This standard provides the specification for the interfaces which coincide with the? Reference Points ??A??@ ??Ater??@ ??Aquater??@ and ??Aquinter?? defined in the TR45 Network? Reference Model shown in [18].?The scope of this standard includes the following topics: ? MSC-BS and BS-BS interfaces: ? descriptions of the specified functional capabilities that provide wireless? telecommunications services across the MSC-BS and BS-BS interfaces as?defined in the TR45 Network Reference Model;?? descriptions of the division of responsibility of the functions provided between?the BS and the MSC@ and between the source BS and the target BS@ without?prescribing specific implementations;?? descriptions of the MSC-BS interface and the BS-BS interface standards that support DS-41 and cdma2000? systems. ? BS-PCF interfaces: ?? descriptions of the specified functional capabilities that provide packet data? services across the BS-PCF interface;?? descriptions of the division of responsibility of the functions provided between?the BS and the PCF without prescribing specific implementations. ? PCF-PDSN interfaces:?? descriptions of the specified functional capabilities that provide packet data?services across the PCF-PDSN interface;?? descriptions of the division of responsibility of the functions provided between?the PCF and the PDSN without prescribing specific implementations.?The interfaces defined in this standard are specified by a set of characteristics@ including:? physical and electromagnetic parameters;? channel structures;? message types and contents;? network operating procedures;? user data framing and transport.?