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Publication date: Mar. 2016

33600 Rev B

28

Frame Reception

In essence, the frame reception is the same in both operations of half duplex

and full duplex, except that full-duplex operation uses two buffers to transmit and
receive the frame independently. The receiving node always “listens” if there is
traffic running over the medium when it is not receiving a frame. When a frame
destined for the target device comes, the receiver of the target device begins
receiving the bit stream, and looks for the PRE (Preamble) pattern and Start-of-
Frame Delimiter (SFD) that indicates the next bit is the starting point of the MAC
frame until all bit of the frame is received.

For a received frame, the MAC will check:

1.

If it is less than one slotTime in length, i.e. short packet, and if yes, it

will be discarded by MAC because, by definition, the valid frame must
be longer than the slotTime. If the length of the frame is less than one
slotTime, it means there may be a collision happened somewhere or
an interface malfunctioned in the LAN. When detecting the case, the
MAC drops the packet and goes back to the ready state.

2.

If the DA of the received frame exactly matches the physical address
that the receiving MAC owns or the multicast address designated to
recognize. If not, discards it and the MAC passes the frame to its client
and goes back to the ready state.

3.

If the frame is too long. If yes, throws it away and reports frame Too
Long.

4.

If the FCS of the received frame is valid. If not, for 10M and 100M
Ethernet, discards the frame. For Gigabit Ethernet or higher speed
Ethernet, MAC has to check one more field, i.e. extra bit field, if FCS is
invalid. If there is any extra bits existed, which must meet the
specification of IEEE802.3. When both FCS and extra bits are valid,
the received frame will be accepted, otherwise discards the received
frame and reports frameCheckError if no extra bits appended or
alignmentError if extra bits appended.

5.

If the length/type is valid. If not, discards the packet and reports
lengthError.

6.

If all five procedures above are ok, then the MAC treats the frame as
good and de-assembles the frame.

What if a VLAN tagging is applied?

VLAN tagging is a 4-byte long data immediately following the MAC source

address. When tagged VLAN is applied, the Ethernet frame structure will have a
little change shown as follows.

Only two fields, VLAN ID and Tag control information are different in

comparison with the basic Ethernet frame. The rest fields are the same.

The first two bytes is VLAN type ID with the value of 0x8100 indicating the

received frame is tagged VLAN and the next two bytes are Tag Control Information

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Содержание SM24TAT4GPA

Страница 1: ...33600 Rev B www transition com Page 1 of 105 SM24TAT4GPA 24 Port 10 100 1000Base T Managed POE plus Switch User Manual ...

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Страница 3: ... CONTROL LLC 20 3 3 MEDIAACCESS CONTROL MAC 22 3 4 FLOW CONTROL 27 3 5 HOW DOES A SWITCH WORK 30 3 6 VIRTUAL LAN 34 4 OPERATION OF WEB BASED MANAGEMENT 40 4 1 WEB MANAGEMENT HOME OVERVIEW 41 4 2 CONFIGURATION 43 4 2 1 System Information 44 4 2 2 Port Configuration 48 4 2 3 VLAN Mode Configuration 50 4 2 4 VLAN Group Configuration 51 4 2 5 VLAN Port Isolation Configuration 55 4 2 6 PoE 56 4 2 7 Agg...

Страница 4: ... 2 Factory Default 88 4 4 3 Software Upgrade 89 4 4 4 Configuration File Transfer 90 4 4 5 Logout 91 5 MAINTENANCE 92 5 1 RESOLVING NO LINK CONDITION 92 5 2 Q A 92 APPENDIX A TECHNICAL SPECIFICATIONS 96 Revision History Date Revision Apr 2014 A1 Jun 2014 A1 1 Dec 2014 A1 2 March 2016 B ...

Страница 5: ...sion FCC Statement This equipment has been tested and found to comply with the limits for a class A computing device pursuant to Subpart J of part 15 of FCC Rules which are designed to provide reasonable protection against such interference when operated in a commercial environment European Community CE Electromagnetic Compatibility Directive This equipment has been tested and found to comply with...

Страница 6: ......

Страница 7: ...s guide also covers management options and detailed explanation about hardware and software functions Overview of this user s manual Chapter 1 Introduction describes the features of the SM24TAT4GPA Chapter 2 Installation Chapter 3 Operating Concept and Management Chapter 4 Operation of Web based Management Chapter 5 Maintenance Appendix A Technical Specifications ...

Страница 8: ...ch Power Management two techniques to detect the client idle and cable length automatically and provides the different power It could efficient to save the switch power and reduce the power consumption PoE 24 PoE ports allow power to be supplied to end devices such as Wireless Access Points or VoIP Phones directly through the existing LAN cables eliminating costs for additional AC wiring and reduc...

