User's Manual

Table Of Contents
8 Web Page Reference
172
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”:
Lower: 2496 MHz to 2568 MHz
Middle: 2572 MHz to 2614 MHz
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:
For PTP 25600, PTP 45600, PTP 54600, PTP 58600 and PTP 59600, Channel
Bandwidth may be 30, 15, 10 or 5 MHz.
For PTP 48600 and PTP 49600, Channel Bandwidth may be 20, 10 or 5 MHz.
Link Symmetry: (Master only) Values of "Adaptive", "2 to 1", "1 to 1" and "1 to 2" can be
selected. The adaptive setting allows link symmetry to vary dynamically in response to offered
traffic load. The remaining values select three options for fixed division between transmit and
receive time in the TDD frame of the master ODU. The first number in the ratio represents the
time allowed for the transmit direction and the second number represents the time allowed for
the receive direction. The appropriate matching Link Symmetry is set at the slave ODU
automatically. For example, if Link Symmetry is configured as “2 to 1” at the master ODU,
then the slave ODU will be set automatically as “1 to 2”. In this example, the master-slave
direction has double the capacity of the slave-master direction.
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 to 1" and "1 to 2" are not supported in 5 MHz
channel bandwidth, (e) “2 to 1” and “1 to 2” are not supported when E1/T1 services are
enabled.
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 i
s 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).