Korenix JetNet 3705 Series Industrial Power over Ethernet Switch
Contents
1. 802 3u 100Base FX JetNet3705f 512kbits embedded memory buffer with 1K entry MAC address table auto MDI MDI X RJ 45 ports Store and Forward switching architecture IEEE 802 3x flow control gt Flow control on full duplex mode gt Back pressure on half duplex mode B Reverse power polarity protection B Robust Aluminum case IP30 standard B X DIN Rail Wall mounting Desktop Installation Package Checklist Korenix JetNet 3705 Series products are shipped with the following items B One industrial PoE switch B One DIN Rail kit B X Documentation CD B Quick Installation Guide QIG If any of the above items are missing or damaged please contact your local sales representative IF EURO HC s mum Y E RS v eo JetNet3705 or JetNet 3705f DIN Rail Kit Foot CD QIG Korenix JetNet 3705 Series Industrial PoE Switch User s Manual 1 5 2 Hardware Installation This chapter includes information of installation and configuration The following topics are covered in this chapter B Introduction Dimension Panel Layout LED Indicators DIP Switch Wiring the Power Inputs Wiring the Relay Output Wiring the Ethernet Ports Wiring the Fiber Ports DIN Rail Mounting Installation Wall Mounting Installation Introduction Dimension of JetNet 3705 and 3705f series Below is the JetNet3705 series mechanical dimension diagram the unit is mm Panel Layout Here we2. 4 4 CE EN61000 4 5 CE EN61000 4 6 CE EN61000 4 8 CE EN61000 4 11 UL cUL CE EN60950 IEC60068 2 32 free fall test IEC60068 2 27 shock test IEC60068 2 6 vibration test A 2 Korenix JetNet 3705 Series Industrial PoE Switch User s Manual C Revision History Edition Date Modifications 1st Mar 30
3. at the same time then a collision may occur The arbitration protocol for carrier transmission access of the Ethernet network is called Carrier Sense Multiple Access with Collision Detect CSMA CD With CSMA CD each device will first sense whether the line is idle and available for use If it is the device will begin to transmit its first frame If another device also tries to send a frame at the same time then a collision occurs and both frames are discarded Each device then waits a random amount of time and retries its transmission until it is successfully sent Unlike other Ethernet devices such as an Ethernet host adapter or Network Interface Card NIC the port of a switch does not require its own MAC address During retransmission of a received packet the switch port will instead look like the originating device by having assumed its source address This is why the Ethernet collision domain is said to terminate at the switch port That is a two port switch will effectively break a network into two distinct data links or segments The JetNet 3705 and JetNet 3705f Industrial Ethernet Switch can break a network into 5 distinct data links or segments also called collision domains Since all Ethernet nodes are able to recognize the occurrence of a collision and since the detection of a collision is principal to the way Ethernet arbitrates media access large domains containing many nodes can become quite cumbersome Thus using an Ethernet swi
4. attached Port LED Status Description A network device is detected This port is transmitting to or receiving packets Blinks E from another transmitting device No device is attached DIP Switch The DIP switches are used to configure the power alarm and to separately enable the port alarms To enable the port alarm function Once the port links down the switch will trigger the ON relay alarm output circuit to enable the external alert system The DIP switch 1 5 is mapping to the Port 1 5 To enable Power fault alarm function To disable Power fault alarm function Notes DIP Switches 1 If the corresponding port alarm DIP switch is set ON when that port connection fails the Fault LED will light up and the alarm relay contacts will close 2 After setting any DIP Switch you will need to reboot power to activate the setting Wiring the Power Inputs IMPORTANT It is a good practice to turn off power input and unplug the power terminal block before making wire connections Otherwise your screwdriver blade can inadvertently short your terminal connections to the grounded enclosure 1 Insert the positive and negative wires of your DC supply into the V and V contacts of the terminal block connector The acceptable wire range is 12 to 24 AWG PWR PWP2 2 4 Korenix JetNet 3705 Series Industrial PoE Switch User s Manual Hardware Installation 3 OPTIONAL DC IN JetNet 3705 and JetNet 3705f Seri