Страница 9: ...s System Power TP Port1 24 LINK ACT PoE 10 100 1000Mbps SFP Port 21 22 23 24 SFP LINK ACT Management Supports concisely the status of port and easily port configuration Supports per port traffic monitoring counters Supports a snapshot of the system Information when you login Supports port mirror function Supports the static trunk function Supports 802 1Q VLAN Supports user management and limits on...

Страница 10: ...d Plugs There are 20 Port 10 100 1000Base T 4 100 1000 SFP RJ 45 Combo slots on the front panel of the switch The LED display area located on the left side of the panel contains a Power LED which indicates the power status and 24 ports working status of the switch Fig 1 1 Full View of SM24TAT4GPA ...

Страница 11: ... ACT Green Lit when connection with remote device is good Blinks when any traffic is present SPD Green Yellow Off Lit Green when TP link on 1000Mbps speed Lit Yellow when TP link on 10 100Mbps speed Off when no link occur 1000SX LX Gigabit Fiber Port 21 22 23 24 LED LINK ACT Green Lit when SFP connection with remote device is good Blinks when any traffic is present SPD Green Yellow Off Lit Green w...

Страница 12: ...Publication date Mar 2016 33600 Rev B 6 1 4 2 the Rear Panel Fig 1 3 Rear View of SM24TAT4GPA ...

Страница 13: ...this section TP Port and Cable Installation In the switch TP port supports MDI MDI X auto crossover so both types of cable straight through Cable pin outs for RJ 45 jack 1 2 3 6 to 1 2 3 6 in 10 100M TP 1 2 3 4 5 6 7 8 to 1 2 3 4 5 6 7 8 in Gigabit TP and crossed over Cable pin outs for RJ 45 jack 1 2 3 6 to 3 6 1 2 can be used It means you do not have to tell from them just plug it Use Cat 5 grad...

Страница 14: ...t matter whether any connection plugged into the switch or not when power on even modules as well After the power is on all LED indicators will light up and then all off except the power LED still keeps on This represents a reset of the system Firmware Loading After resetting the bootloader will load the firmware into the memory It will take about 30 seconds and then flash all the LED and automati...

Страница 15: ...ocols such as 802 1d 802 1q LACP and so on The fiber TP cables and devices bit time delay round trip are as follows 1000Base X TP Fiber 100Base TX TP 100Base FX Fiber Round trip Delay 4096 Round trip Delay 512 Cat 5 TP Wire 11 12 m Cat 5 TP Wire 1 12 m Fiber Cable 1 0 m Fiber Cable 10 10 m TP to fiber Converter 56 Bit Time unit 1ns 1sec 1000 Mega bit Bit Time unit 0 01µs 1sec 100 Mega bit Table 2 ...

Страница 16: ...using The switch supports both port based VLAN and tag based VLAN They are different in practical deployment especially in physical location The following diagram shows how it works and what the difference they are Case2a Port based VLAN See Fig 2 3 1 The same VLAN members could not be in different switches 2 Every VLAN members could not access VLAN members each other 3 The switch manager has to a...

Страница 17: ...cess VLAN1 and VLAN3 members but they could access VLAN4 members 3 VLAN3 members could not access VLAN1 VLAN2 and VLAN4 4 VLAN4 members could not access VLAN1 and VLAN3 members but they could access VLAN2 members Case3a The same VLAN members can be at different switches with the same VID See Fig 2 5 Fig 2 4 Port based VLAN Diagram Fig 2 5 Attribute based VLAN Diagram ...

Страница 18: ...4GPA through Ethernet Port Before you manage with the switch you need to configure the IP address or to know the IP address of the switch Then follows the procedures listed below 1 Set up a physical link between the configured the switch and a PC by a qualified UTP Cat 5 cable with RJ 45 connector Note If PC directly connects to the switch you have to setup the same subnet mask between them But su...

Страница 19: ...unique in the same LAN Here the term of IP address we used is version 4 known as IPv4 Network identifier Host identifier Fig 2 8 IP address structure With the classful addressing it divides IP address into three classes class A class B and class C The rest of IP addresses are for multicast and broadcast The bit length of the network prefix is the same as that of the subnet mask and is denoted as I...

Страница 20: ...r more information Subnet mask It means the sub division of a class based network or a CIDR block The subnet is used to determine how to split an IP address to the network prefix and the host address in bitwise basis It is designed to utilize IP address more efficiently and ease to manage IP network For a class B network 128 1 2 3 it may have a subnet mask 255 255 0 0 in default in which the first...

Страница 21: ... 255 128 contains 126 members in the sub netted network Another is that the length of network prefix equals the number of the bit with 1s in that subnet mask With this you can easily count the number of IP addresses matched The following table shows the result Prefix Length No of IP matched No of Addressable IP 32 1 31 2 30 4 2 29 8 6 28 16 14 27 32 30 26 64 62 25 128 126 24 256 254 23 512 510 22 ...

Страница 22: ...etwork applications the subnet mask may look like 255 255 255 240 This means it is a small network accommodating a maximum of 15 nodes in the network Default gateway For the routed packet if the destination is not in the routing table all the traffic is put into the device with the designated IP address known as default router Basically it is a routing policy For assigning an IP address to the swi...

Страница 23: ...on of the switch please refer to Appendix A The switch is suitable for the following applications Central Site Remote site application is used in carrier or ISP See Fig 2 10 Peer to peer application is used in two remote offices See Fig 2 11 Office network See Fig 2 12 Fig 2 10 is a system wide basic reference connection diagram This diagram demonstrates how the switch connects with other network ...

Страница 24: ...Publication date Mar 2016 33600 Rev B 18 Fig 2 12 Office Network Connection Fig 2 11 Peer to peer Network Connection ...

Страница 25: ...n 1998 Gigabit Ethernet was rolled out and provided 1000Mbps Now 10G s Ethernet is under approving Although these Ethernet have different speed they still use the same basic functions So they are compatible in software and can connect each other almost without limitation The transmission media may be the only problem Fig 3 1 IEEE 802 3 reference model vs OSI reference mode In Fig 3 1 we can see th...

Страница 26: ...trol or bridge relay entity Logical link control supports the interface between the Ethernet MAC and upper layers in the protocol stack usually Network layer which is nothing to do with the nature of the LAN So it can operate over other different LAN technology such as Token Ring FDDI and so on Likewise for the interface to the MAC layer LLC defines the services with the interface independent of t...

Страница 27: ...C R bit command or response The DSAP and SSAP pair with some reserved values indicates some well known services listed in the table below 0xAAAA SNAP 0xE0E0 Novell IPX 0xF0F0 NetBios 0xFEFE IOS network layer PDU 0xFFFF Novell IPX 802 3 RAW packet 0x4242 STP BPDU 0x0606 IP 0x9898 ARP Table 3 2 LLC type 1 connectionless service LLC type 2 connection oriented service and LLC type 3 acknowledge connec...

Страница 28: ...et MAC address The first bit of the first byte in the Destination address DA determines the address to be a Unicast 0 or Multicast frame 1 known as I G bit indicating individual 0 or group 1 So the 48 bit address space is divided into two portions Unicast and Multicast The second bit is for global unique 0 or locally unique address The former is assigned by the device manufacturer and the later is...

Страница 29: ...dividual address and the left most bit in the SA field is always 0 Length Type This field indicates either the number of the data bytes contained in the data field of the frame or the Ethernet type of data If the value of first two bytes is less than or equal to 1500 in decimal the number of bytes in the data field is equal to the Length Type value i e this field acts as Length indicator at this m...

Страница 30: ...re inserted and sent first then the next Start of frame Delimiter SFD DA SA and through the data field and FCS field in turn The followings summarize what a MAC does before transmitting a frame 1 MAC will assemble the frame First the preamble and Start of Frame delimiter will be put in the fields of PRE and SFD followed DA SA tag ID if tagged VLAN is applied Ethertype or the value of the data leng...

Страница 31: ... time between the two most distant devices This maximum time is traded off by the collision recovery time and the diameter of the LAN In the original 802 3 specification Ethernet operates in half duplex only Under this condition when in 10Mbps LAN it s 2500 meters in 100Mbps LAN it s approximately 200 meters and in 1000Mbps 200 meters According to the theory it should be 20 meters But it s not pra...

Страница 32: ...lex operation mode both transmitting and receiving frames are processed simultaneously This doubles the total bandwidth Full duplex is much easier than half duplex because it does not involve media contention collision retransmission schedule padding bits for short frame The rest functions follow the specification of IEEE802 3 For example it must meet the requirement of minimum inter frame gap bet...

Страница 33: ... carrier signal on the medium at that time the device will wait for a period of time known as an inter frame gap time to have the medium clear and stabilized as well as to have the jobs ready such as adjusting buffer counter updating counter and so on in the receiver site Once the inter frame gap time expires after the de assertion of carrier sense the MAC transmits data In IEEE802 3 specification...

Страница 34: ...ticast address designated to recognize If not discards it and the MAC passes the frame to its client and goes back to the ready state 3 If the frame is too long If yes throws it away and reports frame Too Long 4 If the FCS of the received frame is valid If not for 10M and 100M Ethernet discards the frame For Gigabit Ethernet or higher speed Ethernet MAC has to check one more field i e extra bit fi...

