1.5 Services
Router has two basic types of service: WAN Services and LAN Services.
Router Services describe the address of the service, an optional password,
and connection characteristics (via profiles). Each service has a name
which can be employed by users to connect to their required destinations.
•A WAN Service contains an X.121 address. Users can connect to the
service by two basic methods. The first allows the user to specify the
name of the service; the second is automatic, or seamless selection. This
occurs when an incoming LAN call is received with a TCP port that
matches the TCP port specified in the service. For example, it is possible
to configure a WAN service for access to a DEC system with a TCP port
of 100; when an incoming LAN call for TCP port 100 arrives, the TGate
automatically calls the configured X.121 address.
•A LAN Service contains a LAN socket address (IP address and TCP
port). Again, like the WAN service, this can be selected either by name
or automatically by an incoming X.25 call to Router's X.121 address.
When a call from an X.25 device arrives, Router automatically calls the
destination LAN address.
After a service is created, it must be enabled (a disabled service cannot
have a connection made to it). When enabling a service it is first checked
for any inconsistencies. If there are any, then the service will not be
enabled and the manager is informed of the error.
Both the LAN and WAN have special services to allow users to enter
dialogue. If the service is specified without a destination (e.g. LAN service
without IP address and TCP port), but has a specified incoming address (i.e.
X.121 sub-address for LAN services and TCP port for X.25 services), when
an incoming call matches this incoming address, Router will enter a
dialogue using the specified (or default) user profile. For example, if a
WAN service called LAN-DIALOGUE is configured with a TCP port of 23
but without an X.121 sub-address, then when an incoming LAN call for
TCP port 23 arrives, the user will enter a dialogue with Router. The
service can also be configured with a password, in which case, the user will
be requested to enter the password before entering the dialogue.
X870-300351 Issue 1 1-7 Rev.0
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