5. power losses or surges at the power outlet You should also verify that your supply voltage remains within the required DC 48V while under load Refer to the port Link LED LNK to verify that a connection has been properly established solid green A blinking green LNK LED indicates communication activity If the LNK LED remains off after making a connection then no device has been detected and the cable may be bad or the connected device may be un powered Refer to the PoE LED Green to monitor for delivering power A green on PoE LED indicates that DC 48V is on feeding to the PD from JetNet3705 or JetNet3705f This LED will be solid ON during on the power feeding If the PD request power exceeds the 12 95 Watts or the cable loose short the LED will turn off and stop feeding power to the PD To avoid those wrong situations be sure the PD power consumption is below 12 95 Watts and the cable is without any failure before install the PD Korenix JetNet 3705 Series Industrial PoE Switch User s Manual 3 5 A Specifications Standards Protocols Switch Technology Transmission Rate Transfer Packet Size MAC Address Table Size Memory Buffer Backplane LEDs Network Cables PoE Port Maximum PoE Power Power Input Power Consumption Back plane IEEE 802 3 10BaseT Ethernet IEEE 802 3u 100Base TX Fast Ethernet IEEE 802 3u 100base FX Fast Ethernet fiber JetNet3705f IEEE 802 3x Flow Control and back pressure IEEE 802 3
6. than multi mode types but single mode cable is generally more expensive A fiber segment using single mode cable must use 9 125 or 10 125 TX gx micrometer single mode fiber cables For single mode the connection distance can be up to 30 km A fiber segment using multi mode must use 50 or 62 5 125 micrometer multi mode fiber cables For multi mode the connection a distance can be up to 2 km TX RX ATTENTION This is a Class 1 Laser LED product Don t stare into the Laser LED Beam Cable Wiring SC to SC TX A A RX TX B B RX DIN Rail Mounting Installation Wall mount Use the screws provided in the mounting kit and mount on the wall Din Rail Mount Use the screws provided in the mounting kit to screw up the clip on the right and left mount ears PPAR gc 2E HIER d Ten Ll JUDA PoF OP LNKACT ko ren IX PPAR NE PAREN Tek p Fault ICM STINET Te B Psi NK ACT Er NE TA i Industrial PoE Switeh Ferre Relay Pied Ai OC Gutpet avri Screw DIN rail clip Use a cross screw driver to screw up the DIN rail clip the DIN rail clip should be screwed in the rear of the ear and then clipped on the DIN rail 2 2 Korenix JetNet 3705 Series Industrial PoE Switch User s Manual Troubleshooting This chapter includes the information for general troubleshooting The following topics are covered in this chapter B Power Connections B Incorrect Connections gt Faulty or Loose Cables gt Non standard Cables
7. 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 u
8. Korenix JetNet 3705 Series Industrial Power over Ethernet Switch User s Manual First Edition April 2006 korenix WWW korenix com Korenix JetNet 3705 Series Industrial Power over Ethernet Switch User s Manual Copyright Notice Copyright 2005 Korenix Technology Co Ltd All rights reserved Reproduction in any form or by any means without permission is prohibited FCC Warning This Equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures B Reorient or relocate the receiving antenna B Increase the separation between the equipment and receiver B Connect the equipment into an outlet on a circuit different from that to which the receiver 1s connected B Consult the dealer or an experienced radio TV technician for
9. WITCH IS ON BUZZER SPST CONTACTS ARE RATED TO 24VDC 1A 1 Connect to the SPST alarm relay terminals as per your application Insert your load wires and tighten the alarm terminal screws to prevent the wires from coming loose These contacts are open for normal operation and close in alarm Do not exceed 24V and 1A current 2 Verify that your load is wired to the central two terminals of this terminal block After the relay is wired insert this terminal block into its socket Korenix JetNet 3705 Series Industrial PoE Switch User s Manual 2 5 Wiring the Ethernet Ports JetNet 3705 and JetNet3705f Series Industrial PoE Switch support 4 RJ 45 ports JetNet 3705 with automatic MDI MDI X crossover PoE Injector and automatic 10 100Mbps data rate sensing for 10Base T or 100Base T X connections Automatic MDI MDI X crossover allows you to connect to other switches hubs or workstations without regard to using straight through or crossover cabling The switch also provides one RJ 45 uplink JetNet3705 or 100Mbps Fiber uplink port JetNet 3705f Port 1 to port 4 also provides Power over Ethernet function that delivers DC 48V power through the spare pairs to power the PD The DC 48V is delivered through the RJ 45 pin 4 and 5 DC 48V through the RJ 45 pin 7 and 8 The following figures depict the schematic diagram of straight through and crossover cabling Note that crossover cables simply cross connect the transmit lines at each en
