MONITOR
ARP Table Overview
This chapter introduces the ARP Table.
Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP address) to a physical machine address, also known as a Media Access Control or MAC address, on the local area network.
An IP (version 4) address is 32 bits long. In an Ethernet LAN, MAC addresses are 48 bits long. The ARP Table maintains an association between each MAC address and its corresponding IP address.
ARP Table
Use the ARP table to view IP-to-MAC address mappings and remove specific dynamic ARP entries.
The following table describes the labels in this screen.
label | Description |
|---|---|
Condition | Specify how you want the Switch to remove ARP entries when you click Flush. Select All to remove all of the dynamic entries from the ARP table. Select IP Address and enter an IP address to remove the dynamic entries learned with the specified IP address. Select Port and enter a port number to remove the dynamic entries learned on the specified port. You can enter multiple ports separated by (no space) comma (,) or hyphen (-) for a range. For example, enter “3-5” for ports 3, 4, and 5. Enter “3,5,7” for ports 3, 5, and 7. |
Flush | Click Flush to remove the ARP entries according to the condition you specified. |
Cancel | Click Cancel to return the fields to the factory defaults. |
Index | This is the ARP table entry number. |
IP Address | This is the IP address of a device connected to a Switch port with the corresponding MAC address below. |
MAC Address | This is the MAC address of the device with the corresponding IP address above. |
VID | This field displays the VLAN to which the device belongs. |
Port | This field displays the port to which the device connects. CPU means this IP address is the Switch’s management IP address. |
Age(s) | This field displays how long (in seconds) an entry can still remain in the ARP table before it ages out and needs to be relearned. This shows 0 for a static entry. |
Type | This shows whether the IP address is dynamic (learned by the Switch) or static (manually configured in SYSTEM > IP Setup > IP Setup or NETWORKING > ARP Setup > Static ARP). |
IPv6 Neighbor Table Overview
An IPv6 host is required to have a neighbor table. If there is an address to be resolved or verified, the Switch sends out a neighbor solicitation message. When the Switch receives a neighbor advertisement in response, it stores the neighbor’s link-layer address in the neighbor table. You can also manually create a static IPv6 neighbor entry using the SYSTEM > IPv6 > IPv6 Neighbor Setup screen.
When the Switch needs to send a packet, it first consults other table to determine the next hop. Once the next hop IPv6 address is known, the Switch looks into the neighbor table to get the link-layer address and sends the packet when the neighbor is reachable. If the Switch cannot find an entry in the neighbor table or the state for the neighbor is not reachable, it starts the address resolution process. This helps reduce the number of IPv6 solicitation and advertisement messages.
IPv6 Neighbor Table
Use this screen to view IPv6 neighbor information on the Switch.
The following table describes the labels in this screen.
label | Description |
|---|---|
Index | This field displays the index number of each entry in the table. |
Address | This field displays the IPv6 address of the Switch or a neighboring device. |
MAC | This field displays the MAC address of the IPv6 interface on which the IPv6 address is configured or the MAC address of the neighboring device. |
Status | This field displays whether the neighbor IPv6 interface is reachable. In IPv6, “reachable” means an IPv6 packet can be correctly forwarded to a neighbor node (host or router) and the neighbor can successfully receive and handle the packet. The available options in this field are: • Reachable (R): The interface of the neighboring device is reachable. (The Switch has received a response to the initial request.) • Stale (S): The last reachable time has expired and the Switch is waiting for a response to another initial request. The field displays this also when the Switch receives an unrequested response from the neighbor’s interface. • Delay (D): The neighboring interface is no longer known to be reachable, and traffic has been sent to the neighbor recently. The Switch delays sending request packets for a short to give upper-layer protocols a chance to determine reachability. • Probe (P): The Switch is sending request packets and waiting for the neighbor’s response. • Invalid (IV): The neighbor address is with an invalid IPv6 address. • Unknown (?): The status of the neighboring interface cannot be determined for some reason. • Incomplete (I): Address resolution is in progress and the link-layer address of the neighbor has not yet been determined. The interface of the neighboring device did not give a complete response. |
Type | This field displays the type of an address mapping to a neighbor interface. The available options in this field are: • Other (O): none of the following type. • Local (L): A Switch interface is using the address. • Dynamic (D): The IP address to MAC address can be successfully resolved using IPv6 Neighbor Discovery protocol. Is it similar as IPv4 ARP (Address Resolution protocol). • Static (S): The interface address is statically configured. |
Interface | This field displays the ID number of the IPv6 interface on which the IPv6 address is created or through which the neighboring device can be reached. |
Sorting by | Click one of the following buttons to display and arrange the data according to that button type. The result is then displayed in the summary table above. |
Address | Click this button to display and arrange the data according to IPv6 address. |
MAC | Click this button to display and arrange the data according to MAC address. |
Interface | Click this button to display and arrange the data according to IPv6 interface. |
MAC Table Overview
The MAC Table screen (a MAC table is also known as a filtering database) shows how frames are forwarded or filtered across the Switch’s ports. It shows what device MAC address, belonging to what VLAN group (if any) is forwarded to which ports and whether the MAC address is dynamic (learned by the Switch) or static (manually entered in the SWITCHING > Static MAC Forwarding > Static MAC Forwarding screen).
