Spiderlan User Manual
Contents
1. SPIMS4 submodule connector 2002 by MPL AG 11 MEH 10095 001 Rev B USER MANUAL High Tech Made i in switzerland SPIDERLAN 3 1 1 3 ONBOARD SWITCH VERSION SPIDERLAN 1P SPIDERLAN 2P LED1 2 LED2 2 1 03 2 LED4 2 PC 104 Plus 1 1 LED2 1 LED3 1 LED4 1 pene connector 1 Port 1 Port 2 Port 3 Port 4 Channel 2 4x 10 100BaseTX RJ45 factory used Pc 104 PC 104 Plus connector connector d 1 4 PC 104 Plus Slot Selector Switch BH 4x 10 100BaseTX RJ452. 2002 by MPL 7 10095 001 Rev B USER MANUAL SPIDERLAN High Tech Made in Switzerland 2 3 1 2 SWITCH SUBMODULE SPIMS4 Le 24 38 pl 2002 by MPL MEH 10095 001 Rev B M PL SPIDERLAN ET Made in Switzerland US E R MAN UAL 2 3 2 ONBOARD SWITCH VERSION SPIDERLAN 1P SPIDERLAN 2P 2002 by MPL AG 9 MEH
3. G31 XZ G31 XZ G31 XZ sora Svr Sv Sora ENK G31 XZ G31 XZ sora ser sora Svr MEH 10095 001 Rev B 18 2002 by MPL AG SPIDERLAN USER MANUAL High Tech Made in Switzerland 1E SPIDERLAN 2E z st D a no z o D gt o lt 2 D X N E ee vOL Od Jojoeuuo ee OLM ee Snid POL Od 10 5 1015 Snid 70 2 Jojoejes 1015 Snid POL Z606ZV LSW4 wJeNOd Z J9 03002 Jegen ynos snid POL Z jauueyo 6 6 6 IIl LSY4 w NOd L 49j 0J3u02 1euJeu143 jauueyo Jepeeu op Japeay 0p e qeo uoqqu ejqeo uoqqu Japeay op YSNIdS Japeay op vSWIdS 396689 Z YOUMS 396689 Vous eUI GAT XZ G31 XZ GAT XZ G31 XZ Svr Svr Svr Svr a31 XZ G31 XZ Svr Svr Svr Svr MEH 10095 001 Rev B 19 2002 by MPL AG USER MANUAL High Tech Made in Switzerland SPIDERLAN 4 2 LED INDICATORS 4 2 1 INTEGRATED RJ45 CONNECTOR INDICATORS 4 2 1 1 LINK ACTIVITY GREEN On Link Pass Off Link Failed Transm
4. sas IRQB fee ee E Signal not used or not available For more detailed information refer to the PC 104 Specification Version 2 3 and to the IEEE P996 draft standard D2 02 2002 by MPL AG 16 MEH 10095 001 Rev B M PL SPIDERLAN High Tech Made in Switzerland US E R MAN UAL 3 3 4 PC 104 PLUS INTERFACE PIN NUMBERS Number RowA RowB X RowC 6 fabi J ADI0 CBE LA Ton 9 SERR GND 507 Notes 1 Signal not available designed for the use of max 2 modules 2 For more detailed information refer to the PC 104 Plus Specification Version 1 0 and to the PCI Specification Rev 2 1 2002 by MPL AG 17 MEH 10095 001 Rev B SPIDERLAN USER MANUAL Made in Switzerland High Tech 4 OPERATION 4 1 BLOCK DIAGRAM SPIDERLAN 2P X 2 lt l ra n 2 2 o 2 gt O E o Q G lt 2 T 40 99UU0D 40 99UU0D yBnosy xoeis ee POL and POL Od 10 1015 Snid POL sng 10199 101 snid POL Od 2606ZNV II LSV3 ANY 1 weie POL Snid 0 04 2606ZNV Ill LSY4 wjeNOd 49 04 U0D 1euJ8u13 Z jeuueuo 396689 2 jouieui3 91966857 L 5 1eujeu13
5. o Channel 1 LED1 2 1 02 2 1 03 2 re LED1 1 LE LE LED4 1 PC 104 Plus i 5 5 connector Port 1 Port 2 Port 3 Port 4 PC 104 connector 2002 by MPL AG 12 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN 3 2 SWITCH SETTINGS Default switch settings are in brackets 3 2 1 PC 104 PLUS SLOT SELECTOR SWITCH 3 2 1 1 PC 104 PLUS MODULE STACK Module Slot 4 Module Slot 3 Module Slot 2 Baseboard 3 2 1 2 SINGLE CHANNEL VERSION SPIDERLAN 1P SPIDERLAN 1E Ethernet Controller 1 Module Slot 1 Module Slot 2 Module Slot 3 Module Slot 4 3 2 1 3 DUAL CHANNEL VERSION SPIDERLAN 2P SPIDERLAN 2E SPIDERLAN versions which have 2 network controllers behave like 2 independent PC 104 plus cards Two module slots in the PC 104 plus stack will be occupied Ethernet Controller 1 Ethernet Controller 2 Module Slot 1 Module Slot 2 Module Slot 2 Module Slot 3 Module Slot 3 Disabled Module Slot 4 Disabled 2002 by MPL AG 13 MEH 10095 001 Rev B M PL SPIDERLAN High Tech Made in Switzerland US E R MAN UAL 3 3 CONNECTORS 3 3 1 CONNECTOR FOR SPIMS 4 MODULE SPIDERLAN 1E SPIDERLAN 2E Pin number Signal Description 6 GND 8 Geud X 9 RXD2 Receive Data Bt2 Figure 3 6 2002 by MPL AG 14 MEH 10095 001 Rev B
