This International Standard is a part of the functional requirements for the Private Integrated Services Network (PISN) and defines the functions and procedures that are required by Private Integrated Services Network exchanges (PINXs) and the intervening network (IVN) in order to establish Inter-PINX Connections (IPC). The IPC is used for the transfer of signalling and user information between PINXs.
The Private Signalling System No.1 (PSS1) as defined in ISO/IEC 11572 and 11574 defines the signalling procedures and protocol for call control between PINXs at the Q reference point. These procedures are independent of the types of IVNs, called scenarios used to interconnect the PINXs. ISO/IEC TR14475 describes the use of various types of IVNs which provide the interconnections of PINXs.
In order to connect a PINX to another PINX, mapping functions are required to adapt the specific interfaces at the C reference point to the application at the Q reference point. As such, mapping functions provide for physical adaptation to the interface at the C reference point. Mapping functions also provide for the mapping of user channels and signalling information at the Q reference point to the appropriate channels or time-slots at the C reference point. The C and Q reference points are defined in ISO/IEC 11579-1.
The types of interfaces at the C reference point covered by this International Standard are:
1544 kbit/s unstructured digital leased line
1544 kbit/s structured digital leased line
2048 kbit/s unstructured digital leased line
2048 kbit/s structured digital leased line
64 kbit/s unrestricted digital leased line
1544 kbit/s ISDN Primary Rate user-network layer 1 interface 2048 kbit/s ISDN Primary Rate user-network layer 1 interface ISDN Basic Rate user-network layer 1 interface
At the Q reference point the mappings provide a 64 kbit/s service for user channels and a packet mode service for the signalling channel. (...abbreviated)