| 摘要 |
The routing functions are those system functions that are in charge of routing a call attempt toward its
destination on the basis of the data associated with the call attempt (e.g. the dialled digits, etc.) and the data associated
to the network (e.g. identities of the circuit sub-groups serving a certain destination, etc.). The destination of a call
attempt may be inside the switching system as well as outside the switching system. If the destination is inside the
switching systems, the routing will consist of identifying the termination that corresponds to the destination. If the
destination is outside the switching system the routing functions shall search for a free circuit, within a given circuit
sub-group on which the call attempt will be routed.
Routing consists of functions whose parameters may vary with the network design and the switching system
design to fit the network application. The economics of a switching system in a network application is, in part, a
function of how well the routing functions match the network design.
The main activities for creating and maintaining routing administration data may be summarized by the
following items:
- analysis of the data provided by the traffic measurement functions;
- defining the routing strategies on the basis of the achieved results;
- creating new or changing the existing items, related to the routing in the switching systems, in order to
satisfy the routing strategies.
Only the last of these items is within the scope of this Recommendation.
This Recommendation deals with the routing administration functions involved with the routing towards
destinations outside the switching system, whichever signalling system is used. |
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