User's Manual

13
The RF Port (navigate to the details button on the Main Status screen next to
each client’s description) also has its own detailed screen:
Key fields for this screen include:
Master / Slave MAC: The RF port MAC address of the Master and Slave unit.
Link State: Green if a link is established and Red if not.
Local RSSI: Receive Signal Strength, in dBm, as measured by unit currently
being accessed. Please refer to Solectek’s Link Calculator Tool (P/N 1540901)
to establish a target RSSI for specific link distances and reliability requirements.
Total Frames: Total number of aggregated RF data frames received and sent
by the unit. Note: this number should not be expected to match the Ethernet
frames count. Packet framing, aggregation and QoS operations will all affect
the manner in which data is transported from Ethernet to RF port.
Data Packets: Total number of data packets prior to aggregation, on the
transmit side, and following de-aggregation, on the receive side.
Throughput: Displays the instantaneous, RF traffic rate, in Mbps. Due to
framing overhead, actual IP throughput will be less.
Receive Errors: Total number of errored frames received by the local unit.
Tip: When diagnosing link problems, it’s useful to clear the RF statistics and
allow 5-20 minutes of new data to accumulate. This will provide an accurate
picture of the current link conditions. On occasion, it may be useful to sample a
longer time period, up to 24 hours in some cases, as the influence of external
interference sources can vary across time due to usage patterns.
Note: RF Frames which are significantly damaged can not be accurately
attributed to a paired radio and will not affect this count.
Transmit Errors: Total number of frames transmitted by the local radio that
were not successfully acknowledged by the remote radio.
Errors of this type can be attributed to two causes: (a) Data packet not
received by remote radio, or (b) Acknowledgement packet from remote radio
not received by local radio.
Tip: Because the SkyWay Excel radio is a TDD system and uses the same
frequency for both transmit and receive, it is often instructive to compare RX
and TX error counts on both sides of the link so that RF impairments can be
isolated to the appropriate link direction and radio.
For example, if Radio A has a large number of TX errors and Radio B has a
large number of RX errors, one could conclude that the RF link from A => B
was impaired. Sources of potential interference at Radio B could then been
investigated.