10. af Power over Ethernet CSMA CD Non blocking store and forward switching architecture 14 880 pps for Ethernet port 148 800 pps for Fast Ethernet port 64 bytes to 1522 bytes with VLAN tag 1K MAC address table 512K bits 1 0Gbps B Per port Link Activity Green on Green Blinking 100Mbps Yellow on Yellow Blinking 10Mbps PoE Green B Per unit Power 1 Green Power 2 Green Power Green Fault Red 10Base T twisted pair UTP STP Cat 3 4 5 cable EIA TIA 568 100 ohm 100m 100Base TX twisted pair UTP STP Cat 5 cable EIA TIA 568 100 ohm 100m Port 1 4 Pin assignment TX 3 6 RX 1 2 Positive Vport 4 5 Negative Vport 7 8 Per port 15 4Wats DC 48V or 48V redundant dual DC power inputs with reverse polarity protection and a removable terminal block for master and slave VDC power inputs Extra DC jack for AC DC power adapter 6 5Watts without PD loading 60Watts with PD full loading 1 6Gbps Relay alarm current voltage Operating Temperature Operating Humidity Storage Temperature Dimensions Case protection EMI EMC Safety Stability Up to 1A and 24V DC General model 10 C 70 C 14 F 158 F Wide operating Temp model 40 C 70 C 14 F 158 F 5 to 95 Relative Humidity non condensing 40 C to 85 C 33 8 mm H x 164 8 mm W x 108 mm D IP 30 degree Aluminum case Fan free design FCC Class A EN55022 Class A CE EN61000 4 2 CE EN61000 4 3 CE EN61000
11. amp Negative Vport Tx amp Positive Vport NEN Tx amp Positive Vport Rx amp Negative port NENNEN Rx amp Negativen Tx amp Positive Vport Vport Pin assignment of PSE Be sure the twisted pair cable is bound with the standard RJ 45 pin especially the pin 4 5 7 and 8 If the RJ 45 is bound with the wrong pin number Jetnet3705 will not recognize the PD and won t forward DC 48V power to PD since the JetNet 3705 series switch following the Alternative B mode In the IEEE 802 3af standard documents it indicates the PD should support mode A and B and only receiver power from either mode A or mode B The following table shows the RJ 45 pin out for the PD Fee Vaor Negative voon Positive Voor Nevatve a OOOO Nese VponPostve on SSS Negative VponPosive oot Fete Voor Pete Voor Fite vp Pete Vo Positive Vport Negative Vport Ss s EE GN L Wiring the Fiber Ports JetNet 3705f series The automatic MDI MDI X crossover function does not apply to fiber connections as these must be crossed over manually To connect the fiber port on one switch to the fiber port of another switch simply cross connect the transmit channel at each end to the receive channel at the opposite end as illustrated in the figure below JetNet 3705f Series have one 100Base FX port with SC type connector in multi mode and single mode versions Single mode types have greater distance capability
12. d to the receive lines at the opposite end Switch Router or PC Switch Switch 3 TD 3 RD 3 TD 3 TD 6 TD 6 RD 6 TD 6 TD RD RD 1 RD4 4 1 TD 2 RD 2 RD 2 RD 4 2 TD Straight through Cabling Schematic Cross over Cabling Schematic Note that Ethernet cables use pins 1 2 3 and 6 of an 8 pin RJ45 connector The signals of these pins are converted by the automatic MDI X function as shown in the table below Connect one side of an Ethernet cable into any switch port and connect the other side to your attached device The green LNK LED will light up when the cable is correctly connected Refer to the LED Indicators section for descriptions of each LED indicator Always make sure that the cables between the switches and attached devices e g switch hub or workstation are less than 100 meters 328 feet 2 6 Korenix JetNet 3705 Series Industrial PoE Switch User s Manual Connecting to PD Port 1 to port 4 provide PoE inject function with maximum 15 4w ability to power up the powered device use the straight or cross over Ethernet cable The JetNet3705 and JetNet3705f follows the IEEE802 3af Alternative B mode connector assignment The following table shows pin assignment of alternative A and B for the PSE Power Source Equipment Alternative A Alternative A Alternative B Conductor MDI X MDI All Rx amp Negative Vport Tx amp Positive Vport cl Rx
