70
2.048Mbps Wireless Modem
SALES: 0118 965 5100
System Counters
In the Counters and Tracers menu, type 1 to display the System Counters.
Figure 3-7.2.048Mbps Wireless Modems Counter display.
The System Counters give you statistical information on the quality of communications with
the terminal equipment (LIU side) and with the other end of the wireless link (Radio side).
The data stream received/transmitted from/to the 2.048Mbps Wireless Modems is divided
internally in the 2.048Mbps Wireless Modem into buffers, and the statistics are based on
these buffers. The data is accumulated continuously until the System Counters are cleared.
Thus, the numbers represent the accumulated results since the last time the counters were
Cleared. The 2.048Mbps Wireless Modem uses an Automatic Retransmission Queuing
(ARQ) mechanism that enables to detect errors in the received data and to request
retransmission of that data. The ARQ mechanism breaks the data into fragments (called
buffer
s) and adds a Cyclical Redundancy Check (CRC) code which enables detection of
errors in the received fragment. A header providing unique identification as well as
Acknowledge/Not Acknowledge response is attached to each fragment.
Figure 3-8 displays the 2.048Mbps Wireless Modem system counters flow:
Figure 3-8. 2.048Mbps Wireless Modem System Counters flow
LIU TX BUFFERS
0
LIU RX BUFFERS#
0
LIU ERROR BUFFERS
0
LIU BUFFER ERROR RATE
0.00e+00
RADIO NOT ACK BUFFERS
0
RADIO TX BUFFERS
70321
RADIO RX BUFFERS
0
RADIO ERROR BUFFERS
0
RADIO NO RX BUFFERS
0
RADIO BUFFER ERROR
0.00e+00
Rate
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