Страница 35: ...process it in the same way as a basic normal frame For a VLAN enabled LAN all involved devices must be equipped with VLAN optional function At operating speeds above 100 Mbps the slotTime employed at slower speeds is inadequate to accommodate network topologies of the desired physical extent Carrier Extension provides a means by which the slotTime can be increased to a sufficient value for the des...

Страница 36: ...he same slot time the signals will collide referred to as collision The arbitrator will arbitrate who should gain the media The arbitrator is a distributed mechanism in which all stations contend to gain the media Please refer to What s the Ethernet for more details In Fig 3 6 assumed in half duplex you will see some ports of the switch are linked to a shared HUB which connects many hosts and some...

Страница 37: ...hat s more when operating in full duplex mode the distance can reach farther than half duplex because it is not limited by the maximum propagation delay time 512 bits time If fiber media is applied the distance can be up to tens of kilometers Traffic Aggregation Traffic aggregation is to aggregate the bandwidth of more than one port and treat it as a single port in the LAN This single port possess...

Страница 38: ...time period is more than the aging time the entry will be marked invalid The vacancy is now available for other new MAC Both learning and forwarding are the most important functions in a switch Besides that VLAN can be one of the rules to forward the packet There are ingress rule and egress rule applied The ingress rule is used to filter the incoming packet by VLAN ID and so on and to decide wheth...

Страница 39: ... a priority level say 2 4 and so on The WRR will transmit the packet with the weight So the packet of each priority level can be allocated a fixed bandwidth Bandwidth rating Bandwidth rating is the limitation set by administrator and it can be applied to those with SLA Bandwidth rating can be total bandwidth types of service of a port with many steps The switch supports by port Ingress and Egress ...

Страница 40: ... outside the LAN a router is needed which always lies on the edge of the LAN For a layer 2 VLAN it assumes it is a logical subset of a physical LAN separated by specific rules such as tag port MAC address and so on In other words they can communicate with each other between separated small physical LANs within a LAN but can not be between any two separated logical LANs In the figure above all stat...

Страница 41: ...do Basically VLAN can afford offering at least 3 benefits move and change users reduce broadcast traffic and increase performance Security Besides VLAN can highly reduce the traffic congestion and increase total performance because there are no more too many users in the same broadcast domain There are many types of VLAN applied Most popular is port based VLAN tag based VLAN and protocol based VLA...

Страница 42: ...t priority CFI Canonical Format Indicator 1 bit long It is used to encapsulate a token ring packet to let it travel across the Ethernet Usually it is set to 0 VLAN ID 12 bits long 0 means no VLAN ID is present 1 means default VLAN 4095 reserved VLAN tagged frame An Ethernet frame carrying VLAN tag field contains VLAN identification without the value of 0 and 4095 and priority information Priority ...

Страница 43: ... VLAN The classification rule is described as follows 1 If the VID of the packet is null VID VID 0 or this packet is an untagged packet a If there are still some other ways e g protocol MAC address application IP subnet etc to classify the incoming packets beside port based classification in implement and these approaches can offer non zero VID then use the value of VID offered by other classifica...

Страница 44: ...same Filtering Database In IVL VLANs use different FIDs Any VID can be assigned to the same FID by administrator How does a Tagged VLAN work If the ingress filtering is enabled and when a packet is received VLAN bridge will first check if the VID of the packet presents 1 If the packet has a non zero VID VLAN bridge will apply this VID as the VLAN ID of the packet in the network 2 For a packet with...

Страница 45: ...assigns IP address to each VLAN Usually we use 10 x x x as internal IP block Because there are total four VLANs in the network we must assign 4 IP blocks to each of them Name VID Network Address Marketing 2 10 1 2 0 24 Service 3 10 1 3 0 24 Sales 4 10 1 4 0 24 Administration 1 10 1 1 0 24 Table 3 6 Here we apply the subnet mask 255 255 255 and each VLAN is capable of supporting 254 nodes ...

Страница 46: ... 192 168 1 77 Subnet Mask 255 255 255 0 Default Gateway 192 168 1 254 Password Admin Table 4 1 When the configuration of your Switch is finished you can browse it by the IP address you set up For instance type http 192 168 1 77 in the address row of a browser then the following screen see Fig 4 1 would show up and ask for your password input for login and access authentication The default password...

Страница 47: ...t panel of the switch Linked ports will be displayed in green color and linked off ones will be in black For the optional modules the slots with no module will only show covered plates the other slots with installed modules would present modules The images of modules would depend on the ones you insert Vice versa if ports are disconnected they will show just in black On the left side the main menu...

