Lab.gruppen PLM 20000Q - Manual (Page 90)

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Appendix
PLM Series Operation Manual rev 1.2.3
Term Description
PAL
An abbreviation for Power Average Limiter, PAL is proprietary Lab.gruppen circuit which provides additional amplifier protection. The
PAL ensures that the power drawn by the PSU from the AC mains does not exceed the mains breaker ratings.
Parallel
Two or more e.g. inputs which are wired together so that all inputs are connected to the same source are said to be paralleled. Signal
levels will be reduced if too many inputs are paralleled; in the case of AES3, this may result in a complete loss of audio.
Parameter
Any control function which can be adjusted by the user to one of several different values is termed a parameter. For example, input level,
gain, delay, and limiter threshold are all parameters.
Pass-Through Cable See Straight network cable.
PFC Power Factor Correction. PFC reduces current peaks on the lines and reduces the requirements placed on the mains distribution system.
Ping
Ping is a term coined by the IT industry to the procedure of sending a command over a network to a particular Ethernet device asking it
to confirm its identity and possibly reply with additional information. Thus an Lake device on the network can be pinged from the Lake
Controller; on receipt of the ‘ping’, the hi-intensity white LED on the front panel illuminates. Reverse pinging is also possible, whereby
the ping is instigated from Lake hardware device and a visual identification of the processor registers in the Lake Controller software.
Preset A complete frame configuration that is stored in the device hardware.
Primary Ethernet Port The Primary Ethernet port on the is the means of connecting the device to a network. See also Secondary Ethernet Port.
PSU
Abbreviation of Power Supply Unit. The PSU in any item of electronic equipment converts the AC mains into a set of internal DC voltages
which run the electronic assemblies themselves.
RJ45 RJ45 connections are the industry-standard connectors for Ethernet ports.
Router As far as networks of the type discussed in this manual are concerned, see Switch.
Secondary Ethernet Port
The Secondary Ethernet port can be used either as a daisy-chain output, repeating the network connection at the Primary port, or for the
connection of a separate second network for full redundancy.
Short Circuit Protection
A Lab.gruppen proprietary protective circuit designed to mute a channel when a short circuit is detected at its output terminals to
prevent damage to the device.
SpeakerSafe
Once activated, SpeakerSafe constantly monitors the voltage and current at the PLM’s outputs. Using Fingerprint data, the software
then calculates parameters such as voice coil and magnet temperatures, providing the operator with real-time performance monitoring.
See LoadLibrary.
speakON
An industrial-quality loudspeaker connector manufactured by Neutrik. 4-pole (2 speakers) and 8-pole (4 speakers) versions are fitted to
various versions of the PLM.
Star Topology
A network topology which uses a network switch to connect to individual Lake devices. Each device connects to one port on the switch
with its own cable, thus the network looks like a star when drawn as a diagram with the switch at the centre.
Straight Network Cable
A Cat-5/6 network cable with full pin-to-pin connections is called a straight network cable. Lake devices can connect to a network using
either straight or crossed network cables.
Subsystem
It is possible when working with large networked systems to store selected components of the system into a Subsystem. This is useful
if working on a tour that encompasses both large and mid-sized venues. The same core Lake Controller data can then be used for a
reduced number of Lake devices.
Super Module
A Super Module is a virtual construct that can be realized within the Lake Controller, allowing a set of Modules in different Frames to be
treated as a single Module.
Switch (Ethernet)
An Ethernet switch allows several Ethernet devices to be connected to a network using a star topology. More intelligent than the earlier
hubs which they now largely replace, they route packets of data only to the units for which they are intended, and also perform other
system housekeeping and control functions.
System Preset A class of Preset within the Lake Processing system, System Presets allow Module or Frame configurations and settings to be stored for
the entire network of LM 26 Processors, PLM Series and other legacy Lake devices.
Tablet PC A compact PC which uses a touchscreen instead of keyboard and mouse. The Lake Controller has been optimized for use on Tablet PCs.
Termination
AES3 digital audio interconnections must be correctly terminated for reliable operation. The 110 ohm terminations must be set ‘on’ at the
beginning and end of a set of daisy-chained digital audio equipment, and ‘off’ at any intermediate ones.
Topology A mathematical word for “arrangement” or “configuration”. The topology of a network is a means of visualizing the overall configuration
of the network.
Universal Power Supply
A power supply that operates in all countries, without the need for manual adjustment, as long as the voltage falls within the specified
range for the device.
VHF Protection
VHF protection is another amplifier safety circuit developed by Lab.gruppen. The presence of continuous HF audio can easily damage
loudspeakers, so the protection circuit monitors the output this, muting the power output channel if necessary
V peak Indicates the peak voltage of an audio signal. For a sinusoidal signal, the peak voltage = 1.414 x the RMS voltage, Vrms. Not to be
confused with peak-to-peak voltage (written V pk-pk), which = V peak x 2.
Vrms The RMS voltage of a signal. See RMS.
Wireless Access Point A device used to connect a computer to an Ethernet network without cables; a radio transmitter/receiver for data.
Wireless Network An Ethernet network where some or all cabled connections are replaced by wireless links.
Table 9-5: Glossary of Terms, Acronyms and Abbreviations