6. 6 2 PRODUCTION SERIAL AND REVISION NUMBER To get the actual production revision number of your device please see the label on the bottom of the SPIDERLAN housing MPL SPIDERLAN S N 1000 A Production Production Serial Number Revision Number 2002 by MPL AG 25 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN This page is intentionally left blank 2002 by MPL AG 26 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN This page is intentionally left blank 2002 by MPL AG 27 10095 001 Rev B USER MANUAL SPIDERLAN High Tech Made in Switzerland COPYRIGHT AND REVISION HISTORY Copyright 2002 by MPL AG Elektronikunternehmen All rights reserved Reproduction of this document in part or whole by any means is prohibited without written permission from MPL AG Elektronikunternehmen This manual reflects Revision A of the SPIDERLAN DISCLAIMER The information contained herein is believed to be accurate as of the date of this publication however MPL AG will not be liable for any damages including indirect or consequential arising out of the application or use of any product circuit or software described herein MPL AG reserves the right to make changes to any product herein to improve reliability function or design TRADEMARKS Brand or product names are trademarks and registered trademarks of their respective hol
7. High Tech Made in Switzerland SPIDERLAN si PL 4 USER MANUAL PC 104 PLUS 4 8 PORT FAST ETHERNET SWITCH MODULE The SPIDERLAN family consists of universal high performance compact and robust ethernet modules for the industrial use SPIDERLAN unifies two complete 10 100BaseTX Fast Ethernet Adapters on a single PC 104 plus board Each network controller is combined with a integrated 5 port layer 2 switch subsystem So the board comes with up to eight 2x4 fully independent operating external 10 100BASE TX ports all available on RJ45 connectors Switched networking minimizes network loading eliminates collisions and enables true deterministic communications SPIDERLAN is available as compact single PC 104 P lus module with connectors onboard or with separated switch sub modules for front panel assemblies All these features make SPIDERLAN to the ideal solution for industrial network applications like routers firewalls etc Features Up to 2 AMD PCNet Fast Jl Fast Ethernet controllers on a single board High performance bus mastering for low CPU and bus utilisation PCI specification 2 2 compliant 5 volt only power supply up to 2 integrated 5 port layer 2 ethernet switch subsystems up to 8 2x4 external 10 100BaseTX ports onboard RJ45 connectors or separated external switch sub modules IEEE 802 3u autonegotiation 10 100 Mbps half full duplex operation Full duplex IEEE 802 3x support MDI MDI X autocrossover functionality
8. M PL SPIDERLAN High Tech Made in Switzerland US E R MAN UAL 3 3 2 QUAD RJ45 CONNECTORS 2 RX J Recivedaaa 3 1 75 Ohm common mode termination Transmit data CMT 75 Ohm common mode termination Port 2 Pin number Description 1 Receive data Receive data Transmit data 75 Ohm common mode termination Transmit data n CMT 75 Ohm common mode termination 1 ET ETT E Port 3 Pin number Description 1 Receive data Figure 3 10 Receive data Transmit data 75 Ohm common mode termination Transmit data CMT 75 Ohm common mode termination Port 4 Pin number Description 1 Receive data Receive data Transmit data 75 Ohm common mode termination WIN 7 7 7 Pin number Description pie I Receive data Receive data Transmit data 75 ohm common mode termination 6 Transmit data 8027 280 75 Ohm common mode termination Transmit data 75 Ohm common mode termination 2002 by MPL AG 15 MEH 10095 001 Rev B M PL SPIDERLAN High Tech Made in Switzerland US E R MAN UAL 3 3 3 PC 104 INTERFACE PIN NUMBERS Number 0 e Loun 00 4 505 jut 6 50 2 1 9 5 50171 LENDER LAI7 sbo 42 DROO 20 15 117 syscek Ch saio ie de OE 22 59
