Korenix JetNet 4500 Series, User Manual

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Korenix JetNet 4500 Series Industrial Managed Ethernet Rail Switch User’s Manual 1-2
Overview
JetNet 4500 series, Industrial 8-port Managed Ethernet Switches, that have eight
10/100MbaseTX ports (JetNet 4508) or six 10/100MbaseTX ports, plus two 100BaseFX ports
(multi-mode “-m” or single-mode “-s” models, JetNet 4508f), and are designed to operate under
harsh environmental conditions. The switches provide solid foundation for a highly fault-tolerant
and easily-managed network. JetNet can be remotely configured by web browser, and managed
by Simple Network Management Protocol (SNMP) and Remote Monitoring (RMON). Security is
enhanced with advanced features such as Port/Tag-based VLAN and IP security. Performance
is optimized by QoS and IGMP Snooping/querying. Korenix Super Ring technology enables
superb self-healing capability for network failure. The IP30-design aluminum case further
strengthens JetNet 4500’s withstand ability in harsh industrial environments. The event warning
is notified to the network administrator via e-mails or to field engineers by relay output. JetNet
4500 Series Industrial Managed Ethernet Switch has also passed CE/ FCC/ UL safety
certifications to help ensure safe and reliable data transmission for industrial applications. JetNet
4500 Series will be your best option for highly-managed and industrial network.
JetNet 4500 series comes with an advanced redundant network solution, Ring Coupling and
Dual Homing technology, to assure non-stop system operation. Korenix Super Ring technology
provides network redundancy that can self-recover in less than 300ms at full load. With Ring
Coupling technology, Ethernet Ring can be extended the attached switches in double. The Dual
homing technology provides an enhanced redundant ability to connect JetNet 4500 Super Ring
topology with other managed switches using Rapid Spanning Tree Protocol.
Ethernet Switching Technology
To better understand the operation of an Ethernet switch, we need to first differentiate it from a
hub. An Ethernet hub (or repeater) is a device that is used to simply connect Ethernet nodes.
Any message at one hub port is repeated on all ports. That is, hubs forward data packets they
receive from a single station to all hub ports. As a result, all port devices connected to a single
hub will share the same bandwidth. Then as nodes are added to the network hub, they compete
for this finite amount of bandwidth and this can cause data collisions to occur, making network
determinism impossible to attain, especially on busy networks. Now determinism is a term that is
used to describe the ability to guarantee that a packet is sent or received in a finite and
predictable amount of time. The inherent lack of determinism is the main reason that traditional
Ethernet had problems being accepted for use in critical control applications, as most control
systems have a defined time requirement for packet transmission, typically less than 100ms.