A facility that (a) is manually operated by a call originator, (b) accepts selection signals from the call originator at an undefined, i.e., a nonspecific, data signaling rate (DSR), and (c) accepts signaling characters generated at the data terminal equipment (DTE) or at the data circuit-terminating equipment (DCE). See also  calling,  call,  originator,  character,  data circuit-terminating equipment,  data signaling rate,  data terminal equipment,  facility,  generate,  manual calling,  selection signal,  signaling.