5—S-1608/S-0816 System Overview
26 S-1608/S-0816 Digital Snake Owner’s Manual
About REAC

About

At the heart of the S-1608/S-0816 System is the REAC (Roland Ethernet Audio Communication)
interface. This proprietary protocol is based on the Ethernet technology that’s used in computer
networks, and allows for the transfer of up to 40 channels of digital audio over a single Cat5e Ethernet
cable.
REAC features and benefits:
• 40 channels of digital audio transfer at a 24-bit/96 kHz sampling rate
• Cable length up to 100 meters (330 feet)
• Cable length extension using REAC Splitter S-4000-SP or Ethernet switching hubs
• Easy device splits using REAC Splitter S-4000-SP or Ethernet switching hubs
• Extremely low device-to-device transmission latency (The REAC network latency is about 375
microseconds. The signal latency for analog input to another analog output is about 1.2
milliseconds.)
• Hot-swappable connection

Understanding Cables and Connections

Hooking REAC devices together is extremely easy, as connections are made using Cat5e (short for
“Enhanced Category 5”) Ethernet cable. This cable is a standard in the computer connection world—
in fact, you may be using an Ethernet cable in your home or office right now to connect your
computer to a high-speed modem, a printer, or a network. This lightweight cable uses RJ45 plugs,
which are very similar to standard telephone connectors.

Cat5e Ethernet Cable Types

There are two different types of Cat5e Ethernet cables that you can use with the S-1608/S-0816
System. Though the cables look the same on the outside, the RJ45 plugs are wired in different ways.
With a:
•
crossover cable
—some of the wires inside the cable are “crossed over” at each RJ45 plug. As a
result, the two RJ45 plugs on each end of a single cable are wired differently.
•
straight-through cable
—the wires inside the cable are connected to each RJ45 plug in the same
arrangement (each plug is wired the same).
Things to Know
The S-1608/S-0816 system transfers a total of 24 channels of audio signal: 16 channels from the S-
1608 and 8 channels from the S-0816.
If routed through the S-4000-SP REAC splitter or a switching hub, an approximate 200 microsecond
delay is added for each device.
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