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6.3
Frame Generator Mode
In this case, the device works as a Frame Generator, sending Ethernet frames on GB1 with
Gigabit Speed and on all 4 BroadR-Reach ports with 100Mbit/s.
In order to select this mode, the DIP s
witches 3 and 4 must be ON (“11” Value). In addition,
the user can select different functionalities according with the set of DIP switches 5,6,7 and
8:
•
DIP Switch 5: When it is ON, it selects the Burst Mode. In this mode, the device
sends 4 packets with the minimum IFG (Interframe Gap). These sequence of packets
consists on a burst of mixed packets -a large frame and three small frames.
•
DIP Switch 6: This switch selects the Packets Size. When it is OFF, the size of the
frame will be 64 bytes, and when it is ON, the size will be 1500 bytes
. The sizes don’t
include the preamble and CRC.
•
DIP Switches 7 and 8: This switches allows to select the FrameRate:
o
DIP Switch 7 OFF, DIP Switch 8 OFF (“00”): 5 Mbits/s
o
DIP Switch 7 OFF, DIP Switch 8 ON (“01”): 50 Mbits/s
o
DIP Switch 7 ON, DIP Switch 8 OFF (“10”): 90 Mbits/s
o
DIP Switch 7 ON, DIP Switch 8 ON (“11”): 98 Mbits/s
These rates are used in all BroadR-Reach ports, and in GB2. In Frame Generator mode, this
port will work as Fast Ethernet port, sending status frames -see section 6.3.2.
In GB1, these values are multiplied by 10.
6.3.1 Frame Format
The following image shows the Frame Format transmitted on all BroadR-Reach ports and
GB port in Frame Generator Mode.
Summary of Contents for BR SPY mini
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