9. WARNING There are no user serviceable components on the SPIDERLAN 1 3 ELECTROSTATIC DISCHARGE ESD PROTECTION Various electrical components within the product are sensitive to static and electrostatic discharge ESD Even a non sensible static discharge can be sufficient to destroy or degrade a component s operation With an open housing do not touch any electronic components Handle or touch only the unit chassis 1 4 EQUIPMENT SAFETY Great care is taken by MPL that all its products are thoroughly and rigorously tested before leaving the factory to ensure that they are fully operational and conform to specification However no matter how reliable a product there is always the remote possibility that a defect may occur The occurrence of a defect on this device may under certain conditions cause a defect to occur in adjoining and or connected equipment It is the user s responsibility to ensure that adequate protection for such equipment is incorporated when installing this device MPL accepts no responsibility whatsoever for such kind of defects however caused 2002 by MPL AG 4 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN 2 GENERAL INFORMATION AND SPECIFICATIONS This chapter provides a general overview over the SPIDERLAN and its features It outlines the electrical and physical specifications of the product its power requirements and a list of related publications 2 1 SPECIFICATIO
10. 10095 001 Rev B High Tech Made in Switzerland EEN 3 PREPARATION FOR USE 3 1 PARTS LOCATION 3 1 1 EXTERNAL SWITCH VERSION SPIDERLAN 1E SPIDERLAN 2E 3 1 1 1 BASEBOARD PC 104 Plus PC 104 connector connector LED6 LEDS Channel 2 LED6 SPIMS4 submodule connector 90 mm PC 104 PC 104 Plus connector be YS connector PC 104 Plus Slot Selector Switch SPIMS4 submodule connector LEDS LED6 Channel 1 PC 104 connector PC 104 Plus connector 2002 by MPL AG 10 MEH 10095 001 Rev B High Tech Made in Switzerland SPIDERLAN USER MANUAL en 3 1 1 2 SWITCH SUBMODULE SPIMS4 LED1 2 LED22 LED1 1 LED2 1 LED3 1 LED3 2 LED4 1 LED4 2 4x 10 100BaseTX RJ45
11. 2 LED indicators for all ports 2002 by MPL AG 1 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN TABLE OF CONTENTS INTRODUCTION ABOUT THIS MANUAL SAFETY PRECAUTIONS AND HANDLING ELECTROSTATIC DISCHARGE ESD PROTECTION EQUIPMENT SAFETY GENERAL INFORMATION AND SPECIFICATIONS 2 1 SPECIFICATIONS PHYSICAL POWER 2 2 VERSION INFORMATION DIMENSIONS SWITCH SUBMODULE SPIMS4 ONBOARD SWITCH VERSION SPIDERLAN 1P SPIDERLAN 2P 3 PREPARATION FOR USE PARTS LOCATION EXTERNAL SWITCH VERSION SPIDERLAN 1E SPIDERLAN 2E BASEBOARD SWITCH SUBMODULE SPIMS4 ONBOARD SWITCH VERSION SPIDERLAN 1P SPIDERLAN 2P ITCH SETTINGS PC 104 PLUS SLOT SELECTOR SWITCH PC 104 PLUS MODULE STACK SINGLE CHANNEL VERSION SPIDERLAN 1P SPIDERLAN 1E DUAL CHANNEL VERSION SPIDERLAN 2P SPIDERLAN 2E 3 3 CONNECTORS 3 3 1 CONNECTOR FOR SPIMS 4 MODULE SPIDERLAN 1E SPIDERLAN 2E 3 3 2 QUAD RJ45 CONNECTORS 3 3 3 PC 104 INTERFACE PIN NUMBERS 3 3 4 PC 104 PLUS INTERFACE PIN NUMBERS 4 OPERATION BLOCK DIAGRAM ONBOARD SWITCH VERSION SPIDERLAN 1P SPIDERLAN 2P EXTERNAL SWITCH VERSION SPIDERLAN 1E SPIDERLAN 2E LED INDICATORS 2 INTEGRATED RJ45 CONNECTOR INDICATORS 4 2 1 1 LINK ACTIVITY GREEN 4 2 1 2 10 100 MBIT YELLOW 4 2 2 EXTERNAL SWITCH VERSION SPIDERLAN 1E SPIDERLAN 2E 4 2 2 1 LED5 TRANSMIT ACTIVITY 4 2 2 2 LED6 RECEIVE ACTIVITY 4 3 5 PORT LAYER 2 SWITCH SUBSYSTEM 4 3 1 ADVANTAGES O
