The EISM miniature switching hub is designed to be used where space is at a premium because of shrinking panels and the space restrictions of small machines.
The EISM5-100T is designated as a five-port miniature switching
hub. One port has an extra socket allowing it to be used as an uplink port to connect two switches together; thereby, eliminating the need for a crossover cable. This unit is similar in function and capabilities to its EIS8-100T counterpart. It divides the Ethernet network into as many as five separate collision domains. It terminates the collision domain at each port. It functions as a bridge between these various data links, creating a larger network diameter than can be achieved with repeating hubs. Each port automatically negotiates with its attached device the data rate (10 or 100 Mbps) and duplex (full- or half-duplex) for that port. The flow control mechanism is also negotiated. For full-duplex segments, the PAUSE
scheme is used. For half-duplex segments, the backpressure method is automatically invoked.
The switch learns the port locations of Ethernet devices by reading complete Ethernet frames and observing source addresses. A table of source addresses and corresponding port assignments is created and maintained. From that time on, traffic is restricted to only those ports involved in a transmission. This allows enhanced throughput since simultaneous transmissions can now be initiated on those ports without activity. Also, table values are aged to automatically accommodate changes to the field wiring. If a unicast transmission to an unknown destination is received on a port, all other ports are flooded with the transmission. This is also true of broadcast or multicast transmissions.
Link integrity is monitored, verifying that a working adapter or hub is on the distant end of a segment. To aid troubleshooting, each port LED glows solid if a link exists, flashes to show activity and shows data rate by color: green for 100 Mbps and yellow for 10 Mbps. One green power LED is provided.
Other features include a wide-range, low-voltage AC or DC power source. Provisions exist for redundant power connections. The unit mounts on TS-32 or TS-35 DIN-rail, making it simple to install into industrial control panels.
Plug and Play operation (PnP)
Shielded RJ-45 connectors
Auto-negotiated data rate, duplex and flow control
Full- or half-duplex
Broadcast storm control
Built-in uplink provision
Wide-range, low-voltage AC or DC powered
Provision for redundant power connections
LEDs for activity/link/data rate and power
Easy DIN-rail installation
Industrial environment EMC compatible
UL 508 and UL 1604 Class 1, Division 2 Listed
AI-XFMR-E Wall-mount plug-in transformer 230V AC (nom) input / 24V AC (nom) output