Question 15/XI - Guidelines for implementing Signalling System No. 7 in
national networks

Considering

(a) that rapid developments in digital technology, together with demands
for a broad range of advanced communications services, have resulted in
a shift from analogue to digital networks;

and that this trend is being carried further to create a multi- media
integrated digital network which transmits voice characters, data, video
images, facsimile, etc.;

(b) that the implementation of Signalling System No. 7 is particularly
significant as it can be used in the circuit switched public data
network (CSPDN) and in the public switched telephone network (PSTN);

(c) and that the procedures for implementing data and voice networks may
not be applied to CCS networks, so that there is a need for advice by
the CCITT on procedures for implementing CCS in the transition from
analogue to digital networks,

What guidelines can be given on the following aspects of Signalling
System No. 7 implementation:

1) routing techniques in CCSS No. 7 networks;

2) implementation of communication procedures with network management
centres;

3) implementation of interconnection between CCSS No. 7 networks and
public data networks;

4) signalling network topologies for the different hierarchical levels
in a national network;

5) possible constraints due to delay in the signalling network for real
time applications;

6) signalling network performance;

7) software aspects of CCSS No. 7?