Страница 48: ...Publication date Mar 2016 33600 Rev B 42 Configuration Monitoring Maintenance Root ...

Страница 49: ...e Configuration VLAN Group Configuration VLAN Isolation PoE Aggregation IGMP Snooping Mirroring Qos Loop detection Broadcast Storm Protection and SNMP System Information Ports Configuration VLAN Mode VLAN Group VLAN Isolation PoE Broadcast Strom Protection Aggregation IGMP Snooping Mirroring Quality of Service Loop Detection SNMP Configuration RSTP STP ...

Страница 50: ...Rev B 44 4 2 1 System Information System configuration is one of the most important functions Without a proper setting network administrator would not be able to manage the device The switch supports manual IP address setting Fig 4 3 ...

Страница 51: ...AC Address It is the Ethernet MAC address of the management agent in this switch Serial Number The serial number is assigned by the manufacturer Active IP Address Show the active IP address of this switch Active Subnet Mask Show the active subnet mask of this switch Active Gateway Show the active gateway of this switch DHCP Server Show the IP address of the DHCP server Default 0 0 0 0 Lease Time L...

Страница 52: ... communicate with other devices each other But unfortunately the network classes A B and C are all too large to fit for almost all networks hence subnet mask is introduced to solve this problem Subnet mask uses some bits from host address and makes an IP address looked Network address Subnet mask number and host address It is shown in the following figure This reduces the total IP number of a netw...

Страница 53: ... the routing table will be sent to this device unconditionally Default 192 168 1 254 Management VLAN Show the management VLAN number Password Set a password for this switch Up to 16 characters are allowed in this parameter Any alphanumeric character is acceptable Default admin Inactivity Timeout secs Set the auto logout timer The valid value is 0 60 in the unit of minute and a decimal point is not...

Страница 54: ...t Configuration Function description Port Configuration is applied for the settings of the ports on the switch By this function you can set or reset the values for Mode and Flow Control Others you could set the power saving mode for switch power consumption Fig 4 4 Port Configuration ...

Страница 55: ...a is TP the Speed Duplex is comprised of the combination of speed mode 10 100 1000Mbps and duplex mode full duplex and half duplex The following table summarized the function the media supports Media type NWay Speed Duplex 1000M TP ON OFF 10 100 1000M Full for all Half for 10 100 1000M Fiber ON OFF 1000M Full In Auto Speed mode no default value In Forced mode default value depends on your setting ...

Страница 56: ...et coming in or outgoing from any one port of a port based VLAN will be accepted No filtering criterion applies in port based VLAN The only criterion is the physical port you connect to For example for a port based VLAN named PVLAN 1 contains port members Port 1 2 3 4 If you are on the port 1 you can communicate with port 2 3 4 If you are on the port 5 then you cannot talk to them Each port based ...

Страница 57: ...based VLAN mode Function description The VLAN membership configuration for the selected switch can be monitored and modified here Up to 4094 VLANs are supported This page allows for adding and deleting VLANs as well as adding and deleting port members of each VLAN Fig 4 5 1 tag VLAN Mode Fig 4 5 2 Per port configuration ...

Страница 58: ...ets Pvid This PVID range will be 1 4094 Before you set a number x as PVID you have to create a Tag based VLAN with VID x For example if port x receives an untagged packet the switch will apply the PVID assume as VID y of port x to tag this packet the packet then will be forwarded as the tagged packet with VID Role This is an egress rule of the port Here you can choose Access Trunk or Hybrid Trunk ...

Страница 59: ...ed VLAN it will just show the ID Member of the existed port based VLAN group If you are in tag based VLAN it will show the ID VID Member of the existed tag based VLAN group The switch can store the configuration of port based VLAN and tag based VLAN separately When you choose one of VLAN mode the switch will bring you the responded VLAN configuration which keeps the default data You can easily cre...

Страница 60: ...e which depends on your VLAN mode selection Member In modify function this is used to enable or disable if a port is a member of the new added VLAN Enable means it is a member of the VLAN Just tick the check box beside the port x to enable it Add Group Create a new port based VLAN or tag based VLAN which depends on the VLAN mode you choose in VLAN mode function Delete Group Just tick the check box...

Страница 61: ...layer 2 switch as a protected port or a non protected port A destination address on an data packet is matched with a physical address on said layer 2 switch and a forwarding map is generated for the data packet based upon the destination address on the data packet The data packet is then sent to the plurality of ports pursuant to the forwarding map generated based upon whether the ingress port was...

