User guide

45 Mbps Backhaul User Guide
Issue 3, December 2004 Page 34 of 113
Half Duplex Half Duplex data transmission means that data can be transmitted in both directions on a signal
carrier, but not at the same time. For example, on a local area network using a technology that has half duplex
transmission, one workstation can send data on the line and then immediately receive data on the line from the
same direction in which data was just transmitted.
MAC Address The Medium Access Control Layer (MAC) address is used to uniquely identify the equipment on
an Ethernet network.
IP Address Internet Protocol (IP) address. This address is used by the family of Internet protocols to uniquely
this identify the unit on a network
Subnet Mask A subnet allows the flow of network traffic between hosts to be segregated based on a network
configuration. By organizing hosts into logical groups, subnetting can improve network security and
performance.
Gateway IP Address The IP address of a computer on the current network that acts as a gateway. A gateway
acts as an entrance / exit to packets from / to other networks.
Wireless Link Status As the attribute name suggests displays the current status of the 45 Mbps Backhaul
wireless link. A state of ‘Up’ on a green background indicates that a Point-to-Point link is established. A state of
‘Down’ on a red background indicates that the wireless link is not established. If the link is down for an
unknown reason the system administrator should first consult the status webpage for a more detailed summary
of the prevailing system diagnostics.
Target Receive Modulation Mode The target modulation mode is used by the wireless subsystem to control the
adaptive modulation algorithm. The mode is used by the 45 Mbps Backhaul as an upper limit, the system will
not move to a high rate modulation mode even if the signal / interference environment will support high rate
modes.
Remote Transmit Maximum Power The maximum transmit power the remote wireless unit is permitted to use
to sustain a link.
Transmit Power Transmit power histogram is expressed in dBm and presented as: max, mean, min, and latest.
The histogram is calculated over a one hour period. If the equipment has been running for less than one hour
then the histogram is calculated over the current elapsed time.
The data used to compute the histogram statistics can be downloaded in an ASCII command separated variable
(CSV) format via the diagnostics download page, see section 6.3.9.
Receive Power Receive power histogram is expressed in dBm and presented as: max, mean, min, and latest. The
histogram is calculated over a one hour period. If the equipment has been running for less than one hour then
the histogram is calculated over the current elapsed time.
The data used to compute the histogram statistics can be downloaded in an ASCII command separated variable
(CSV) format via the download diagnostics page, see section 6.3.9.
Vector Error The vector error measurement compares the received signal’s In phase / Quadrature (IQ)
modulation characteristics to an ideal signal to determine the composite error vector magnitude. The results are
stored in a histogram and expressed in dB and presented as: max, mean, min and latest. The histogram is
calculated over a one hour period. If the equipment has been running for less than one hour then the histogram
is calculated over the current elapsed time. The expected range for Vector Error would be approximately 0dB
(NLOS link operating at sensitivity limit on BPSK _) to –29dB (short LOS link running 64QAM 7/8).
The data used to compute the histogram statistics can be downloaded in an ASCII command separated variable
(CSV) format via the download diagnostics page, see section 6.3.9.
Link Loss The link loss is the total attenuation of the wireless signal between the two Point-to-Point units.
The data used to compute the histogram statistics can be downloaded in an ASCII command separated variable
(CSV) format via the download diagnostics page, see section 6.3.9. The link loss calculation presented below: