User's Guide Part 2

User Guide: PTP 600 Series Installation pages
phn-0896_009v003
Feb 2010
UNDER DEVELOPMENT
6-63
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
Link Symmetry is subject to the following restrictions:
o "Adaptive" is not supported in regions where radar avoidance is in use.
o "Adaptive" is not supported when link optimization is set to "TDM".
o "Adaptive" is not supported in 5 MHz channel bandwidth.
o "2 to 1" and "1 to 2" are not supported in 5 MHz channel bandwidth.
o “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 Spectrum Management features, see
Spectrum management on
page 6-22 for more details. In regions that do not mandate
DFS (Radar Detection), the Spectrum Management Control options are “i-DFS” and
“Fixed Frequency”. In regions that mandate DFS (Radar Detection), the Spectrum
Management Control options are “DFS” and “DFS with i-DFS”.
The Spectrum Management Control is disabled if the regulatory requirement is fixed
frequency only (for example if the frequency variant is PTP 25600).
Lower Center Frequency
Not displayed for the PTP 49600. Not displayed when Spectrum Management Control
is set to “Fixed Frequency”. The software for the PTP 600 Series 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.