Страница 62: ...ction description In PoE Port Management function user can configure the settings about PoE The switch complies with IEEE 802 3af protocol and be capable of detecting automatically that whether the device linked to the port on the switch is PD Powered Device or not The switch also manage the power supplement based on the Class of the PD and it will stop supplying the power once the power required ...

Страница 63: ...ty then the switch will cease the power supplement from the port with the highest port id 12 1 Allocation W The power is consumed by the port Detection The Detection represents the PoE capacitor detection for the port Legacy Legacy capacitive detection only 4 point IEEE 802 3af 4 point detection only Both IEEE 802 3af 4 point detection followed by Legacy detection Delay time The Delay time is usin...

Страница 64: ...a logical port then this logical port s bandwidth would be as three times high as a single Fast Ethernet port s Function name Aggregation Configuration Function description Display the current setup of Aggregation Trunking With this function user is allowed to add a new trunking group or modify the members of an existed trunking group The load balance mechanism is based on MAC SA DA hash algorism ...

Страница 65: ...Parameter description IGMP Enabled Just tick the check box to enable this function Default disable Router Ports The router ports setting means all IGMP report packets from clients they will be forwarded to specific port to IGMP server connected router Prevent IGMP report transform broadcast to avoid unnecessary bandwidth waste Just tick the check box beside the port x to enable router ports then p...

Страница 66: ...ected it will list the VLAN ID number IGMP Snooping Enabled After IGMP Enabled function start up then user can tick the check box to enable this function Default enable IGMP Querying Enabled After IGMP Enabled function start up then user can tick the check box to enable this function Default enable ...

Страница 67: ...ti ports For example we assume that Port A and Port B are Source Ports and Port C is Mirror Port respectively thus the traffic passing through Port A and Port B will be copied to Port C for monitor purpose Fig 4 12 Mirror ports configuration Parameter description Source Port Set up the port for being monitored Just tick the check box beside the port x and valid port is Port 1 24 Mirror Port Use th...

Страница 68: ...ssed first Function name 802 1p QoS Mode Function description This function will affect the priority of VLAN tag Based on priority of VLAN tag it can arrange 0 7 priorities priorities can map to 4 queues of the switch low normal medium high and possess different bandwidth distribution according to your weight setting Parameter description Prioritize Traffic Five Prioritize Traffic values are provi...

Страница 69: ...omprise a codepoint which is sometimes abbreviated DSCP and the last two bits are left unused DSCP can form total 64 0 63 kinds of Traffic Class based on the arrangement of 6 bit field in DSCP of the IP packet In the switch user is allowed to set up these 64 kinds of Class that belong to any of queue low normal medium high Parameter description Prioritize Traffic Five Prioritize Traffic values are...

Страница 70: ...e Mar 2016 33600 Rev B 64 DSCP Configuration 64 kinds of priority traffic as mentioned above user can set up any of Queue low normal medium high In default Priority 0 63 are mapping to Queue high Fig 4 15 DSCP Setting ...

Страница 71: ...itch receives packet s looping detection frame MAC address the same as oneself from port show Loop detection happens The port will be locked when it received the looping detection frames If you want to resume the locked port please find out the looping path and take off the looping path then select Unlock port and click on Apply to turn on the locked ports Fig 4 16 Loop Detection Configuration ...

Страница 72: ...ort action is to shut down the port State Show the status of the port Protocol Enabled Controls whether Loop Detection is enabled on this switch port When Port No is chosen and enable port s Loop detection the port can detect loop happens and port will be Locked If Loop did not happen port maintains Unlocked Unlock port When ticking the port port locked will be opened and turned into unlocked If n...

Страница 73: ...igured the port will be blocked for a period of time which can be set After a configured time the switch will detect whether the broadcast packets received on the port still exceed the threshold If the broadcast traffic is still higher than the port will be closed for a period of time again If the broadcast traffic is under the threshold the port will re open and forward the packets normally Fig 4...

Страница 74: ...ured the Broadcast Storm Protection enable Unlock Time The period in seconds for which a port will be kept disabled in the event of a loop is detected and the port action is to shut down the port State Show the status on the port Protocol Enabled Controls whether Broadcast Storm Protection is enabled on this switch port Unlock port When ticking the port port locked will be opened and turned into u...

Страница 75: ... passive except issuing the trap information The switch supports a switch to turn on or off the SNMP agent If you set the field SNMP Enable SNMP agent will be started up If the field SNMP is set Disable SNMP agent will be de activated the related Community Name Trap Host IP Address Trap and all MIB counters will be ignored Function name SNMP Configuration Function description This function is used...

Страница 76: ...each function works independently Each function has its own community name Say the community name for Read only works for Read function and can t be applied to other function such as Write and Trap Default SNMP function Disable Default community name for Read public Default community name for Write private Default community name for Trap public System Event The System Event trap enable here is use...

