Grass Valley VM 3000 System Controllers v.7.4 - Manual (Page 754)

Glossary−6
level − historically, a switcher matrix that carries one type of signal, as determined by DIP switch settings on
crosspoint boards. Example: level 1 for video, levels 2 and 4 for left and right audio, etc. However, in 3−stage
switching systems this switch−set level is referred to as the “physical” level; and large systems may require
more than one physical level to provide enough hardware for an entire “logical” level (such as video). The
Jupiter Physical Switching menu refers to a “logical level” that is actually the logical level number, this being
the row number on which the level is identified on the Switcher Level Descriptions table. The logical level
name also appears on this table.
linkage − the Jupiter machine assignment function, whereby control of a VTR is passed to a remote panel. The
system can be configured so that linkage will occur automatically, based on the signal from the VTR being
switched to a destination associated with that panel; this function is sometimes described as “machine control
following the router.” Linkage can also be accomplished manually, using the MC−3020L Linkage panel. See
also
DELEGATION .
Little Cloud − engineering project name for JUPITER XPRESS product.
lock − 1. on Jupiter control panels equipped with a LOCK button (except MC 3020L): after a given source has
been switched to a given destination, and LOCK is pressed, the source for that destination can then be changed
only at the panel which set the lock; and only after LOCK is pressed again. Note that a panel can only lock
LEVELS that are assigned to the panel during configuration. See PROTECT , and FORCE UNPROTECT/UNLOCK . 2. on
the MC 3020L Linkage panel, the LOCK button is used to prevent any interruption in the assignment of a
machine to a control panel.
logical level mapping - in these systems, the same physical level number can be used on more than one logical
level. For example, you could have a switcher with Left Audio on level 2, and with Right Audio also on level 2.
This technique can sometimes help reduce overall switcher size, but it requires special entries to control sys-
tem tables.
logical level name − see LEVEL .
logical level number − see LEVEL .
logging − maintaining a disk file of Jupiter LAN activity, including switches, machine control commands, config-
uration set downloads, error messages, etc. Each file covers a twenty−four hour period.
LOS − Loss of Signal.
MADI − Multiplexed Audio Digital Interface. Interface bus used in Dune switchers.
matrix bus − see CROSSPOINT BUS .
M board − CE 3000 Matrix Controller. Now obsolete.
MDI − Multiple Document Interface.
Media, Networking, and Control − see MNC .
MIDI − Musical Instrument Digital Interface. Serial interface bus used in Triton switchers.