Motorola PTP 600 Series User Manual page 162

Frequency Band: Only displayed for the PTP 25600 product variant, which operates in one
of three bands as described in Section 5.4 "Variable Channel Bandwidth Operation":
x
Lower: 2496 MHz to 2568 MHz
x
Middle: 2572 MHz to 2614 MHz
x
Upper: 2624 MHz to 2690 MHz
Channel Bandwidth: Users can choose a variable channel bandwidth for the available
spectrum. The selection depends upon the PTP bridge variant:
x
For PTP 25600, PTP 45600, PTP 54600, PTP 58600 and PTP 59600, Channel
Bandwidth may be 30, 15, 10 or 5 MHz.
x
For PTP 48600 and PTP 49600, Channel Bandwidth may be 20, 10 or 5 MHz.
Link Symmetry: (Master only) Values of Adaptive, 2:1, 1:1 and 1:2 can be selected. In fixed
symmetric mode, the master spends an equal amount of time transmitting and receiving
whereas in fixed asymmetric mode, the master transmit and receive times have a fixed ratio.
NOTE: (a) "Adaptive" is not supported in regions where radar avoidance is in use, (b)
"Adaptive" is not supported when link optimization is set to "TDM", (c) "Adaptive" is not
supported in 5 MHz channel bandwidth, (d) "2:1" and "1:2" are not supported in 5 MHz
channel bandwidth.
Spectrum Management Control: Is used to configure the PTP 600 Series Bridge's
Spectrum Management features, see Section 8.3.7 "Spectrum Management" for more details.
i-DFS is the abbreviation for intelligent Dynamic Frequency Selection. This feature continually
monitors the spectrum looking for the channel with the lowest level of on channel and co-
channel interference. Fixed frequency mode allows the installer to fix transmit and receive
frequencies on the units. The frequencies may be configured symmetrically or
asymmetrically. Only 30MHz channels are available in regions that mandate DFS (Radar
Detection), and the Spectrum Management Control may not be available because the
regulations for some regions force DFS, others force fixed frequency (for example 2.5 GHz).
Lower Center Frequency: Not displayed for the PTP 49600. Not displayed when Spectrum
Management Control is set to "i-DFS". The software for the PTP 600 Series Bridge allows a
user to optionally adjust the channel center frequencies. Changing the Lower Center
Frequency attribute causes all channel center frequencies to be offset. It effectively slides the
channelization up or down. See Sections 5.5 to 5.11, depending on the frequency variant.
NOTE: Because the 4.9 GHz spectrum is restricted by license, the Lower Center Frequency
is fixed for the PTP 49600 and is therefore not displayed.
160
8 Web Page Reference