Calrec SUMMA User Manual page 192

Path
A generic term that refers to a DSP process in the system. A signal present at an input port must be routed to a path in
order for it to be processed and then sent back out of the system. Paths include channels, groups, auxs, tracks, mains,
talkback and monitor paths. Paths can be routed to other paths, for example a channel path can be routed to a group
path and a main path simultaneously.
PFL
Pre-Fade listen. A function to allow a signal to be heard before it has its level altered by a fader. Multiple PFL signals can
be sent to the PFL bus.
Port
A port refers to any physical audio input or output in a Hydra 2 I/O box. Ports can be of any form of analogue or digital
I/O. In the case of analogue signals, a single port relates to a single signal in the system. Where digital signals are
connected, multiple signals become available for each port. A single AES3 port provides two signals, SDI can provide up
to 16 signals (or more with Dolby E decoding) and MADI can provide up to 64 signals.
Preset
A preset is a complete copy of a path from which you can choose elements to load onto another path. Using presets can
speed up workflow when several paths with similar settings are required.
PSU Module
PSU module is a term used to describe a stand alone unit which is connected to a device in order to provide power inlets.
R
Redundancy
All main components of the system are redundant, meaning that there is always a secondary hot spare ready to step in
and take over control if the primary component fails. The failed primary unit can be replaced with a working unit which
then becomes the new hot spare, effectively re-introducing redundancy.
Rotary Controller
A knob which can be rotated, allowing variable control of a parameter. In some cases it can be pressed giving it extra
functionality. Each control cell contains a rotary controller.
Route
A route is a connection made from one path to another within the system. For example a Group may be routed to a Main,
or a Channel may be routed to an Aux via an Aux send.
Router Core
Processing rack without DSP mix engine, and therefore no control surface connected. Used to expand network capacity.
192 SUMMA TERMINOLOGY
Networked Audio Production System