Trango Systems TrangoLINK APEX 18 User Manual page 35

Power: Transmit power (dBm). Transmit power is controlled by two settings. First, the
TrangoLINK APEX™ has equipment specifications (described in the Specification
Appendix) that are a function of the channel bandwidth and signal modulation. At no
time should the transmit power be set for a value greater than specified since this will
degrade the link availability (BER will increase). Second, the FCC License grant may
constrain power below what the TrangoLINK APEX™ can deliver so as to ensure there
is no interference with an existing user. So the Power should be set to the lower of
these two values (equipment limitations and FCC license grant).
Target RSSI: This is the RSSI value the unit will try to achieve if ATPC is enabled on
both sides of the link.
Speed: Set the channel bandwidth (in MHz) in accordance with the FCC License grant
using the channel_bw command and the modulation type should be selected from the
pull-down menu in accordance with the Link Design
The TrangoLINK APEX™ is shipped with default values
!
•
Speed - 16 QAM and 10 MHz bandwidth which protect the user from inadvertently
violating FCC constraints
•
ACM - Disabled
When the user enables the ACM feature, the default threshold values are used. Please
refer to Table 4 for threshold values. This setting is not user adjustable.
Loopback Mode: The settings allows for internal testing of the unit via loopback testing.
There are 5 Loopback Mode settings OFF, IF, Digital, RF gen, and RF refl.
OPMODE MUST BE OFF FOR DIGITAL LOOPBAK ONLY. OPMODE MUST BE ON FOR
!
IF LOOPBACK MODES. RF_GEN AND RF_REFL ARE NOT AVAILABLE CURRENTLY
AND WILL BE ADDED IN A FUTURE RELEASE.
Data Pattern: This setting will determine the source of the signal for the Loopback
testing. There are 2 Data (loopback) patterns FPGA which is an external signal and
Modem which is an internal signal source. Normal operation mode is External. Internal
traffic is used to generate random data to measure BER. All user data from GigE ports
will be dropped when the datapath is set to internal mode.
ATPC Max Power: This setting will limit the maximum output power to be used if ATPC
is enabled.
ATPC Step Size: This setting will limit the amount of increase or decrease in a single
"step" of power adjustment.
TrangoLINK Apex™ 18 User Manual Rev. 1.0 Section: Chapter 3 - Configuration Page 33