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This follows the Active DWDM Mux Demux Quick Start Guide V1.0 for FMU-AD402160M3. Its browser instructions use 192.168.126.1, and the guide allows changing that address. Confirm the exact model and current management address.

Open this local interface

Using the existing authorized management connection, enter the current address with the browser protocol and port confirmed by the operator. The guide’s numeric browser instruction does not specify a scheme.

Use the current management account. The guide gives root/public as initial credentials and separately documents account changes; do not assume the initial pair still applies.

Read State Statistics

After login, read State Statistics beneath the device drawing on the monitoring interface. Note the Totals and Details shown for Normal, Alarm and No Signal so the operator can identify which channels need attention.

Keep monitoring read-only

Record the displayed states without changing channel thresholds, IP configuration or credentials. The manual’s screenshot values and alternate screenshot address are examples, not observations of your installed unit.

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Sources & further reading
FS — Active DWDM Mux Demux Quick Start Guide V1.0