The MSC network and routing
The following topics explain the concepts necessary for MSC administration.
Remote and local systems
In an MSC network, a
local system
refers to a specific IMS where a message is entered. All other IMS systems are considered
remote systems
in regard to the specific local system.
Flow of data within multiple systems
The flow of a transaction in an MSC network requires additional steps as compared to one IMS.
Message routing
The message-routing function of MSC supports several types of message routing.
Routing path
IMS passes messages from the local system to the remote system on a routing path. One or more IMS systems can be included in a routing path.
Logical destinations
Message routing for an MSC network uses logical destinations, as does a single-system environment.
Input, destination, and intermediate systems
Depending on the message, an IMS can be either an input system, a destination system, or an intermediate system.
System identifiers (SYSIDs)
MSC uses system identifiers (SYSIDs), two-byte numbers between 1 - 2036, to identify the IMS systems in an MSC network.
Routing messages with the destination name and SYSIDs
Messages in an MSC network contain information that makes it possible to route the message between IMS systems.
Remote LTERMs
A
remote LTERM
is a logical terminal that does not reside on the local system.
Multiple Systems Coupling (MSC) directed routing
MSC directed routing
is a function of MSC that allows an application program to specify the IMS name (MSNAME) and destination within that IMS for a message to an LTERM or an application program.
Remote destination verification
To maintain system integrity and prevent errors, an IMS in an MSC network verifies all specified destinations, unless MSC directed routing is used.
Parent topic:
Overview of Multiple Systems Coupling