Motorola PTP 400 Series - Manual (Page 79)

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Target Receive Modulation Mode: This is the maximum mode the unit will use as its
adaptive modulation. The modulation modes available are:
• BPSK 1 / 2
• QPSK 1 / 2
• QPSK 2 / 3
• 16QAM 1 / 2
• 16QAM 3 / 4
• 64QAM 2 / 3
• 64QAM 3 / 4
• 64QAM 7 / 8
By default the Target Receive Modulation Mode is 64QAM 7/8. The value in brackets shows
the maximum unidirectional data for the current modulation / ranging mode combination.
Maximum Transmit Power: This specifies the maximum transmit power in dBm of the
system, it is country dependent and although the user can change this it will be limited to that
country’s regulations.
Ethernet Compression: When Ethernet compression is enabled all compressible Ethernet
packets are transmitted over the wireless link using a compressed data format. This will have
the net effect of increasing wireless link traffic throughput. Because the compression
techniques used in the PTP 400 Series Bridge are CPU intensive, compression is only
applied to modulation modes BPSK 1/2, QPSK 1/2 and QPSK 2/3. The net effect of
compression is solely dependant on the individual packet compressibility (entropy). Random
data will not produce good packet compression; however ASCII text and other non-random
data sources will produce an acceptable level of compressibility.
All the above attributes are non-volatile. Once set they will be used by the unit even after a
power-on reboot. A number of attributes, such as IP Address, Subnet Mask and Gateway IP
Address will require a reboot before they are used. If any of these attributes are changed a
reboot screen appears asking the user to verify the reboot. (See Figure 30)
Figure 30 - Configuration Reboot Page