EISK8-GT
Plug and Play Gigabit Switching Hub for Automation Systems
Installation Guide
The EISK8-GT gigabit switching hub is designed for the automation environment. Like
all Ethernet switches from Contemporary Controls, it features non-blocking (full wire-
speed) operation. It divides an Ethernet network into eight collision domains —
“bridging” data links to create larger network diameters than possible with repeating
hubs. Each port automatically negotiates its data rate to 10, 100 or 1000 Mbps —
controlling data flow with the PAUSE function in full-duplex links or with the
backpressure method in half-duplex links.
The switch provides preamble regeneration with symmetry and amplitude
compensation —retiming signals to eliminate jitter. Digital pre-emphasis compensates
for inherent signal strength roll-off. Link integrity is monitored, verifying that a working
adapter or hub is on the distant end of a segment.
Port assignments are learned by reading Ethernet frames and logging the source
addresses to a table. Throughput is improved by restricting traffic to those ports party
to a data exchange —while other data is simultaneously exchanged on other ports.
Store-and-forward operation is implemented and broadcast, multicast, or unicast
transmissions are received by all ports.
The EISK8-GT has eight Auto-MDIX ports for attaching local devices. In addition to a
power LED, each port has one LED showing link/activity/rate. The unit operates from a
wide range of low-voltage AC or DC power.
The EISK8-GT is provided with a writeable label for easy identification of the remote
device attached to each cable.