12. consumption Typ 2 5W single controller 4ports SW dual controller 8 ports ENVIRONMENT Temperature range 0 C to 70 C 32 F to 158 F optional 40 C to 75 C 40 F to 185 F Relative humidity 10 90 non condensing 2 2 VERSION INFORMATION SPIDERLAN 1P single ethernet controller with onboard switch subsystem SPIDERLAN 2P dual ethernet controllers each with onboard switch subsystem SPIDERLAN 1E single ethernet controller with separated switch sub module SPIDERLAN 2E dual ethernet controllers with two separated switch sub modules 2002 by MPL AG 6 MEH 10095 001 Rev B M PL SPIDERLAN High Tech Made in Switzerland US E R MAN UAL 2 3 DIMENSIONS 2 3 1 EXTERNAL SWITCH VERSION SPIDERLAN 1E SPIDERLAN 2E 2 3 1 1 BASEBOARD AA AAA
13. sense is to prevent other stations from sending out packets and keeps other stations in carrier sense deferred state If the port has packets to send during a back pressure situation the carrier sense type back pressure will be interrupted and those packets will be transmitted instead If there are no more packets to send carrier sense type back pressure will be active again until switch resources free up If a collision occurs the binary exponential back off algorithm is skipped and carrier sense is generated immediately reducing the chance of further colliding and maintaining carrier sense to prevent reception of packets This scheme is better than collision based back pressure The Switch controller also supports collision based flow control If the destination port is congested the incoming packets will be collided to achieve back pressure 4 3 5 BROADCAST STORM PROTECTION The switch controller has an intelligent way to protect the switch system from receiving too many broadcast packets Broadcast packets will be forwarded to all ports except the source port and thus will use too many Switch resources bandwidth and available space in transmit queues Broadcast or multicast packets will be discarded if the number of those packets exceeds 2596 of the network line rate in preset period of time If the preset period expires it will then resume receiving broadcast or multicast packets until the threshold is reached 4 3 6 AUTO NEGOTIATION
14. the table will be deleted first to make room for the new entry 4 3 2 2 MIGRATION The look up engine also monitors whether a station is moved If it happens it will update the table accordingly Migration happens when the following conditions are met 1 The received packet s source MAC address SA is in the table but the associated source port information is different 2 The received packet is good the packet has no receiving errors and is of legal length The look up engine will update the existing record in the table with the new source port information 4 3 2 3 AGING Aging is the amount of time the switch waits until it removes a source MAC address SA from the look up table due the fact that the source address has not initiated a transmission within the aging time The look up engine will update the time stamp information of a record whenever the corresponding source MAC address SA appears The time stamp is used in the aging process If a record is not updated for a period of time the look up engine will then remove the record from the table The look up engine constantly performs the aging process and will continuously remove aging records The aging period is set to 300 seconds 2002 by MPL AG 21 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN 4 3 2 4 FORWARDING The packets will be forwarded as follows 1 Ifthe destination MAC address DA look up results is a match t
