Private Integrated Services Network (PISN)
- Mapping Functions for the Employment of 64 kbit/s Circuit
Mode Connections with 16 kbit/s Sub-Multiplexing (Mapping/16)
2nd edition (September 2000)
This Standard defines the mapping functions in exchanges of Private
Integrated Services Networks (PISNs) required for the utilization
of scenarios in which 64 kbit/s circuit mode connections are sub-multiplexed
into 4 x 16 kbit/s channels for carrying inter-PINX signalling
and user information.
This Standard has been prepared to meet the specific needs of
an application for a particular user organisation. However, it
may also be applicable elsewhere. The requirements contained in
this Standard will be incorporated in any future standard specifying
a more generic approach to bearer conditioning.
In order to connect a Private Integrated Services Network Exchange
(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 timeslots at the C reference point.
The C and Q reference points are defined in ECMA-133.
The type of interface at the C reference point covered by this
Standard is the 64 kbit/s Unrestricted Digital Leased Line (D64U)
Terminal Equipment Interface, in accordance with ITU-T Rec. G.703.
At the Q reference point the mapping provides a 16 kbit/s service
for user channels to support the transfer of unrestricted digital
information and to support the transfer of speech, and a packet
mode service for the signalling channel. The applied mapping is
a static mapping, i.e. there is a fixed relationship between user
and signalling channels at the Q reference point and the interface
at the C reference point.
Management functions relating to failure management are outside
the scope of this Standard.
This Standard is applicable to PINXs that can be interconnected
to form a Private Integrated Services Network (PISN) and that
support signalling protocols at the Q reference point.
The following file can be freely downloaded:
||Acrobat (r) PDF file
This Ecma publication is also approved as ISO/IEC 17310.
The previous replaced "historical" edition of this Ecma Standard is available here.