Westermo RedFox Series - Manual (Page 176)

Westermo OS Management Guide
Version 4.17.0-0
❼ If a port is associated ”untagged” with a VLAN, that VID will be the port’s
default VID. E.g., if a port is associated ”untagged” to VID 10, the port will
have VID 10 as its ”default VID”.
❼ If a port is not associated ”untagged” with any VLAN, the port’s default VID
is determined as:
– the port’s fallback default VID, given that a fallback default-VID is con-
figured, or
– the default VLAN (VID 1), if no fallback default-VID is configured
The fallback default VID can be used to control whether ”untagged” packets
should be accepted on a port (only) associated ”tagged” with a set of VLANs.
If the port’s default VID is represented within that set of VLANs, the packet will
be accepted. Otherwise it will be dropped.
8.1.11 SFP DDM/DOM Diagnostics
Digital diagnostics monitoring (DDM), also known as digital optics monitoring
(DOM), is a function enabling the user to monitor diagnostic parameters of the
SFP.
WeOS provides diagnostic information for the following DDM parameters.
❼ Optical TX power
Measures the optic power when transmitting, which can be used for detect-
ing a deteriorating link
3 . The accuracy is better than +/-3dB and the total
range of -40 to +8.2 dBm (0–6.5535 mW).
❼ Optical RX power
Measures the optic power when receiving, which can be used for detecting
a deteriorating link. The accuracy is better than +/-3dB and the total range
of -40 to +8.2 dBm (0–6.5535 mW).
❼ Temperature
The temperature of the SFP should be very close or equal to the temperature
of the unit. The temperature accuracy is better than 3 degrees Celsius (➦C)
and the total range of -128 ➦C to +128 ➦C.
3 By comparing the TxPower on a unit with the RxPower on the unit it is connected to, the user
can find out the amount of "signal strength" that is lost over the optic link. When the gap between
TxPower and RxPower is increasing, the optic link’s capability to transfer the signal decreases.
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