Grass Valley NV9000-SE v.3.0 - Manual (Page 477)

NV9000-SE Utilities • User’s Guide 457
16. Tielines
The NV9000-SE features tielines, a powerful tool that enables routing between physical levels on
routers. Signals are routed between devices that share a common virtual level, but not between
physical levels. (See
About Levels and Level Sets on page 112.) Without a tieline, signals cannot be
routed between different physical levels. Using the tielines tool, a port on one router can be mapped
to a port on another router. A single port can be mapped to several ports, however several ports can-
not be mapped to multiple ports. This is true in either direction: upstream to downstream, or down-
stream to upstream. Tielines can be overridden at the control panel.
Figure 16-1. Illustration of Tieline Mapping Between Ports
Tielines have three basic functions:
• No signal conversion — Connect two routers without signal conversion. Signals from one router
are routed to another router “as is.”
• Signal conversion — Send a signal from a router to a conversion tool, such as a signal embed-
der, and then route the signal to another router or back to the source router.
• Fan out/Fan in of audio channels — Break out audio channels sent from a source (router or
audio stream) to a disembedder and forward to multiple devices (or the reverse sequence).
There are several concepts used in NV9000-SE that refer to different ancillary tieline features:
• Costs
Tielines can use whatever route is designated. The actual cost of using this route can vary from
tieline to tieline. For example, one tieline may use satellite to route between physical levels,
which is more costly than using another tieline that utilizes optical cables. NV9000-SE enables
you to enter a numeric value that represents the cost of the tieline. The lower the number, the
less expensive the cost of using the route mapped in the tieline. In turn, this allows the most
economical tieline to be used when available.
Costs must be integers (do not use decimals, slashes or commas, or other punctuation marks)
and do not need to be actual monetary amounts, but any representative number. Negative num-
bers (i.e., –1, –2) may be used as well as positive numbers (i.e., 1, 2).
Yes No
One port can be mapped to
multiple ports, but multiple
ports cannot be mapped to
multiple ports.