15. All ports conforms to the auto negotiation protocol as described by the 802 3 committee Auto negotiation allows UTP Unshielded Twisted Pair link partners to select the best common mode of operation In auto negotiation the link partners advertise capabilities across the link to each other If auto negotiation is not supported or the link partner is forced to bypass auto negotiation then the mode is set by observing the signal at the receiver This is known as parallel mode because while the transmitter is sending auto negotiation advertisements the receiver is listening for advertisements or a fixed signal protocol The flow for the link set up is depicted below 2002 by MPL AG 23 MEH 10095 001 Rev B USER MANUAL SPIDERLAN High Tech Made in Switzerland 5 SOFTWARE 5 4 DEVICE DRIVERS Drivers for different operating systems are available 5 1 1 LINKS TO THE LATEST DRIVERS The latest driver versions are also available on the internet AMD Connectivity Solutions Networking PCNet Family device drivers http www amd com Note Links may have been changed in the meantime The latest links can also be found on the MPL homepage http www mpl ch 2002 by MPL AG 24 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN 6 SUPPORT INFORMATION 6 1 MPL AG In case of questions contact MPL AG or your local distributor MPL AG homepage www mpl ch Email address support mopl ch
16. F SWITCHED NETWORKING 4 3 2 ADDRESS LOOK UP 4 3 2 1 LEARNING 4 3 2 2 4 3 2 3 4 3 2 4 4 3 3 2002 by MPL AG 2 MEH 10095 001 Rev B SPIDERLAN High Tech Made in Switzerland U S E R MAN UAL 4 3 4 MAC OPERATION 4 3 4 1 INTER PACKET GAP IPG 4 3 4 2 BACKOFF ALGORITHM 4 3 4 3 LATE COLLISION 4 3 4 4 ILLEAGAL FRAMES 4 3 4 5 FLOW CONTROL 4 3 4 6 HALF DUPLEX BACK PRESSURE 4 3 5 BROADCAST STORM PROTECTION 4 3 6 AUTO NEGOTIATION SOFTWARE 5 1 DEVICE DRIVERS 5 1 1 LINKS TO THE LATEST DRIVERS SUPPORT INFORMATION 2002 by MPL AG 3 MEH 10095 001 Rev B USER MANUAL SPIDERLAN High Tech Made in Switzerland 1 INTRODUCTION 1 1 ABOUT THIS MANUAL This manual assists the installation and initialisation procedure by providing all the information necessary to handle and configure the SPIDERLAN The manual is written for technical personnel responsible for integrating the SPIDERLAN into their system 1 2 SAFETY PRECAUTIONS AND HANDLING For personal safety and safe operation of the SPIDERLAN follow all safety procedures described here and in other sections of the manual Power must be removed from the system before installing or removing the SPIDERLAN to prevent the possibility of personal injury electrical shock and or damage to the product Handle the product carefully i e dropping or mishandling the SPIDERLAN can cause damage to assemblies and components Do not expose the equipment to moisture
17. NS ELECTRICAL Ethernet Controller single dual AMD PCNet FAST III ethernet controllers 32 bit PCI bus master supports 3 3V and 5V PCI signalling DMA buffer management unit for low CPU and bus utilisation Large independent RX TX FIFO buffers IEEE802 3 and Blue book ethernet compatible Device drivers for all major operation systems available Ethernet Switch single dual Kendin KS8995E layer 2 ethernet switch chipset 1 internal port connected to onboard ethernet controller 4 external 10 100BaseTX ports 128 kB SRAM for frame buffering 1 4Gps high performance memory bandwidth Lookup engine supports 1k absolute MAC addresses Automatic address learning aging and migration Broadcast storm protection Physical Hardware based 10 100 full half flow control and autonegotiation e Full duplex IEEE802 3x flow control e Half duplex back pressure flow control Connectors single dual onboard quad RJ45 connectors or optionally 40 pin mini headers for the connection of external switch sub modules Indicators e indicators for link status activity and 10 100 Mbps operation for each port 2002 by MPL AG 5 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN PHYSICAL POWER Form factor Length x width x height 95 89 mm 3 775 x 90 17 mm 3 550 x 13 5 mm max please refer to section 2 2 Weight 120g 0 265165 fully equipped SPIDERLAN 2P Input Power 5VDC 5 Power
