Resolution can be done by comparing the length of ping on Local and Remote. Pinging the unit behind
the radio channel is slower. The difference is more pronounced in the case of a long packet and the
low speed of the radio channel.
•
Access security
For better protection against unauthorised access to configuration you should only allow as few kinds
of access as possible. The most secure type is SSH with key – leave only SSH active with "only key"
choice.
•
Problem with HTTPS certificate
First login into the unit management typically requires to accept web browser warning about self-
signed HTTPS certificate. The issue may occur if a list of trusted HTTPS certificates stored by your
web browser already contains a record for a network element with identical IP address or network
name as the current unit management interface. In this case, the trusted HTTPS certificates for the
particular network element in your web browser needs to be manually erased. After that self-signed
certificate of the unit can be accepted.
Fast workaround: Try to use a different web browser or use HTTP connection instead (should be no
issue in private network).
•
Overexcited receiver
A natural property of each radio receiver is to compress the signal in one of the functional blocks,
when the signal level gets out of the AGC (automatic gain control) dynamic range. The result of this
effect is non-linear distortion of the received signal which is observed as decrease in the signal to
noise ratio, i.e. in case of digital modulations increase of the Mean Square Error (MSE).
Limit for guaranteed functionality of RAy3 radio receiver is -15 dBm (measured on the waveguide
input). This limit applies for all channel bandwidths and all modulations.
Beyond this limit the distortion of linearity appears and signal quality is depreciated. In extreme cases,
this can lead to the disintegration of the radio link due to reduced signal to noise ratio (as a result of
signal distortion).
•
ACM or ACMB does not respect parameter 'ACM/ACMB min TX modulation'
This parameter requires an identical value on both sides of the link. On the established link this is
ensured by FW, but for not linked (standalone) units such an equation has to be set manually before
linking, otherwise the link may be not established or if established, the value set at parameters
'ACM/ACMB min TX modulation' is not respected.
The solution is to manually reconfigure parameter 'ACM/ACMB min TX modulation' at least on one
end of a link to the value identical with the other end.
•
Setting up a link between RAy3-24S and other hardware variant of RAy3-24
Sometime it is necessary to set up a link from a legacy unit RAy3-24S and some newly deployed
hardware variant of RAy3-24 unit (like RAy3-24X) - for example after exchange of failed unit on one
end of the link (for an explanation of hardware variants '24S', '24X', '24E' and other see
Then it is necessary to configure newly deployed unit to behave like unit variant 'S' (legacy model).
To achieve that the parameter 'Unit 24S compatibility' (in menu
Tools > Maintenance > Radio adapt-
) has to be set to 'active'.
187
© RACOM s.r.o. – RAy3 Microwave Link
Troubleshooting
Содержание RAy3-11
Страница 2: ......
