ANSI T1.401.04:2000 pdf free.Network to Customer Installation Interfaces一 Analog Voicegrade Switched Access Lines with the Call Waiting, Distinctive Call Waiting, or Calling Identity Delivery on Call Waiting Feature.
3.1.5 Calling Identity Delivery on Call Waiting (CIDCW): A supplemental feature provided with the Calling Number Delivery (CND), Calling Name Delivery (CNAM), or both the CND and CNAM features that provides a called CI, that is off-hook in the communications state of an originating or terminating call, with a Call Waiting tone or a Distinctive Call Waiting tone to indicate that an incoming call is waiting to be answered, followed by a Cl alerting signal to alert the CPE of a data message containing CND, CNAM, or both CND and CNAM information. The network-originated data message provides the number, name, or number and name associated with the switched access line that originated the call and is waiting to be answered. The feature is described more fully in clause 4.
3.1.6 Calling Name Delivery (CNAM): A supplemental feature that provides the called Cl with the date and time of the call, and a name that is associated with the switched access line from which the call originated.
3.1.7 Calling Number Delivery (CND): A supplemental feature that provides the called Cl with the date and time of the call, and the directory number associated with the switched access line of the calling Cl.
3.1.8 Call Waiting (CW): A supplemental feature that provides a called Cl that is off-hook in the communications state of an originating or terminating call with an alerting signal (i.e., a CW tone) to indicate that an incoming call is waiting to be answered. The feature is described more fully in clause 4.
3.1.9 Call Waiting tone: A nominal 440-Hz tone that is provided by the network to switched access lines with the CW or CIDCW feature to alert the Cl of an incoming call that is waiting to be answered. When the CW tone is provided with the CIDCW feature it is sometimes referred to as a subscriber alerting signal.
3.1.10 carrier: An organization that provides telecommunications services to customer installations..
3.1.11 checksum: A word appended to a message to enable the receiver to detect any error in the transmitted signal.
3.1.12 Customer Installation (Cl): All cabling and equipment on the customer side of the network interlace.
3.1.13 Customer Installation Alerting Signal (CAS): A signal that is sent to the Cl by the network to alert CPE to forthcoming network-originated off-hook data transmission.
3.1.14 Customer Premises Equipment (CPE): Telecommunications equipment located at the customer installation on the customer side of the network interface.
3.1.15 data word or word: An eight-bit byte.
3.1.16 disconnect signal: An on-hook signal of a defined duration (see Tl.401) used to request the network to release the switched communication path.
3.1.17 distinctive alerting: Special ringing or Call Waiting tone patterns generated by the network to convey information to the Cl about the called number, the calling number, or the status of an automatic call request. (For more information, see Ti .401.02.)ANSI T1.401.04 pdf download.