Grass Valley NV9000 Web Suite v.1.2 - Manual (Page 84)

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Tielines Tab
Background Information
Background Information
A tieline (or a “simple” tieline) is defined as a connection from an output of an upstream router to
the input of a downstream router:
Sources and destinations that are connected using tielines and that comprise multiple levels
(perhaps on different routers) must have a tieline connection on each of the applicable levels.
A multi-hop tieline is a set of simple tielines between multiple routers, perhaps at remote
geographical locations.
A tieline route is one taken from a source on an upstream router to a destination on a down-
stream router.
The NV9000 system uses tielines as a pool of resources. When the NV9000 needs to use a tieline
to perform a route, it determines all the tielines necessary to make the route. If the pool of
tielines is depleted, of course, it cannot make the route.
Fig. 4-1: Pooled Tielines
In Figure 4-1, there are no tieline paths from router 2 to router 3. If the NV9000 system cannot
find a tieline path for a route, it cannot make the route.
The tieline pages of the Web Suite show (1) the routes used by the tielines in your system and (2)
the tielines that remain unused. (The latter are shown greyed out.)
Output
Router 1 Router 2
Input
Tieline
Output
Router 1 Router 2
Input
• • •
Router n
Input
Output
Output
Router 1
Router 2
Input
Router 4
Input
Output
Router 3
Input
Output
Output
Input