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Introduction
This manual is for the Acromag Model EIS-358. The following topics are covered in this
chapter:
Overview
Product Features
Package Checklist
Overview
The EIS-358 is an unmanaged, 8-port, auto-crossing, 10/100M redundant Ethernet switch. This
model is similar to the Acromag EIS-308, but the EIS-358 adds support for simplified media
redundancy. The EIS-358 was designed to provide a simple, cost-effective solution for
redundant Ethernet switching under harsh environmental conditions. This switch has a wide
operating ambient range and includes redundant power inputs with reverse polarity protection.
This unit also includes a DC-IN jack and may be optionally powered from an AC-DC wall
transformer for Small Office/Home Office (SOHO) applications. It is packaged in a rugged, IP-30
aluminum enclosure for increased protection from extreme temperature, vibration, dust and
debris. This switch has also passed several safety certifications to help ensure safe and reliable
data transmission for industrial applications.
This unmanaged switch features a simplified, proprietary redundant ring technology that allows it
to manage a media loop with other switches of the same type, but without the use of complicated
management or reconfiguration software. A media loop is created when a message sent out on
one port is received by the same switch at another port (two message paths exist). This switch is
smart enough to temporarily disable the second path, holding it as a backup in case the primary
path fails. It also includes a normally closed alarm relay to signal port failure (if enabled). The
switch will automatically fail-over to the secondary path within 300ms if the primary path is lost.
Because it was designed to support simple, unmanaged, plug-n-play redundancy, the redundant
ring is reserved for ports 7 and 8 of this model (these ports operate identical to the others when
not connected in a loop). To utilize ring redundancy, you only need to set some DIP switches at
the front panel to designate a Ring Master and optionally enable port alarms per your application.
Product Features
8-port, 10Base-T/100Base-TX redundant Ethernet switch
Supports IEEE 802.3 10Base-T, 802.3u 100Base-TX
Provides unmanaged support for redundant media ring applications
Non-blocking, store-and-forward switching architecture
Provides redundant dual DC power inputs with reverse polarity protection
Provides an optional AC-DC wall transformer power input for SOHO applications
Includes an alarm relay to signal port break and/or power failure
Supports automatic MDI/MDI-X crossover
Supports IEEE 802.3x flow control for full-duplex operation
Includes back pressure control for half-duplex operation
Rugged aluminum case with IP30 rated protection
2K entry MAC address table
Versatile DIN-rail, surface, and wall-mountable design