Viewing the MAC Table
Use this screen to search specific MAC addresses. You can also directly add dynamic MAC addresses into the static MAC forwarding table or MAC filtering table from the MAC table using this screen.
The following table describes the labels in this screen.
label | Description |
|---|---|
Condition | Select one of the below search conditions and click Search to only display the data which matches the criteria you specified. Select All to display any entry in the MAC table of the Switch. Select Static to display the MAC entries manually configured on the Switch. Select MAC and enter a MAC address in the field provided to display a specified MAC entry. Select VID and enter a VLAN ID in the field provided to display the MAC entries belonging to the specified VLAN. Select Port and enter a port number in the field provided to display the MAC addresses which are forwarded on the specified port. Select Trunk and type the ID of a trunk group to display all MAC addresses learned from the ports in the trunk group. |
Sort by | Define how the Switch displays and arranges the data in the summary table below. Select MAC to display and arrange the data according to MAC address. Select VID to display and arrange the data according to VLAN group. Select PORT to display and arrange the data according to port number. |
Type Transfer | Select Dynamic to MAC forwarding and click the Transfer button to change all dynamically learned MAC address entries in the summary table below into static entries. They also display in the SWITCHING > Static MAC Forwarding > Static MAC Forwarding screen. Select Dynamic to MAC filtering and click the Transfer button to change all dynamically learned MAC address entries in the summary table below into MAC filtering entries. These entries will then display only in the SWITCHING > Static MAC Filtering > Static MAC Filtering screen and the default filtering action is Discard source. |
Search | Click this to search data in the MAC table according to your input criteria. |
Transfer | Click this to perform the MAC address transferring you selected in the Type Transfer field. |
Cancel | Click Cancel to change the fields back to their last saved values. |
Index | This is the incoming frame index number. |
MAC Address | This is the MAC address of the device from which this incoming frame came. |
VID | This is the VLAN group to which this frame belongs. |
Port | This is the port where the above MAC address is forwarded. |
Type | This shows whether the MAC address is Dynamic (learned by the Switch) or Static (manually entered in the SWITCHING > Static MAC Forwarding > Static MAC Forwarding screen). |
Neighbor Overview
The Neighbor screen allows you to view a summary and manage the Switch’s neighboring devices. It uses Layer Link Discovery Protocol (LLDP) to discover all neighbor devices connected to the Switch including non-Zyxel devices. You can use this screen to perform tasks on the neighboring devices like login, power cycle (turn the power off and then back on again), and reset to factory default settings.
This screen shows the neighboring device first recognized on an Ethernet port of the Switch. Device information is displayed in gray when the neighboring device is offline.
Neighbor
The following table describes the fields in the above screen.
