Harmony House 802.11a - Manual (Page 53)

Harmony Utility 53
• Last ACK RSSI: This statistic reports the RSSI (Received Signal Strength) for the
last acknowledgment (ACK) received by the adapter. RSSI is reported in decibels
(dB) and typically ranges from 0 to 75. In general, an RSSI less than 15 indicates a
weak signal and an RSSI greater than 30 indicates a strong signal.
• ACK Errors: This statistic reports the number of unicast transmit attempts for
which no acknowledgement (ACK) was received.
• CTS Errors: This statistic reports the number of Clear To Send (CTS) errors. When
the adapter uses RTS/CTS before transmitting a packet, it first sends a Request to
Send (RTS) message to the packet’s recipient. The packet’s recipient then returns
a CTS message to the adapter. When the adapter receives the CTS, it sends the
packet to the recipient. However, if the adapter does not receive a CTS within a
fixed period of time, it will resend the RTS. After a fixed number of retries, the
adapter will record a CTS Error if a CTS has not been received.
• Antenna A Success: The adapter provides antenna diversity. This means that it
automatically switches between its two antennas (referred to as Antenna A and
Antenna B) to provide the strongest possible signal to a receiving radio. This sta-
tistic reports the number of packets successfully transmitted using Antenna A.
• Antenna B Success: This statistic reports the number of packets successfully
transmitted using Antenna B.
Receive
•
Receive Rate: This field reports the data rate at which the adapter is currently
receiving packets sent by another 802.11a device.
• Unicast Bytes Received: This statistic reports the total number of bytes contained
in the unicast packets received by the adapter.
• Multicast Bytes Received: This statistic reports the total number of bytes con-
tained in the multicast packets received by the adapter.
• WEP Undecryptable: This statistic displays the number of packets that were dis-
carded due to a problem during decryption, such as mismatched WEP Keys.
• Bad Frame Checksum: This statistic displays the number of received packets that
failed the CRC (Cyclic Redundancy Check) of the Frame Check Sequence (FCS).
• Last Frame’s RSSI: This statistic reports the RSSI (Received Signal Strength) for
the last packet received by the adapter. RSSI is reported in decibels (dB) and typ-
ically ranges from 0 to 75. In general, an RSSI less than 15 indicates a weak signal
and an RSSI greater than 30 indicates a strong signal.
• Duplicate Frames: This statistic displays the number of duplicate packets
received by the adapter. When the adapter successfully receives a packet, it
sends an acknowledgment (ACK) to the transmitting node. If the ACK does not
reach the transmitting node within a specified period of time after it sent the
packet (due to interference or some other type of delay), it will resend the packet
to the recipient. In this case, the adapter then receives the packet a second time,
records that it received a duplicate packet, and sends an ACK again.