20G-2X.8C.0.G

SNMPv3 (read and write)
Username:"master"
Authentication algorithm: SHA1
Authentication password:"mastermaster"
Private algorithm: AES128
Private password:"mastermaster"

SNMPv3 (read only)
Username:"user"
Authentication algorithm: SHA1
Authentication password:"useruser"
Private algorithm: AES128
Private password:"useruser"

SNMPv2c (read and write)
Community:"write"

SNMPv2c (read only)
Community:"read"

SSH (ethernet)
User:"metel"
Password:"metel"

SSH (USB)
Service:"metel"
User:"metel"
Password:"metel"

Yes. A USB factory reset will restore the device to factory settings.

Default parameters
IP address - printed on the switch label
Mask - 255.0.0.0
Gateway - 10.1.0.1

YES, the configuration should be preserved even after a system upgrade, but it is always a good idea to backup the current configuration beforehand. I recommend making a complete backup to avoid any problems that may occur during the upgrade.

The mechanical and electrical parameters of SFP modules and slots are defined in the MSA (multi-source agreement). This ensures mutual compatibility between SFP module manufacturers and SFP slots of network elements. The SFP module includes an EEPROM. It stores information about the module type, supported speed, optical interface type, etc. The most widely used standards in IT are 100BASE-LX and 1000BASE-LX standards (LC connectors) with 2-fiber communication. This has probably also led to the fact that some commercial switches do not support the more modern single-fiber 100BASE-BX and 1000BASE-BX standards. Specifically, this refers to Byte 6 in the EEPROM (Ethernet Compliance Codes). For the above reasons, all BX-1000-...SFP modules have bit 1 (1000BASE-LX) set in Byte 6 and BX-1000-...SFP modules have bit 4 (100BASE-LX) set in Byte 6. The modules are then easily detected even by a switch that does not implement 100/1000BASE-BX support.

For modules with bidirectionaldata transmission over a singlefiber (wave multiplex), it is necessary to connect the optical modules correctlyto each other. Thismeans that, for example, inMETELWDM modules,the modulemarkedW4can only be interconnected with the modulemarkedW5. It is not possible to connect W4 with W4 or W5 with W5.

BX-100(0)-20-Wx-L
WavelengthsW4: TX:1310 / RX:1550 nm
WavelengthsW5: TX:1550 / RX:1310 nm

BX-10G-20-Wx
WavelengthsW4: TX:1270 / RX:1330 nm
Wavelengths W5: TX:1330 / RX:1270 nm

YES, ifyouare using the LAN-RING protocol. In terms of the LAN-RING protocol, the port with thelowerindex is thetransmitportand the port with thehigherindex is thereceiveport.Therefore,the rulemustbefollowedthat the optics will be connected from thelowerindex portto thehigherindex port.Therefore,inallswitchesin a ring,SFP modulesmustbeinserted in thesameway, e.g., an SFP with theW4 tag at the endwill be inserted into slot G1and anSFP with theW5 tag will be inserted into slot G2.

NO, ifyoudisable the LAN-RING protocol oruse the RSTP protocol. Inthiscase,it does not matter how the SFPs are inserted.

SNMPv3-enabled switches have SHA1 and AES128 methods enabled by default. You can change to SHA512 and AES256c in the configuration.

The recommended line load is 75% of the total data throughput.

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Yes, of course, this option is available for the LAN-RING system. Only in this case, we recommend disabling the ringing function in the switch configuration (None) or switching LAN-RING to Rapid Spanning Tree Protocol (RSTP-M).

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If the distance between the camera and the switch is longer than 100 m, we use a LAN-EXT solution. This is a device that can repeat the route of the link, even several times in a row.

LAN extenders

I have observed different RSTP behavior of your switch compared to a competing switch in the following situation. There are two switches in the network connected to each other by a fiber optic link. Egress filtering is enabled on one of these devices (Egress filtering: No unknown destination address). However, only one switch is available at this time because the link is blocked by the RSTP protocol. However, if I replace the unavailable switch with a competing device with a similar configuration, both switches are available.

Egress filtering causes BPDU frames to be sent only in one direction because the other direction is filtered. This causes the first switch to know about the second, but the second switch does not know about the first. This condition is handled by the so-called "contention mechanism". This was incorporated into the 802.1D-2004 standard and solves the problem you mentioned by blocking the link to prevent loops. Our implementation of the RSTP protocol complies with this standard. Other vendors may have a different implementation of the RSTP protocol based on an older standard that did not include a "dispute mechanism".