PLM Series Operation Manual
61
Term
Description
Termination
AES/EBU 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 such as PLMs, and ‘off’ at any intermediate ones.
Topology
A fancy mathematical word for “arrangement” or “configuration”. The topology of a network is a means of visualizing the overall
configuration of the network.
Unbalanced
Analog audio is often transmitted between equipment in unbalanced form – as in a home stereo system. Although the PLM’s analog inputs
are balanced, it may be necessary to use an unbalanced connection if the source itself has an unbalanced output.
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 amplifier channel if necessary.
View
The information available in the front panel display’s Meter mode is split into three pages which are termed Views.
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.
Warning
A Warning in the PLM occurs when one of the PLM’s operating parameter approaches a pre-determined safety level. Warning conditions
are indicated by yellow LED indications in the front panel display.
Wireless access point
A device used to connect an Ethernet network to another computer without cables. Think of it as a radio transmitter/receiver for data.
Wireless network
An Ethernet network where some or all cabled connections are replaced by wireless links.
XLR
Industry-standard 3-pole latching connectors for both analog and AES/EBU digital audio.
Table 11-3: Glossary of Terms
Figure. 12-1: Example I/O Connector Panel
APPENDIX 11
