCS) is a digital communications approach that offers simultaneous transmission of user data, signaling data, along with other related traffic throughout a network. For second generation wireless communications systems, CCS is utilized to pass user data and control/supervisory signals between the subscriber and the base station, between the base station and the MSC, and even between MSCs. The concept of CCS implies dedicated, parallel channels; it is implemented in a TDM structure for serial data transmissions.