Страница 77: ...Publication date Mar 2016 33600 Rev B 71 This screen is used to display the RSTP system configuration and set the values of the parameters Fig 4 19 RSTP Configuration ...

Страница 78: ...receiving a BPDU before attempting to reconfigure The allowed range is 6 to 40 seconds Default 20 Forward Delay This is the maximum time in seconds a switch will wait before changing states The general rule 2 Forward Delay 1 Max Age 2 Hello Time 1 Default 15 Force version Select RSTP or STP protocol from the drop down list box Function name RSTP Port Configuration Function description Enable or di...

Страница 79: ...ublication date Mar 2016 33600 Rev B 73 4 3 Monitoring There are six functions contained in the monitoring function Monitoring Statistics Overview Detailed Statistics RSTP STP IGMP Status PoE Status Ping ...

Страница 80: ...formation and provides overview of general traffic statistics for all switch ports Fig 4 20 Statistics Overview for all ports Parameter description Tx Rx Bytes The number of received and transmitted bytes per port Tx Rx Frames The number of received and transmitted frames per port Tx Rx Errors The number of frames received in error and the number of incomplete transmissions per port ...

Страница 81: ...ckets The counting number of the packet received RX Octets Total received bytes Rx High Priority Packets Number of Rx packets classified as high priority Rx Low Priority Packets Number of Rx packets classified as low priority Rx Broadcast Show the counting number of the received broadcast packet Rx Multicast Show the counting number of the received multicast packet Rx Broad and Multicast Show the ...

Страница 82: ...mber of the received error packets Rx 64 Bytes Number of 64 byte frames in good and bad packets received Rx 65 127 Bytes Number of 65 126 byte frames in good and bad packets received Rx 128 255 Bytes Number of 127 255 byte frames in good and bad packets received Rx 256 511 Bytes Number of 256 511 byte frames in good and bad packets received Rx 512 1023 Bytes Number of 512 1023 byte frames in good ...

Страница 83: ...o max_length register with valid CRC Rx Fragments Number of short frames 64 bytes with invalid CRC Rx Jabber Number of long frames according tomax_length register with invalid CRC Rx Drops Frames dropped due to the lack of receiving buffer Tx Collisions Number of collisions transmitting frames experienced Tx Drops Number of frames dropped due to excessive collision late collision or frame aging Tx...

Страница 84: ... switch s current bridge priority setting and bridge ID which stands for the MAC address of this switch Hello Time Show the current hello time of the root bridge Hello time is a time interval specified by root bridge used to request all other bridges periodically sending hello message every hello time seconds to the bridge attached to its designated port ...

Страница 85: ...s current max age time Fwd Delay Show the root bridge s forward delay time Topology Show the root bridge s spanning tree topology Root Id Show root bridge ID of this network segment If this switch is a root bridge the This switch is Root will show this switch s bridge ID ...

Страница 86: ...ived V1 Reports When a host receives a group membership query it identifies the groups associated with the query and determines to which groups it belongs The host then sets a timer with a value less than the Max Response Time field in the query for each group to which it belongs It Calculate the number of times of IGMPV1 report V2 Reports When a host receives a group membership query it identifie...

Страница 87: ...determines to which groups it belongs The host then sets a timer with a value less than the Max Response Time field in the query for each group to which it belongs It Calculate the number of times of IGMPV3 report V2 Leaves When a host leaves a group it sends a leave group membership message to multicast routers on the network it show the leaves number ...

Страница 88: ...ormation about the PoE status Fig 4 24 Parameter description Power Reservation The watts are supplied by the PoE The maximal power that the switch can supply Read Only Port No Port number PD Class Each PD is classified according to a class that defines the maximum power the PD will use The PD Class shows the PDs class ...

Страница 89: ...atus shows the port s status PoE not available No PoE chip found PoE not supported for the port PoE turned OFF PoE disabled PoE is disabled by user PoE turned OFF Power budget exceeded The total requested or used power by the PDs exceeds the maximum power the Power Supply can deliver and port s with the lowest priority is are powered down No PD detected No PD detected for the port PoE turned OFF P...

Страница 90: ...description Ping Parameters Target IP address Set up a Target IP address to ping Count Use drop down menu to set number of echo requests to send Four type of number can choose there are 1 5 10 and 20 Default 1 Time Out in secs Use drop down menu to set number of echo requests time out in second Four type numbers can choose there are 1 5 10 and 20 Default 1 NOTE All the functions should press Apply...

Страница 91: ... address Show the active target IP address Status Show the result of the ping status Received replies Show the received replies number of times Request timeouts Show the timeout of request Average Response times In ms Show the average response time in milliseconds ...