18. ch network segment are mapped and only the necessary traffic is allowed to pass through the switch Additionally bad or misaligned packets are prevented from spreading by not forwarding them Packet filtering and regeneration enables to split the network into separate collision domains In switched networks each segment is an independent collision domain This allows greater distances more nodes and lowers the overall collision rates Another advantage is that the ports can work with different data rates 10 or 100Mbit or with half full duplex 4 3 2 ADDRESS LOOK UP The switch controller provides a look up engine with a internal look up table that stores MAC addresses and their associated information It contains 1K full CAM with 48 bit address plus switching information It is guaranteed to learn 1K addresses and distinguishes itself from hash based look up tables which depending on the operating environment and probabilities may not guarantee the absolute number of addresses it can learn 4 3 2 1 LEARNING The look up engine will update its table with a new entry if the following conditions are met 1 The received packet s source MAC address SA does not exist in the look up table 2 The received packet is good the packet has no receiving errors and is of legal length The look up engine will insert the qualified source MAC address SA into the table along with the port number time stamp If the table is full the last entry of
19. ders Our local distributor 2002 by MPL AG 28 MEH 10095 001 Rev B
20. he destination port information will be used to determine where the packet goes 2 If the destination MAC address DA look up result is a miss the packet will be forwarded to all other ports except the port that received the packet 3 All the multicast and broadcast packets will be forwarded to all other ports except the source port The following packets will not be forwarded Error packets These include framing errors FCS errors alignment errors and illegal size packet errors 802 3x pause frames These packets will be intercepted and do the appropriate actions Local packets Based on destination address DA look up If thedestination port from the look up table matches the port where the packet wasfrom the packet is defined as local 4 3 3 SWITCHING ENGINE A very high performance switching engine moves the data to and from the MAC s and packet buffers It operates in store and forward mode while the efficient switching mechanism reduces overall latency It has in internal buffer for frames that is 32Kx32 128KB This resource is shared between the five ports Each buffer is sized at 128Bytes and therefore there are a total of 1024 buffers available A per port maximum is set to 205 buffers per port 4 3 4 MAC OPERATION The switch controller strictly abides by IEEE 802 3 standard to maximize compatibility 4 3 4 1 INTER PACKET GAP IPG If a frame is successfully transmitted the 96 bit time IPG is measured betwee
21. it Receive Activity Please refer to section 3 1 port 1 LED 1 1 port 2 LED2 1 port 3 LED3 1 port 4 LED4 1 4 2 1 2 10 100 MBIT YELLOW On 100MBit Off 10MBit Please refer to section 3 1 port 1 LED1 2 port 2 LED2 2 port 3 LED3 2 port 4 LED4 2 4 2 2 EXTERNAL SWITCH VERSION SPIDERLAN 1E SPIDERLAN 2E 4 2 2 1 LED5 TRANSMIT ACTIVITY This LED indicate transmit activity of the network controller data transmission to a cable connected external switch submodule SPIMS4 For the location of the LED please refer to section 3 1 1 1 On Receive Activity Off No Activity 4 2 2 2 LED6 RECEIVE ACTIVITY