User's Manual

Commands
SkyZhone 45 Installation Guide
47
D
R
AFT
The following example adds 6 dB of attenuation to the receive path within the
ODU:
@ S R 0 0 0 0 0 4 ! <Enter>
The first three characters @ S R begin the command string for set receive
attenuation.
The fourth character, 0, defines the unit number, which is always zero.
The fifth through seventh characters are 0.
The eighth and ninth characters, 0 4, set the HEX attenuation value (see
Table 15).
The last two keystrokes of the command are ! <Enter>.
Table 15 shows the attenuation in Db. The resultant receive level at the
antenna is -80 dBm, before antenna gains. (The high signal level is only on
the shortest paths.) Calculations are based on antenna gain plus 1 dB loss in
the Zhone-supplied antenna cable. If the Receive Signal Level (RSL) is
calculated to be above -40 dBm, attenuation should be added using this
command. The SkyZhone 45 will perform best with a RSL between -50 and
-60 dBm.
Table 15: Receive attenuation settings
Attenuator setting
(HEX)
Attenuation
inserted into
receive path
RSL at receiver
using 2’ antenna
(29 dB gain)
RSL at receiver
using 4’ antenna
(33 dB gain)
RSL at receiver
using 6’ antenna
(37 dB gain)
00 0 dB -52 dBm -48 dBm -44 dBm
Caution: The attenuator setting “00” should only be used during ODU testing. The antennas offered
with SkyZhone 45 provide more EIRP at this power setting than allowed for operation in the United
States under Part 15.407 of the FCC rules.
02 -2 dB -54 dBm -50 dBm -46 dBm
03 -4 dB -56 dBm -52 dBm -48 dBm
04 -6 dB -58 dBm -54 dBm -50 dBm
05 -8 dB -60 dBm -56 dBm -52 dBm
06 -10 dB -62 dBm -58 dBm -54 dBm
07 -12 dB -64 dBm -60 dBm -56 dBm
08 -14 dB -66 dBm -62 dBm -58 dBm
09 -16 dB -68 dBm -64 dBm -60 dBm
0A -18 dB -70 dBm -66 dBm -62 dBm
0B -20 dB -72 dBm -68 dBm -64 dBm
0C -22 dB -74 dBm -70 dBm -66 dBm