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1. General description Ethernet/Gigabit Ethernet loopback device Bercut-ETL is intended for loopback performing at the physical, data link, network and transport layers of the OSI model in IP/Ethernet networks. Incoming traffic is being retransmitted backward with possibility of source and destination MAC/IP addresses and TCP/UDP port numbers swapping.
3. Overview Appearance Figure 3.1. Appearance of Bercut-ETL LEDs LEDs are located on the front panel of Bercut-ETL. They show loopback layer, Ethernet links and power supply unit connection state. Loopback layer indicators • 1 — layer 1 loopback; Bercut-ETL. Operating manual...
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• green — power supply unit is plugged in; • red — device malfunction. — the button for loopback mode control. To switch between layers 1, 2, 3, 4 or turn loopback off, press this button as many time as needed. Bercut-ETL. Operating manual...
Ethernet cable the tested network or equipment SFP-module connector SFP-module External power unit connector Power supply unit Port A contains 2 connectors — RJ-45 and SFP. During the test only one connector of the port is used. Bercut-ETL. Operating manual...
2. The device is ready to work after all LEDs flash once for 1 second and LINK indicator color has changed to green. 3. To perform analysis connect Bercut-ETL to the tested network. 4. To turn the device off disconnect the power supply unit.
4. Loopback Bercut-ETL is intended for loopback performing. Incoming traffic is be- ing retransmitted backward with possibility of source and destination MAC/IP addresses and TCP/UDP port numbers swapping. Network testing with the Loopback function can be performed at the four OSI layers, jumbo frames are supported (up to 9600 byte).
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Note: the frame will be retransmitted only if a frames destination MAC address is equal to the MAC address of Bercut-ETL. Figure 4.3. Loopback at the network layer • At the Transport layer (L4) the incoming traffic (without error pack-...
Figure 4.4. Loopback at the transport layer Loopback adjustment Connect Bercut-ETL to the Ethernet network and select Loopback layer by pressing L button. Additional parameters (IP address, MAC address, etc.) are being adjusted in the remote management mode (see section 5).
5.1 and 5.2, it is possible to configure device and view current settings. To manage Bercut-ETL over Telnet protocol connect to the device through the Ethernet interface or directly. Default IP address of the loopback device is 192.168.1.1.
The traffic (without error frames) is being retransmitted backward without swapping destination and source MAC addresses Possible OAM states are described below. • Passive — passive mode. In passive mode, Bercut-ETL can only re- sponse to Ethernet OAM commands from the remote device, but cannot initiate the Loopback mode.
Figure 5.1. Connection diagram In accordance with connection diagram it is possible to switch loopback mode on for several devices Bercut-ETL in series. The devices may be in the same or in the different subnets. the loopback mode on the Bercut-ETL devices may be Note: switched off...
Remote management Upgrading software versions The last versions of the software for the Bercut-ETL are accessible on the Internet: http://www.metrotek.spb.ru/files/b3etl/release Note: it is necessary to connect the device to the power unit before upgrading versions of the software. 5.4.1 Device preparing for upgrading software versions To upgrade software versions TFTP protocol is used.
Note: instead of etl X.X.X.bin inscription it is necessary to enter corresponding file name. Figure 5.3. Upgrading software versions (Unix) When you perform device software upgrading in Windows operating sys- tem enter in console terminal: Bercut-ETL. Operating manual...
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Figure 5.4. Upgrading software versions (Windows) After a short while a message about command performance will appear in console terminal. When the software package file is uploaded Bercut-ETL will automatically reboot. Notes • If current and new versions of the software are very much dif- ferent, settings are restored to default.
Use only one of the device (RJ-45 and SFP) at the connectors same time No telnet connection Loopback mode is on Switch off Loopback mode by means of OAM proto- col, ET discovery function or by pressing L button Bercut-ETL. Operating manual...
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