label | description |
|---|---|
Port | This shows the port of the Switch, on which the neighboring device is discovered. |
Port Name | This shows the port description of the Switch. |
Link | This shows the speed (either 10M for 10 Mbps, 100M for 100 Mbps, 1G for 1 Gbps, or 10G for 10 Gbps) and the duplex (F for full duplex or H for half). This field displays Down if the port is not connected to any device. |
PoE Draw (W) | For PoE models. This shows the consumption that the neighboring device connected to this port draws from the Switch. This allows you to plan and use within the power budget of the Switch. |
System Name | This shows the system name of the neighbor device. |
IPv4 | This shows the IPv4 address of the neighbor device. The IPv4 address is a hyper link that you can click to log into and manage the neighbor device through its Web Configurator. |
IPv6 | This shows the IPv6 address of the neighbor device. The IPv6 address is a hyper link that you can click to log into and manage the neighbor device through its Web Configurator. |
Action | For PoE models. Click the Reset button to turn OFF the power of the neighbor device and turn it back ON again. A count down button (from 5 to 0) starts.  The Switch must support power sourcing (PSE) or the network device is a powered device (PD).Click the Restore button to restore the neighboring device to its factory default settings. A warning message “Are you sure you want to load factory default?” appears prompting you to confirm the action. After confirming the action a count down button (from 5 to 0) starts. • The Switch must support power sourcing (PSE) or the network device is a powered device (PD). • If multiple neighbor devices use the same port, the Reset button is not available. • You can only reset Zyxel powered devices that support the ZON utility. |
Neighbor Details
Use this screen to view detailed information about the neighboring devices. Device information is displayed in gray when the neighboring device is currently offline.
Up to 10 neighboring device records per Ethernet port can be retained in this screen even when the devices are offline. When the maximum number of neighboring device records per Ethernet port is reached, new device records automatically overwrite existing offline device records, starting with the oldest existing offline device record first.
The following table describes the fields in the above screen.
label | description |
|---|---|
Search Ports... | Enter the port number to search and display the ports you specified. The result will display in the below list. You can enter multiple ports separated by comma (“,”) or hyphen (“-”) for a range. For example, enter “3-5” for ports 3, 4, and 5. Enter “3,5,7” for ports 3, 5, and 7. |
Port | This shows the port of the Switch, on which the neighboring device is discovered. |
Desc. | This shows the port description of the Switch. |
Link Speed | This shows the speed (either 10M for 10 Mbps, 100M for 100 Mbps, 1G for 1 Gbps, 2.5G for 2.5 Gbps, 5G for 5 Gbps, or 10G for 10 Gbps) and the duplex (F for full duplex or H for half). This field displays Down if the port is not connected to any device. |
PoE Draw | For PoE models. This shows the consumption that the neighboring device connected to this port draws from the Switch. This allows you to plan and use within the power budget of the Switch. |
Reset | Click this button to turn OFF the power of the neighbor device and turn it back ON again. A count down button (from 5 to 0) starts. The Switch must support power sourcing (PSE) or the network device is a powered device (PD). |
Remote | |
System Name | This shows the system name of the neighbor device. |
Port Bridge | This shows the neighboring device’s MAC address or the port number connected to the Switch. |
Model | This shows the model name of the neighbor device. This field will show “–” for devices that do not support the ZON utility. |
MAC | This shows the MAC address of the neighbor device. |
Firmware | This shows the firmware version of the neighbor device. This field will show “–” for devices that do not support the ZON utility. |
Location | This shows the geographic location of the neighbor device. This field will show “–” for devices that do not support the ZON utility. |
Desc. | This shows the description of the neighbor device’s port which is connected to the Switch. |
IPv4 | This shows the IPv4 address of the neighbor device. The IPv4 address is a hyper link that you can click to log into and manage the neighbor device through its Web Configurator. |
IPv6 | This shows the IPv6 address of the neighbor device. The IPv6 address is a hyper link that you can click to log into and manage the neighbor device through its Web Configurator. |
Restore | Click this button to restore the neighbor device to its factory default settings. A warning message “Are you sure you want to load factory default?” appears prompting you to confirm the action. After confirming the action a count down button (from 5 to 0) starts. • The Switch must support power sourcing (PSE) or the network device is a powered device (PD). • If multiple neighbor devices use the same port, the Reset button is not available. • You can only reset Zyxel powered devices that support the ZON utility. |
Flush | Click the Flush button on the port tab to remove information about neighbors learned on a specific ports. |
Flush All | Click the Flush All button to remove information about neighbors learned on all ports. |
Path MTU Overview
The largest size (in bytes) of a packet that can be transferred over a data link is called the Maximum Transmission Unit (MTU). The Switch uses Path MTU Discovery to discover Path MTU (PMTU), that is, the minimum link MTU of all the links in a path to the destination. If the Switch receives an ICMPv6 Packet Too Big error message after sending a packet, it fragments the next packet according to the suggested MTU in the error message.
Path MTU Table
Use this screen to view IPv6 path MTU information on the Switch.
