Korenix JetNet 3705, User Manual

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Korenix JetNet 3705 Series Industrial PoE Switch User’s Manual 1-4
The industry-wide shift from Ethernet hubs to Ethernet switches has dramatically boosted the
bandwidth of networks and helped to eliminate congestion problems inherent with the CSMA/CD
protocol (Carrier Sense Multiple Access with Collision Detection). Since a switch operates by
learning the location of addresses and forwarding messages directly, unnecessary traffic is
greatly reduced. It will use auto-negotiation to regulate the speed and duplex of each port based
on the capabilities of connected devices. These features combine with flow control allow a 100M
node to effectively communicate with a 10M node without losing data. Connecting one device
per switch port also allows two-way, simultaneous transmission to occur (full duplex), essentially
doubling the bandwidth. Further, by segmenting a collision domain in this way, the need for
non-deterministic carrier sensing (CSMA/CD) is eliminated. The utilization of a store-and-forward
switching algorithm allows each packet to be inspected, and corrupt or redundant data to be
filtered, further eliminating unnecessary traffic that often slows a network down.
Power over Ethernet Technology
Power over Ethernet is a revolutionary technology that allows IP telephones, wireless LAN
Access Points, Security network Cameras and other IP-based terminals to receive power and
data in parallel. The Power over Ethernet can bring a lot of benefits, such as cost saving,
simplicity, reliability, safety, control and security.
The IEEE802.3af (Power over Ethernet) is established on June 2003, which defined how to
deliver DC 48V power and Ethernet frame through the traditional cabling system.
PoE architecture includes 2 elements, Power Sourcing Equipment (PSE) and Powered Device
(PD), PSE device
provides auto detection capability to recognize the characteristics of link
partner to deliver exactly power to the PD, it also will not damage the link partner if it is not a PD
or the link cable is short, or the device is broken, and execute a series of standard procedure
when the PD is disconnected to avoid send out a huge power to damage the device or user
.
The IEEE802.3af standards have specified the architecture and the type of PSE, PSE supports 2
different types, End-point and Mid-Spain for the different power feeding model and wiring.
In the IEEE803.3af also specified the PD should compatible with End-point and Mid-Spain PSE,
and exactly, honestly claims the level of power consumption.
JetNet 3705 equips 4 PoE injector switch ports, with each port delivering power up to 15.4 watts
in maximum, and one 10/100Base TX Up-link port transferring data to remote end. The JetNet
3705 conforms to IEEE 802.3af Power over Ethernet (PoE) standard. Using an external 48VDC
power supply, JetNet 3705 enables power and data transmission to be pumped out over the
same UTP or STP cable in the four PoE ports.
JetNet3705 is in compliance with IEEE 802.3af standard and supports Power Sourcing
Equipment (PSE) function. It delivers power through the spare pairs (4, 5, 7, 8) of standard
Ethernet CAT
- 5 cable and transmits data through the traditional pairs (1, 2, 3, 6). The
JetNet3705 PoE ports provide PoE auto detection of the link partner to deliver the exact power
to the PD. If the link partner is not a PD or the link cable is short, or the device is broken, it will
executes a series of standard procedures to avoid sending out a huge power to damage the
linked device.