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If the loop needs to be removed, click on Cancel. During this time, it will not be possible to apply any other loops at either end of the service. When there is an active loopback applied, a message will be displayed with details about the Loopback.
Loopback test full#
WARNING Layer 2 – Full Service Loopbacks is disruptive to your service and will cause loss of traffic Once complete, click on the Execute Loopback button. The loop duration can be entered manually in minutes. When there is no active loopback applied to the service, a message will state that there is no loopback detected.Ĭlick Continue to confirm that you wish to proceed:Įnter the Loop duration and source/destination MAC/IP address. Select which end the loopback should be applied, followed by the loop configuration type (Layer 2-Full, Layer 2 or Layer 3 loopback): Select the service and click on View and Apply under the Loopback icon: **Layer 3 - Destination of Source IP Address Using the Loopback feature
Loopback test mac#
*Layer 2 - Destination of Source MAC Address However all loopbacks will be automatically cleared after 24 hours. Please be aware that all loopbacks can be set for a defined duration. In addition any TCP/UDP port addresses are also swapped. Note: When Layer 3 loops are invoked, the IP source and destination addresses within the packet are swapped. Note: Layer 3 address swapping is disabled when Layer 2 loops are invoked. Note: This functionality is only available on those NIDs that do not support customised Layer 2 loopbacks. Specifying a source or destination IP address ensures that other traffic will pass uninhibited. Specifying a source or destination MAC address ensures that other traffic will pass uninhibited. This capability has the potential of looping ALL traffic at the given NID and must be executed with caution. Layer 3 IP frames with a designated source or destination IP address are looped at the service end point. Layer 2 Ethernet frames with a designated source or destination MAC address are looped at the service end point. Layer 3 - Destination or Source IP AddressĪll layer 2 Ethernet frames are looped at the designated service end point with destination and source MAC addresses being swapped in the header. Layer 2 - Destination or Source MAC Address The following loopback configurations are possible based on the specific service and associated NID selected.* Layer 2 - Full Service The loopback can be customised depending on the functionality supported by the selected NID and can be applied at Layer 2 or LAyer 3, enabling full end to end tests to be carried out when a test is applied at either end These adapters must be configured for RS-422 or 4-wire RS-485 in order to perform a loopback test.How to use the Service Test Portal – Loopback?īy Clicking on the View and Apply button of the Loopback function, this provides the ability to apply “soft” loopbacks on the Colt Network Interface Devices (NID) at either end of the services Note: Some single-port 2-wire RS-485 adapters do not support “Echo”. No external loopback adapter is required. This allows you to perform an internal loopback test.
Loopback test serial#
On single port serial adapters configured for 2-wire RS-485, enable “Echo” to allow the receiver to listen during transmission. Visually verify that the data received is the same as the data transmitted. To complete the loopback test, set the first instance of WinSSD to the first port to receive and the second instance of WinSSD to the second port to transmit. Visually verify that the data transmitted is the same as the data received. Set the first instance of WinSSD to the first port to transmit and the second instance of WinSSD to the second port to receive. Open two instances of WinSSD by running it twice. To successfully perform a loop back test with 2-wire RS-485, the easiest method is to connect two adjacent serial ports together and use the BERT function in the Sealevel WinSSD utility.
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For this reason an external loopback adapter will not work with 2-wire RS-485.
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Therefore, when the serial port is transmitting data, the receiver is disabled. Many applications are not designed to receive the same data they are transmitting and expect the serial port to be set to “No Echo”. 2-wire RS-485 connects the transmitter and receiver to the same data channel.