ANSI T1.401.04:2000 pdf free download – Network to Customer Installation Interfaces – Analog Voicegrade Switched Access Lines with the Call Waiting, Distinctive Call Waiting, or Calling Identity Delivery on Call Waiting Feature
The CW feature provides a customer installation (CI), that is off-hook during the communications state of an originating or terminating call, with a CW tone to alert the CI that an incoming call is waiting to be an- swered. The CI can place the current call on hold and answer the incoming call by generating a flash sig- nal. The DCW feature is provided on switched access lines that also have a supplemental feature that pro- vides distinctive ringing patterns for some incoming calls. The DCW customer may specify a list of tele- phone numbers that will initiate the DCW feature when calls are received from those switched access lines. The DCW feature provides a CI, that is off-hook during the communications state of an originating or terminating call, with a DCW tone pattern, if the call that is waiting to be answered is from a switched access line that matches a telephone number on the DCW list, to alert the CI that an incoming call is waiting to be answered. The CI can place the current call on hold and answer the incoming call by gener- ating a flash signal. The CIDCW feature is provided on switched access lines that have the CW or DCW feature and a Calling ldentity Delivery feature such as the Calling Number Delivery feature or Calling Name Delivery feature, or both the Calling Number Delivery and Calling Name Delivery features. The CIDCW feature provides a CI, that is off-hook during the communications state of an originating or terminating call, with a CW tone fol- lowed by a CI Alerting Signal and a network-originated data message or a DCW tone pattern followed by a CI Alerting Signal and a network-originated data message when an incoming call is waiting to be an-swered. The data message delivers the caller’s identity, that is, the caller’s number, the caller’s name, or the caller’s name and number. The CI can place the current call on hold and answer the incoming call by generating a flash signal. The CI that receives CIDCW information can normally display, print, or store the information, however, such capabilities are outside of the scope of this standard. The use of the CW, DCW, or CIDCW supplemental features with Integrated Services Digital Network (ISDN) access lines is beyond the scope of this standard. The features described in this standard may not be available on switched access lines that uilize ground- start signaling. Requirements in this standard are specified at the interface between telecommunications carriers and customer premises cabling and equipment. In this standard, the telecommunications carrier network is referred to as the network and customer premises cabling and equipment is referred to as the customer installation (CI). The interface between the network and the CI is referred to as the Network Interface (NI). The signals that the network presents at the NI are basically of two types: normal telecommunications system voltages and currents, and voltages and currents due to maintenance activities. The normal sig- nals are specified in this standard. Voltages and currents due to maintenance activities and abnormal voltages and currents that are the result of the environment (e.g., induced voltages and currents or light- ning) are not covered in this standard. Tariffs, contracts, or regulatory acts in various jurisdictions may contain additional or more stringent re- quirements than those in this standard.