13. ed for use in critical control applications as most control systems have a defined time requirement for packet transmission typically less than 100ms 1 2 Korenix JetNet 3705 Series Industrial PoE Switch User s Manual Introduction Switches on the other hand are intelligent devices used to more efficiently connect distributed Ethernet nodes than a hub Unlike a simple hub a switch provides targeted data transfer as it will forward a data packet to a specific port or network segment rather than to all ports thus freeing up bandwidth The ability to target a packet to a specific port increases network throughput and helps to eliminate the collisions that have historically made Ethernet non deterministic So we see that by targeting the data transfer between ports switches act as intelligent repeaters to increase network distances In doing this they actually split networks into separate collision domains at each port Thus switches increase determinism by reducing collisions Switches also increase network bandwidth and throughput as well as provide supplemental error checking on data packets to help ensure the integrity of forwarded data Each port of this switch functions just like any other Ethernet device It is able to receive and decode Ethernet frames test for frame integrity plus assemble and transmit Ethernet frames With Ethernet any device can try to send a data frame out at any time If two devices happen to send a data frame
14. eeeeseeeeseeeeeeueeeeaeesseeeesaeeeseas 2 2 Chapter 3 TFOUDIGSDOO ng 65e obiecit ioci eruit ioi 3 3 Power ere a eMe Rm m 3 4 IMIGCOFFECE ro eia ello c E DOE E 3 4 Faulty or Loose mC aD em m 3 4 Non standard Cables iioii ciini ee tee vtr EE 3 4 Improper Network POST s osos nietos ootut aep bene utu da IUGUM cabod ae E ata 3 4 LED IAQCALOIS enuia D T 3 5 Appendix A Specifications sssnsnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn mnnn A 1 Appendix B Revision HIStory sssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn B 1 1 Introduction Korenix JetNet 3705 Series is a power over Ethernet rail switch that is specially designed for industrial or commercial applications The following topics are covered in this chapter Overview Ethernet Switching Technology Power over Ethernet Technology Product Features Package Checklist Installation Guide Overview JetNet 3705 Industrial Power Over Ethernet PoE Switches have four ports 10 100 TX ports with PoE injector plus one 10 100TX up link port JetNet 3705 or four ports 10 100 TX ports with PoE injector plus one 100FX up link port multi mode m or single mode s models JetNet 3705f It is designed to operate under harsh environmental conditions The switches provide Power over Ethernet functions to deliver 15 4Watts power budget to powered device PD which is in compliance with IEEE802 3af standard to deliver bot
15. es Industrial Ethernet Switch has an additional power jack for the connection of AC DC power converters wall transformer type designed for office use Be sure that the output voltage is at 48V DC to power the unit Refer to switch PWR LED to verify the power via the DC IN jack Note If all three power inputs are connected DC IN PWR 1 PWR 2 the JetNet will be powered from the highest connected voltage The unit will not alarm for loss of DC IN power the alarm function only applies to loss of power at PWR1 or PWR2 Wiring the Relay Output The alarm output relay contacts are located at the two middle terminals of the power terminal block between PWR2 and PWR1 as shown in the figure below These contacts are single pole single throw SPST and are energized open circuited for normal operation These contacts will close if the unit is not powered or if either DC power 1 or power 2 fails or if a port connection fails if that port alarm DIP switch is ON The figure below gives an example of how the output alarm relay operates Note The relay contacts are energized open for normal operation and will close for fault conditions This contact does not supply any power and is rated up to 24V DC at 1A current FAULT ALARM THE ALARM DEVICE WILL SEND CONTACTS A WARNING SIGNAL TO WARN OF POWER OR PORT FAILURE THE CONTACTS WILL CLOSE IF POWER IS OFF OR IF PWR1 OR PWR2 FAILS OR UPON A PORT LINK FAILURE IF PORT 24V DC ALARM DIP S
16. etwork Excessive collisions may be indicative of a cable that is too long It may also signal the presence of too many repeaters hubs between devices and can also be indicative of a congested network too many nodes in one segment A high number of undersized and fragmented packets can result from interference induced into the network cable by either passing it too close to noisy devices or because of problems with the network devices themselves In these instances check for improper cabling damaged cables or cables routed too closely to noisy equipment or other wiring A high number of oversized packets can result from a bad transceiver excessive cable noise or from a speed mismatch between the switch ports and the connected devices 3 4 Korenix JetNet 3705 Series Industrial PoE Switch User s Manual LED Indicators JetNets can also be visually monitored via its own front panel LED indicators This can be useful to assist in identifying common problems and to help you find possible solutions Check the redundant PWR1 and PWR2 LED s to verify DC power The PWR LED will light for any connected power PWR1 PWR2 or DC IN Check PWR for power via an AC adapter connected to DC IN If the power LED indicator does not light when the power cord is plugged in you might have a problem with the power outlet or the power cord If the switch simply powers OFF on its own after running for a period of time check for loose power connections