The following table describes the labels in this screen.
label | Description |
|---|---|
Path MTU aging time | This field displays how long an entry remains in the Path MTU table before it ages out and needs to be relearned. |
Index | This field displays the index number of each entry in the table. |
Destination Address | This field displays the destination IPv6 address of each path or entry. |
MTU | This field displays the maximum transmission unit of the links in the path. |
Expire | This field displays how long (in minutes) an entry can still remain in the Path MTU table before it ages out and needs to be relearned. |
Port Status
This screen displays a port statistical summary with links to each port showing statistical details. To view the port statistics, click MONITOR > Port Status > Port Status to display the Port Status screen as shown next. You can also click the Port Status link in the Quick Link section of the DASHBOARD screen to see the following screen.
The following table describes the labels in this screen.
label | description |
|---|---|
Port | This identifies the Ethernet port. Click a port number to display the Port Details screen. |
Name | This is the name you assigned to this port in the PORT > Port Setup screen. |
Link | This field displays the speed (either 10M for 10 Mbps, 100M for 100 Mbps, or 1G for 1 Gbps) and the duplex (F for full duplex or H for half). It also shows the cable type (Copper or Fiber) for the combo ports. This field displays Down if the port is not connected to any device. |
State | If STP (Spanning Tree Protocol) is enabled, this field displays the STP state of the port. If STP is disabled, this field displays FORWARDING if the link is up, otherwise, it displays STOP. When LACP (Link Aggregation Control Protocol) and STP are in blocking state, it displays BLOCKING. |
PD | For PoE models only. This field displays whether or not a powered device (PD) is allowed to receive power from the Switch on this port. |
LACP | This fields displays whether LACP (Link Aggregation Control Protocol) has been enabled on the port. |
TxPkts | This field shows the number of transmitted frames on this port. |
RxPkts | This field shows the number of received frames on this port. |
Errors | This field shows the number of received errors on this port. |
Tx kB/s | This field shows the number of kilobytes per second transmitted on this port. |
Rx kB/s | This field shows the number of kilobytes per second received on this port. |
Up Time | This field shows the total amount of time in hours, minutes and seconds the port has been up. |
Clear the counter | Select Port, enter a port number and then click Clear Counter to erase the recorded statistical information for that port, or select ALL Ports to clear statistics for all ports. |
Port Details
Use this screen to check status and detailed performance data about an individual port on the Switch.
The following table describes the labels in this screen.
label | description |
|---|---|
Port Info | |
Port NO. | This field displays the port number you are viewing. |
Name | This field displays the name of the port. |
Link | This field displays the speed (either 10M for 10 Mbps, 100M for 100 Mbps, or 1G for 1 Gbps) and the duplex (F for full duplex or H for half duplex). It also shows the cable type (Copper or Fiber) for the combo ports. This field displays Down if the port is not connected to any device. |
State | If STP (Spanning Tree Protocol) is enabled, this field displays the STP state of the port. If STP is disabled, this field displays FORWARDING if the link is up, otherwise, it displays STOP. When LACP (Link Aggregation Control Protocol), STP, and dot1x are in blocking state, it displays BLOCKING. |
LACP | This field shows if LACP is enabled on this port or not. |
TxPkts | This field shows the number of transmitted frames on this port. |
RxPkts | This field shows the number of received frames on this port. |
Errors | This field shows the number of received errors on this port. |
Tx kB/s | This field shows the number of kilobytes per second transmitted on this port. |
Tx Utilization% | This field shows the percentage of actual transmitted frames on this port as a percentage of the Link speed. |
Rx kB/s | This field shows the number of kilobytes per second received on this port. |
Rx Utilization% | This field shows the percentage of actual received frames on this port as a percentage of the Link speed. |
Up Time | This field shows the total amount of time the connection has been up. |
TX Packet The following fields display detailed information about packets transmitted. | |
Unicast | This field shows the number of good unicast packets transmitted. |
Multicast | This field shows the number of good Multicast packets transmitted. |
Broadcast | This field shows the number of good broadcast packets transmitted. |
Pause | This field shows the number of 802.3x pause packets transmitted. |
RX Packet The following fields display detailed information about packets received. | |
Unicast | This field shows the number of good unicast packets received. |
Multicast | This field shows the number of good Multicast packets received. |
Broadcast | This field shows the number of good broadcast packets received. |
Pause | This field shows the number of 802.3x pause packets received. |
TX Collision The following fields display information on collisions while transmitting. | |
Single | This is a count of successfully transmitted packets for which transmission is inhibited by exactly one collision. |
Multiple | This is a count of successfully transmitted packets for which transmission was inhibited by more than one collision. |
