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Appendices
S-1608/S-0816 Digital Snake Owner’s Manual 71
To be used in a REAC system, an Ethernet switching hub must meet the following requirements:
• 1000BASE-T transmission speed (IEEE802.3ab, Gigabit Ethernet)
• Support for 100BASE-TX devices (IEEE802.3u, Fast Ethernet)
• Bi-directional (full-duplex) communication
Connect REAC devices only to switching hub ports that support 100BASE-TX.
Appendix C: Ethernet Switching Hub Requirements
The transmission protocol for REAC is based on 100BASE-TX (Fast Ethernet). To transfer up to 40
channels of digital audio, REAC uses the full bandwidth of this protocol. However, some 100BASETX
switching hubs cannot handle this amount of data traffic. Gigabit Ethernet switching hubs can handle
a larger amount of data traffic, so we recommend them for use with REAC devices (just be sure that
the Gigabit switching hub you use supports 100BASE-TX devices).
When using switching hubs in-line for REAC cable length extension, a maximum of four hubs can be
used. (Total cable length with four switching hubs: 500 meters. See Chapter 6 for more information.)
Consult the switching hub’s documentation for information on its proper use.
When a switching hub is used in-line with REAC cables, the network latency will increase by the
amount of processing delay introduced by the hub itself. The actual delay is dependant upon the
specifications of the hub, though the maximum delay amount for a single hub should be about 200
microseconds.
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