Страница 92: ...cation date Mar 2016 33600 Rev B 86 4 4 Maintenance There are five functions contained in the maintenance function Warm Restart Factory Default Maintenance Software Upgrade Configuration File Transfer Logout ...

Страница 93: ...ieve default settings After upgrading software you have to reboot the device to have new configuration take effect The function being discussed here is software reset Function name Warm Restart Function description Reboot the switch Reboot takes the same effect as the Mode button on the front panel of the switch Press Yes button to confirm warm restart function and it will take around thirty 30 se...

Страница 94: ...on Except the IP address setting all settings will be restored to the factory default values when Factory Default function is performed If you want to restore all configurations including the IP address setting to the factory default please press the Mode button on the front panel Note for Mode button You must press the Mode button over 10 seconds to restore the factory default setting Fig 4 27 Fa...

Страница 95: ... 2016 33600 Rev B 89 4 4 3 Software Upgrade Function name Software Upgrade Function description You can just click Browse button to retrieve the file you want in your system to upgrade your switch Fig 4 28 Software Upgrade ...

Страница 96: ...uration File Transfer Function description You can backup your switch s configuration file into your computer folder in case accident happens In addition uploading backup configuration file into a new or a crashed switch can save much time and avoid mistakes Fig 4 29 Configuration Upload Download ...

Страница 97: ...ission If you do not logout and exit the browser the switch will automatically have you logout Besides this manually logout and implicit logout you can set up the parameter of Auto Logout Timer in system configuration function to explicitly ON OFF this logout function Fig 4 30 Parameter description Auto Manual Logout If no action and no key is stroke as well in any function screen more than the mi...

Страница 98: ...ething wrong Please verify the network configuration on Computer C 2 The uplink connection function fails to work The connection ports on another must be connection ports Please check if connection ports are used on that SM24TAT4GPA Please check the uplink setup of the SM24TAT4GPA to verify the uplink function is enabled 3 The console interface cannot appear on the console port connection SM24TAT4...

Страница 99: ...including loss of data arising from any cause or theory Authorized resellers are not authorized to extend any different warranty on transition networks behalf Limited Lifetime Warranty Effective for Products Shipped May 1 1999 and After Every Transition Networks labeled product purchased after May 1 1999 and not covered by a fixed duration warranty will be free from defects in material and workman...

Страница 100: ...lid for 60 days from the date of issuance An invoice will be generated for payment on any unit s not returned within 60 days Upon completion of a demo evaluation test period units must be returned or purchased within 30 days An invoice will be generated for payment on any unit s not returned within 30 days after the demo evaluation period has expired The customer must pay for the non compliant pro...

Страница 101: ...PRESSED OR IMPLIED TRANSITION NETWORKS IS NOT LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY AUTHORIZED RESELLERS ARE NOT AUTHORIZED TO EXTEND ANY DIFFERENT WARRANTY ON TRANSITION NETWORKS S BEHALF ...

Страница 102: ...f duplex ports Any ports can be in disable mode force mode or auto polling mode Supports Head of Line HOL blocking prevention Supports broadcast storm filtering Web based management provides the ability to completely manage the switch from any web browser Supports Port based VLAN and Tag based IEEE802 1Q VLAN Auto aging with programmable inter age time Supports 802 1p Class of Service with 2 level...

Страница 103: ...ver Transmission Mode 10 100Mbps support full or half duplex 1000Mbps support full duplex only Transmission Speed 10 100 1000Mbps for TP 100 1000Mbps for Fiber Full Forwarding Filtering Packet Rate PPS packets per second Forwarding Rate Speed 1 488 000PPS 1000Mbps 148 800PPS 100Mbps 14 880PPS 10Mbps MAC Address and Self learning 8K MAC address Buffer Memory Embedded 512 KB frame buffer Flow Contro...

Страница 104: ... 0 to 40 C Humidity 10 to 90 Dimensions 44 H x 442 W x 211 2 D mm Complies with FCC Part 15 Class A CE Mark Approval Safety Compliance LVD Management Software Specifications System Configuration Auto negotiation support on 10 100Base TX ports Web browser can set transmission speed 10 100Mbps and operation mode Full Half duplex on each port enable disable any port set VLAN group set Trunk Connectio...

Страница 105: ...on Networks 10900 Red Circle Drive Minnetonka MN 55343 USA Tel 952 941 7600 or 1 800 526 9267 Fax 952 941 2322 Copyright 2015 Transition Networks All rights reserved SM24TAT4GPA 24 Port 10 100 1000Base T Managed POE plus Switch User Manual 33600 Rev B ...

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