Excessive | This is a count of packets for which transmission failed due to excessive collisions. Excessive collision is defined as the number of maximum collisions before the retransmission count is reset. |
Late | This is the number of times a late collision is detected, that is, after 512 bits of the packets have already been transmitted. |
Error Packet The following fields display detailed information about packets received that were in error. | |
RX CRC | This field shows the number of packets received with CRC (Cyclic Redundant Check) errors. |
Length | This field shows the number of packets received with a length that was out of range. |
Runt | This field shows the number of packets received that were too short (shorter than 64 octets), including the ones with CRC errors. |
Distribution | |
64 | This field shows the number of packets (including bad packets) received that were 64 octets in length. |
65 to 127 | This field shows the number of packets (including bad packets) received that were between 65 and 127 octets in length. |
128 to 255 | This field shows the number of packets (including bad packets) received that were between 128 and 255 octets in length. |
256 to 511 | This field shows the number of packets (including bad packets) received that were between 256 and 511 octets in length. |
512 to 1023 | This field shows the number of packets (including bad packets) received that were between 512 and 1023 octets in length. |
1024 to 1518 | This field shows the number of packets (including bad packets) received that were between 1024 and 1518 octets in length. |
Giant | This field shows the number of packets (including bad packets) received that were between 1519 octets and the maximum frame size. The maximum frame size varies depending on your switch model. |
DDMI
The optical SFP transceiver’s support for the Digital Diagnostics Monitoring Interface (DDMI) function lets you monitor the transceiver’s parameters to perform component monitoring, fault isolation and failure prediction tasks. This allows proactive, preventative network maintenance to help ensure service continuity.
Use this screen to view the DDMI status of the Switch’s SFP transceivers.
The following table describes the labels in this screen.
label | description |
|---|---|
Port | This identifies the SFP port. Click a port number to display the DDMI Details screen. |
Vendor | This displays the vendor name of the optical transceiver. |
Part Number | This displays the part number of the optical transceiver. |
Serial Number | This displays the serial number of the optical transceiver. |
Revision | This displays the revision number of the optical transceiver. |
Date Code | This displays the date when the optical transceiver was manufactured. |
Transceiver | This displays the type of optical transceiver installed in the SFP slot. |
DDMI Details
Use this screen to view the real-time SFP (Small Form Factor Pluggable) transceiver information and operating parameters on the SFP port. The parameters include, for example, transmitting and receiving power, and module temperature.
The following table describes the labels in this screen.
label | description |
|---|---|
Transceiver Information | |
Port No | This identifies the SFP port. |
Connector Type | This displays the connector type of the optical transceiver. |
Vendor | This displays the vendor name of the optical transceiver. |
Part Number | This displays the part number of the optical transceiver. |
Serial Number | This displays the serial number of the optical transceiver. |
Revision | This displays the revision number of the optical transceiver. |
Date Code | This displays the date when the optical transceiver was manufactured. |
Transceiver | This displays details about the type of transceiver installed in the SFP slot. |
Calibration | This field is available only when an SFP transceiver is inserted into the SFP slot. Internal displays if the measurement values are calibrated by the transceiver. External displays if the measurement values are raw data which the Switch calibrates. |
DDMI Information | |
Type | This displays the DDMI parameter. |
Temperature (C) | This displays the temperature inside the SFP transceiver in degrees Celsius. |
Voltage (V) | This displays the level of voltage being supplied to the SFP transceiver. |
TX Bias (mA) | This displays the milliamps (mA) being supplied to the SFP transceiver’s Laser Diode Transmitter. |
TX Power (dbm) | This displays the amount of power the SFP transceiver is transmitting. |
RX Power (dbm) | This displays the amount of power the SFP transceiver is receiving from the fiber cable. |
Current | This displays the current status for each monitored DDMI parameter. |
High Alarm Threshold | This displays the high value alarm threshold for each monitored DDMI parameter. An alarm signal is reported to the Switch if the monitored DDMI parameter reaches this value. |
High Warn Threshold | This displays the high value warning threshold for each monitored DDMI parameter. A warning signal is reported to the Switch if the monitored DDMI parameter reaches this value. |
Low Warn Threshold | This displays the low value warning threshold for each monitored DDMI parameter. A warning signal is reported to the Switch if the monitored DDMI parameter reaches this value. |
Low Alarm Threshold | This displays the low value alarm threshold for each monitored DDMI parameter. An alarm signal is reported to the Switch if the monitored DDMI parameter reaches this value. |
Port Utilization
This screen displays the percentage of actual transmitted or received frames on a port as a percentage of the Link speed.
