Partitions and levels, A note about machine control signals, Parti – Grass Valley CRSC v.3.2 User Manual
Page 123: Tions and levels, Partitions and, Levels
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CRSC
User’s Guide
AES ‘takes’ in a “mono” partition are not paired. Each AES channel is independent. The 16×16
router has 32 independent inputs and 32 independent outputs. The 32×32 router has 64
independent inputs and 64 independent outputs.
When an AES router is in synchronous mode, the video reference type appears in the ‘Refer-
ence’ column of the ‘Routers’ tab of the ‘View Router Crosspoints’ page (See
on page 71). If the router is in asynchronous mode, the word ‘None’ appears in
that column.
A Note About Machine Control Signals
Machine control routers operate in “machine control reverse” mode. “Machine control reverse”
means that the destination device is the controlling device (as opposed to the controlled
device).
Machine control signals operate according to a serial communications protocol called RS-422
(or EIA-422). Typically, control signals originate in an editing machine which sends commands to
playback devices. Commands include “rewind,” “skip to a certain frame,” “stop,” and so on.
A machine control signal is bidirectional, unlike video or audio. There is a command in one direc-
tion and a response in the reverse direction. Each end of the connection is therefore both an
input and an output. Machine control routers are point-to-point. When a machine control signal
connection is made, any prior connections of its input or output are first broken.)
Video, audio, and data signals flow continuously in a stream. Control signals occur asynchro-
nously and intermittently. See
Partitions and Levels
A router may be considered a switching matrix and that matrix can be partitioned into smaller
regions. The regions for doing so are many and varied. Partitions are boundaries that organize
switching.
A level is a the name given to a signal type. Because each CR Series router offers a single signal
type, the term level is often equivalent to the term router. If a router has more than one parti-
tion, the term level is equivalent to a router partition. And even if the router has only one
partition, we say that the level is equivalent to that single partition.
Signals are switched within a partition, not between partitions. Inputs can be switched only to
outputs contained in the same partition. Every router must contain at least one partition.
Router partitions can overlap.
In CRSC, a level is defined (1) when you create a router partition or (2) when you add a router to
your network. CRSC allows you to define up to 8 levels in a single subnet or up to 4 levels per
router, with up to 4 routers in a subnet.
Note
The same level type (Synchronous AES Mono) appears whether the router is in asyn-
chronous mode or synchronous mode.
Note
Partitions and levels do not apply to CQX routers.