This LED indicate receive activity of the network controller data reception from a cable connected external switch submodule SPIMS4 For the location of the LED please refer to section 3 1 1 1 On Transmit Activity Off No Activity 2002 by MPL AG 20 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN 4 3 5 PORT LAYER 2 SWITCH SUBSYSTEM Each of the SPIDERLAN NIC channels can be equipped with complete 5 port switch subsystem 1 Port is connected to onboard NIC and 4 ports are available on RJ45 connectors 4 3 1 ADVANTAGES OF SWITCHED NETWORKING Unlike hubs switches operate at the data link layer layer 2 of the OSI reference model Each packet which is received will be examined and processed rather then simply repeated The MAC addresses of the nodes residing on ea
22. n the two consecutive TXEN If the current packet is experiencing collision the 96 bit time IPG is measured from CRS and the next TXEN 4 3 4 2 BACKOFF ALGORITHM The switch controller implements the IEEE Std 802 3 binary exponential back off algorithm and aggressive mode back off 4 3 4 3 LATE COLLISION If a transmit packet experiences collisions after 512 bit times of the transmission the packet will be dropped 4 3 4 4 ILLEAGAL FRAMES Illegal size frames will be discarded as defined by the IEEE Std 802 3u including short frames less than 64 bytes long frames greater than 1522 bytes and FCS error frames VLAN tagged frames are treated as regular frames and any VLAN related functions will not performed The switch should be treated as a single VLAN domain VLAN frames will be dropped if the size is larger than 1522 bytes and non VLAN frames if the size is larger than 1518 bytes 2002 by MPL AG 22 MEH 10095 001 Rev B USER MANUAL High Tech Made in Switzerland SPIDERLAN 4 3 4 5 FLOW CONTROL Standard 802 3x flow control frames on both transmit and receive sides are supported On the receive side if a pause control frame is received the next normal frame will not be transmitted until the timer specified in the pause control frame expires If another pause frame is received before the current timer expires the timer will be updated with the new value in the second pause frame During this period being flow co
23. ntrolled only flow control packets from the switch controller will be transmitted On the transmit side the switch controller has intelligent and efficient ways to determine when to invoke flow control The flow control is based on availability of the system resources including available buffers available transmit queues and available receive queues A port which just received a packet will be flow controlled if the destination port resource is being used up A flow control frame XOFF will be issued containing the maximum pause time defined in IEEE standard 802 3x Once the resource is freed up the other flow control frame XON with zero pause time will be send out to turn off the flow control turn on transmission to the port A hysterisis feature is provided to prevent flow control mechanism from being activated and deactivated too many times ports will flow controlled if the receive queue becomes full 4 3 4 6 HALF DUPLEX BACK PRESSURE Half duplex back pressure Note not in 802 3 standards is also provided The activation and deactivation conditions are the same as the above in full duplex mode If back pressure is required the switch controller will send preambles to defer other stations transmission carrier sense deference To avoid jabber and excessive deference defined in 802 3 standard after a certain time it will discontinue the carrier sense but it will raise the carrier sense quickly This short silent time no carrier
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