17. gt Improper Network Design WB LED Indicators Korenix JetNet 3705 Series Industrial PoE Switch User s Manual 3 3 Power Connections JetNet 3705 and JetNet 3605f is powered by 48V DC You should verify that the output of your DC supply voltage or AC DC power adapter is at 48V DC while under load IMPORTANT The power input range for the JetNet3705 series is from 44v to 57v but to avoid damage and keep the switch with good performance we strongly suggest you choice DC 48V as the power input If you are using an AC DC power adapter and the DC IN power indicator PWR of the JetNet does not light when the power cord is plugged in you may have a faulty power cord Check for loose or broken power connections Also check for power loss or power surges at the AC power outlet Verify that your AC DC adapter is properly sized and outputs the correct voltage under load Incorrect Connections Select Ethernet cables with specifications suitable for your application In general Ethernet cables are categorized into unshielded twisted pair UTP and shielded twisted pair STP types Shielded cables are recommended In general Category 3 4 and 5 Ethernet cables are suitable for systems with 10Mbps transmission speed But for systems at 100Mbps you should only use Category 5 or better Ethernet cables In addition always make sure that the cable length between device ports does not exceed 100 meters 328 feet The RJ45 ports of this switc
18. h automatically detect straight through or crossover cables and then cross connect the transmit and receive channels when you connect the switch to another device This feature does not apply to the fiber port connections You must manually cross connect transmit and receive cables between the fiber ports of connected devices For fiber connections make sure that the fiber cable type matches the fiber model multi mode or single mode For the RJ 45 connectors use the correct UTP or STP cables as required For 10 100M ports use 2 pairs of twisted cables Faulty or Loosen Cables Visually inspect for loose or obviously faulty connections at all connectors and cables If that does not correct the problem try replacing the cable Non standard Cables Non standard and incorrectly wired cables may generate increased network collisions and other network problems which will impair network performance A category 5 cable tester is a recommended tool for every 100Base TX network installation Improper Network Design Verify that your network has been properly designed Most errors simply result from poor quality cable poor cable routing network congestion improper cable length and too many repeater hubs between end nodes Errors may also result from inadvertent data path loops redundant message paths Message loops can generate broadcast storms that can bog down a network There should be only one active message path between any two nodes on a n
19. h of Ethernet data and DC 48V power through the traditional UTP or STP cable to the PD The IP30 design aluminum case further strengthens JetNet 3705 s withstand ability in harsh industrial environments The event warning is notified to field engineers by relay output triggering field alert system JetNet 3705 Series Industrial PoE Switch has passed CE FCC UL safety certifications to help ensure safe and reliable data transmission for industrial applications JetNet 3705 Series will be your best option for industrial network or security system 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 accept
20. help CE Mark Warning This is a class A product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures Table of Contents POCO EDT E TU UU 1 GE Mk WaEDIFIO cise tnt Sat sede a eU Pd enun nin G addu 1 Chapter 1 MOUCHO ET EE TE TEE TTD ETT 1 1 Sg mr 1 2 Ethernet Switching Technology ccccccssesceeeseeeeeeceeeceeceeeeeeesseeeeeesaeeeeesaaaes 1 2 Power over Ethernet Technology cccccsscccseccceseeceeeeceeeeecsesessueeseeeesneesenees 1 4 Produc FeatUrG c TT ro 1 5 Packade CheckliSE ele etoile n a Einem uM uio udes ed t SbsdE 1 5 Chapter 2 Hardware InstallallOIL ii coii eoo coria curru roce e UE sre Cer Fa cese ve vera ve cra dieescus 2 1 HATO GTC Is NN ETE SO T T o 2 2 Dimension of JetNet 3705 and 3705f senes eeseeeeeessseeeeee 2 2 luis DEO NT 2 2 LED Indica ena veste issues beta veuneacoude seein betes 2 3 DIP SWC Lies situontesed e iscitenduMd Sa T MEE LE IM Scu 2 4 Wirmo the POW CR INPUTS ieaie e eu excu ela uubES Sui D a EU Und E 2 4 Wiring the Relay OUIDLIL oiov eir ek aces a te tera oa ec usan eee 2 5 Winnog Ne Ethernet TP OBS RH EHE cUm eietiaantianeratinhouieMncarmaiumiasieiets 2 6 GONMECING 10 PD weccasceanes cc 2 1 Wiring the Fiber Ports JetNet 3705f series seseseeesseeseeeeesses 2 2 DIN Rail Mounting Installation ccccccccsssceceseeee
