Whether the spacing specifications for adjacent channels refer to the specifications on fibers or in vacuum

For 10G, 40G, and 100G signals, the channel spacing is 50 GHz for an 80-wavelength system and 100 GHz for a 40-wavelength system. For 200G signals, the flexible grid technology can be used. When the technology is used, wavelength bandwidth is variable. For example, if different modulation methods are used for 200G signals, the required bandwidth is different. For example, it can be 75 GHz or 150 GHz.Flexible ROADM adjusts bandwidth based on signals and grooms the signals to specified directions according to the network configurations.

For 10G, 40G, and 100G line rates, the channel spacing is 50 GHz for an 80-wavelength system and is 100 GHz for a 40-wavelength system. For 200G signals, the flexible grid technology can be used. When the technology is used, the channel spacing is not fixed and can be set. For example, the channel spacing of 200G signals can be set to 37.5 GHz.

For the M40 board, the adjacent channel isolation should be greater than 22 dB.

For the D40 board, the adjacent channel isolation should be greater than 25 dB.

When a WLAN device becomes faulty or works abnormally because the environment does not meet operation requirements, the system generates alarms based on fault types and relevant logs. WLAN product documentation describes alarm description, alarm attributes, alarm parameters, impact on the system, possible causes, and solutions of each feature on a WLAN device. The following tips will help you quickly find reference information about a specific alarm: - An alarm ID uniquely identifies an alarm and allows you to search an alarm by alarm ID for its description and handling procedure. - Alarms that have the same ID but are triggered by different causes are identified by error code (for example, BaseTrapProbableCause). You can search for error codes in the Alarm Reference. - Do not search an alarm based on information carrying a variable, such as the alarm generation time, port number, process ID, or device name. To query a WLAN alarm, perform the following operations: - Query by keyword Log in to and enter a keyword, such as "AP online alarm". You can also obtain the required product documentation and query related alarms. - Query in the product documentation 1. Log in to . 2. Choose Enterprise Network > WLAN. 3. Select a WLAN device model. On the page that is displayed, select the product documentation of the specific version. 4. Query alarms online or download the product documentation for alarm query.