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REAC Applications and EXPANSION SLOT Settings
This section describes methods of conguring evolutionary
networks using REAC. It begins with a review of what you learned
in Quick Start.
Basic REAC Knowledge
REAC (Roland Ethernet Audio Communication) is Roland’s own
original digital audio-transmission technology using Ethernet. It
uses a protocol independently developed by Roland based on
Ethernet technology, and makes possible transmission of 40 input
and 40 output channels of 24-bit digital audio at 96 kHz using a
single Category 5e Ethernet cable. REAC devices can also easily be
interconnected.
5 Capable of 40 inputs and 40 outputs of 24-bit digital audio at
96 kHz
5 Allows easy device connection using just master, slave, and split
settings
5 Capable of transmission of up to 100 meters over a single Cat
5e cable
5 Extension of cable length possible using an Ethernet switching
hub
5 Easy signal splitting possible using a switching hub
5 Extremely short transmission latency between REAC devices
(approx. 375 microseconds)
About Cables
Because Category 5e Ethernet cables are used, connecting REAC
devices to one another is simple and easy. These Cat 5e Ethernet
cables are ordinarily used to make computer network connections.
Ethernet Cable Types
5 Crossover cable
The cable’s internal wiring crosses over at each RJ45 plug. This
means that the connections of the RJ45 plugs at either end of
the signal cable are dierent.
5 Straight cable
The cable’s internal wiring is arranged identically at each end.
With this unit, you can use either crossover cables or straight cables.
For making connections to the REAC ports, we recommend using
optionally available REAC cables (SC-W20F, SC-W100S, W100S-R,
etc.).
Ethernet Connectors
Ethernet cables use RJ45 plugs. REAC devices are provided with an
RJ45 connector at REAC port.
RJ45 plug REAC RJ45 connector
For critically important communication, protecting RJ45 plugs and
connectors is vital. In such cases, rugged Neutrik EtherCon plugs are
used for the REAC RJ45 plugs.
Using EtherCon RJ45 plugs makes possible the same kind of latch-
locked connections as when using XLR plugs.
Neutrik provides EtherCon RJ45 plugs, as well as EtherCon plugs
that you can add to or use to modify RJ45 plugs on third-party
Ethernet cables.
REAC Modes
The REAC mode determines how the REAC devices transmit audio
signals over the network.
REAC modes are of the following three types.
MASTER
REAC devices set to MASTER operate as follows.
5 Audio signals are sent to SLAVE and SPLIT.
5 Audio signals are received from SLAVE.
SLAVE
REAC devices set to SLAVE operate as follows.
5 Audio signals are sent to MASTER.
5 Audio signals are received from MASTER.
SPLIT
REAC devices set to SPLIT operate as follows.
5 Audio signals are received from MASTER.
5 REAC devices set to SPLIT cannot send audio signals.
MASTER
SLAVE
SPLIT
SPLIT
You combine REAC devices set to the three modes just described
to congure the REAC transmission path. Please note the following
rules.
5 One MASTER is required in the path.
5 Two or more MASTER units cannot coexist in the path.
5 Two or more SLAVE units cannot coexist in the path.
5 Multiple SPLIT units can coexist in the path.
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