Grass Valley Apex v.2.0 - Manual (Page 124)

126 APEX — Installation and Service Manual
Glossary
2. On the MC 3020L Linkage panel, the
LOCK button is used to prevent any inter-
ruption 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 switch-
er 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 activ-
ity, including switches, machine control com-
mands, configuration set downloads, error
messages, etc. Each file covers a twenty-four
hour period.
LOS
Loss of Signal.
M
MADI
Multiplexed Audio Digital Interface. Inter-
face bus used in Dune switchers.
matrix bus
see CROSSPOINT BUS .
MDI
Multiple Document Interface.
MIDI
Musical Instrument Digital Interface. Serial
interface bus used in Triton switchers.
mnemonic
Abbreviation, usually four characters long,
for a particular input or output. Mnemonics
appear in the LED status windows of the
control panels. However, the term is some-
times used to define an input or output in the
sense of a logical device name.
MPK
Message-per-keystroke. Protocol developed
by Thomson for control panels and devices
connected to the Jupiter Serial bus. Baud rate
is variable, with 8 data bits, 1 start bit, 1 stop
bit, and even parity; time out is 6 characters
(1.72 msec). See also
SERIAL BUS .
N
node
Device on a network, such as a controller
board, control panel, file server, or VTR.
numeric mode
Switcher selection method using input and
output numbers only (as opposed to catego-
ry/number mode).
numeric set
Factory-supplied configuration set used to
set up and operate the routing switcher in the
minimum possible time.
O
OPM
OUTPUT MONITOR .
override
One-button selection of an input. Override
button of a control panel is programmed to
select a particular input that is used heavily.