The following table describes the labels in this screen.
label | description |
|---|---|
Port | This identifies the Ethernet port. |
Link | This field displays the speed (either 10M for 10 Mbps, 100M for 100 Mbps, or 1G for 1 Gbps) and the duplex (F for full duplex). It also shows the cable type (Copper or Fiber) for the combo ports. This field displays Down if the port is not connected to any device. |
Tx kB/s | This field shows the transmission speed of data sent on this port in kilobytes per second. |
Tx Utilization% | This field shows the percentage of actual transmitted frames on this port as a percentage of the Link speed. |
Rx kB/s | This field shows the transmission speed of data received on this port in kilobytes per second. |
Rx Utilization% | This field shows the percentage of actual received frames on this port as a percentage of the Link speed. |
System Information
Use this screen to view general system information.
The following table describes the labels in this screen.
label | description |
|---|---|
System Information | |
System Name | This displays the descriptive name of the Switch for identification purposes. |
Product Model | This displays the product model of the Switch. Use this information when searching for firmware upgrade or looking for other support information in the website. |
ZyNOS F/W Version | This displays the version number of the Switch 's current firmware including the date created. |
Ethernet Address | This refers to the Ethernet MAC (Media Access Control) address of the Switch. |
CPU Utilization Current (%) | This displays the current percentage of CPU utilization. |
Memory Utilization Memory utilization shows how much DRAM memory is available and in use. It also displays the current percentage of memory utilization. | |
Name | This displays the name of the memory pool. |
Total (byte) | This displays the total number of bytes in this memory pool. |
Used (byte) | This displays the number of bytes being used in this memory pool. |
Utilization (%) | This displays the percentage (%) of memory being used in this memory pool. |
Hardware Monitor | |
Temperature Unit | The Switch has temperature sensors that are capable of detecting and reporting if the temperature rises above the threshold. You may choose the temperature unit (Centigrade or Fahrenheit) in this field. |
Temperature (C/F) | BOARD / MAC and PHY/POWER refers to the location of the temperature sensor on the Switch printed circuit board. |
Status | This field displays Normal for temperatures below the threshold and Error for those above. |
Current | This shows the current temperature at this sensor. |
MAX | This field displays the maximum temperature measured at this sensor. |
MIN | This field displays the minimum temperature measured at this sensor. |
Threshold | This field displays the upper temperature limit at this sensor. |
Fan Speed (RPM) | A properly functioning fan is an essential component (along with a sufficiently ventilated, cool operating environment) in order for the device to stay within the temperature threshold. Each fan has a sensor that is capable of detecting and reporting if the fan speed falls below the threshold shown. |
Status | Normal indicates that this fan is functioning above the minimum speed. Error indicates that this fan is functioning below the minimum speed. |
Current | This field displays this fan's current speed in Revolutions Per Minute (RPM). |
MAX | This field displays this fan's maximum speed measured in Revolutions Per Minute (RPM). |
MIN | This field displays this fan's minimum speed measured in Revolutions Per Minute (RPM). "<41" is displayed for speeds too small to measure (under 2000 RPM). |
Threshold | This field displays the minimum speed at which a normal fan should work. |
Voltage(V) | The power supply for each voltage has a sensor that is capable of detecting and reporting if the voltage falls out of the tolerance range. |
Status | Normal indicates that the voltage is within an acceptable operating range at this point; otherwise Error is displayed. |
Current | This is the current voltage reading. |
MAX | This field displays the maximum voltage measured at this point. |
MIN | This field displays the minimum voltage measured at this point. |
Threshold | This field displays the percentage tolerance of the voltage with which the Switch still works. |
System Log
Use this screen to check current system logs.
When a log reaches the maximum number of log messages, new log messages automatically overwrite existing log messages, starting with the oldest existing log message first.The summary table shows the time the log message was recorded and the reason the log message was generated. Click Refresh to update this screen. Click Clear to clear the whole log, regardless of what is currently displayed on the screen. Click Download to save the log to your computer.