ANSI T1.401.04-2000 pdf 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 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 utilize groundstart 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 lightning) are not covered in this standard. Tariffs, contracts, or regulatory acts in various jurisdictions may contain aditional or more stringent re- quirements than those in this standard.
1.2 Purpose
The purpose of this standard is to assist manufacturers, and users of products to be connected to the network to understand the characteristics of carrier networks when the CW, DCW, or CIDCW supplemental feature is provided on an analog voicegrade switched access line that uses loop-start signaling. The interface requirements may be useful in minimizing incompatibility problems although this standard is not intended to be an equipment specification.
1.3 Application This standard is applicable to network-to-customer installation interfaces for analog voicegrade switched access lines with loop-start signaling and either the CW, DCW, or CIDCW feature. This standard may also be applicable to certain network- to-network interfaces. In this situation, by mutual agreement, one of the networks shall meet the network specifications of this standard and the other network shall meet the customer installation specifications of this standard.
Availaility of the supplemental features described in this standard depends upon the network equipment serving the NI. These supplemental features may not be available on all loop-start switched access lines. For example, the CIDCW feature can only be provided if the network switching system serving the CI is a stored program control switching system (SPCS) that has CIDCW capability. Also, for interswitch calls, the CIDCW feature requires common channel signaling between network switching systems in order for the terminating SPCS to receive the number or name associated with the calling switched access line. When one of the features described in this standard is provided on a switched access line, other supplemental features may not be available on the same switched access line. (See 4.1.3 for examples.)