21. p to 15 4 watts in maximum and one 10 100Base TX Up link port transferring data to remote end The JetNet 3 05 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 1 4 Korenix JetNet 3705 Series Industrial PoE Switch User s Manual Introduction Product Features Korenix JetNet 3705 and JetNet3705f Series products have the following features 4 port 10 100TX with PoE injector plus one 100Mbps fiber up link port JetNet3705 4 port 10 10TX with PoE injector plus one 10 100TX up link port JetNet3705f Support single mode fiber or multi mode fiber JetNet3705f Deliver 15 4W power budget per PoE port Redundant DC Power Inputs Alarm Relay to signal port break and or power failure Support IEEE 802 3 10Base T 802 3u 100Base TX
22. re forwarding it to its destination Although this method may seem to increase the forwarding time latency and possibly cause fragmentation it effectively reduces the occurrence of error frames and improves overall throughput This is particularly useful when there is heavy network traffic and or greater potential for noise and interference Korenix JetNet 3705 Series Industrial PoE Switch User s Manual 1 3 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
23. tch to subdivide a large network into separate collision domains will certainly help to increase throughput The current tendency in critical industrial control applications is to connect one Ethernet device per switch port This will produce the most deterministic mode of operation as the switch can then operate full duplex with no chance of collisions This ensures determinism helping critical control applications to remain predictable and on time Each port of a switch forwards data to another port based on the MAC address contained in the received data packet frame In order to know which port to forward a data packet to the switch will learn and store the MAC addresses of every device it is connected to along with the associated port number However until the switch actually learns the port a particular address resides at the first packet it forwards this traffic to all ports just like a hub The switch will use its internal look up table to quickly determine the location port of a node establish a temporary connection between itself and the node then terminate the connection once a packet is transferred In this way it increases network bandwidth and provides the network determinism required for critical control applications JetNet 3705 and JetNet 3705f Series Industrial Power over Ethernet Switch uses a store and forward algorithm to process Ethernet frames That is it first stores the Ethernet frame and examines it for errors befo
24. use JetNet 3705 PoE Switch as an example Top View LED indicators DIP switch RJ 45 PoE ports Terminal Block Fiber ports JetNet3705f RJ 45 port JetNet3705 6 DC Jack ON c1 A W N 2 2 Korenix JetNet 3705 Series Industrial POE Switch User s Manual Hardware Installation Right Side View JetNet3705f and JetNet3705 A DIP Switch to configure the port and power alarm and a DC IN power jack neeaae for connecting an optional AC to DC power adapter DC 48V DC Jack DIP Switch Bottom Side View JetNet3705f and JetNet3705 i One ground screw to screw up the ground wire to protect the system and one terminal block for the DC 48V power input and alarm relay contact JetNet3705f Ground Screw Output Terminal Block LED Indicators There are 13 diagnostic LEDs on JetNet 3705 and JetNet3705f Industrial PoE Switch These LED indicators provide administrators with real time system status The following table describes the function of each LED indicator ue DC IN Power Jack is On No Power in DC IN PWR 1 Terminal Block PWR1 Power is on Off No power in Terminal Block PWR1 PWR 2 Terminal Block PWR2 Power Is on Off No power in Terminal Block PWR2 Port link down or power link down For the Power status it only supports for the Power 1 and Power 2 Korenix JetNet 3705 Series Industrial PoE Switch User s Manual 2 3 mes LEER The port is delivering PoE power No PD is
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