The
EIM4-10T 10 Mbps miniature repeating hub provides a simple, cost-effective
method for increasing a 10BASE-T system beyond two nodes or to increase network distances beyond
the 100-meter limit of the 10BASE-T specification.
The EIM4-10T is
classified as a miniature, 4-port Ethernet repeating hub. Adhering
to the IEEE
802.3 standard, the hub provides
preamble regeneration with symmetry and amplitude compensation.
A repeater must retime signals so that jitter, introduced by transceivers
and cabling, does not build up over multiple segments. It must be
able to detect either runt packets or collisions and reinforce detection
by generating a Jam signal. As a final point, it needs to automatically
partition jabbering ports so the entire network is not rendered useless.
This unit supplies
its transmitting ports with the necessary digital pre-emphasis to
compensate for the inherent roll-off of signal strength on the twisted-pair
cable. Each twisted-pair segment can be up to 100 m in length. Shielded
RJ-45 connectors are used to accommodate either UTP or STP cabling.
The Link Integrity function is supported — confirming that
a functioning adapter or hub is on the other end of the segment.
Hubs can be cascaded with either straight-through or crossover cables.
Port 4 has an extra socket to allow switch cascading without a crossover
cable.
Each port LED
glows when a valid link is made to other equipment — and flashes
to indicate segment activity. One common green LED indicates power
applied and a common red LED reports collisions on the shared Ethernet
network.
The EIM4-10T mounts
on TS-32 or TS-35 DIN-rail, can operate from a wide range of low-voltage
AC or DC power and offers redundant power connections.
