Paradise Datacom 4 RU Chassis, Руководство по эксплуатации

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44 201627 REV X 4 RU SSPA Chassis Operations Manual
See
Section 4.3
for directions on changing the N+1 hierarchy of SSPAs in an active
system.
2.4.4 Adjust system gain
Nominal system gain with Auto Gain enabled is 65 dB; nominal system gain with Auto
Gain disabled is 70 dB.
To adjust the gain of the system, select the [MAIN MENU] key
→ 3.Operation →
5.Attenuation. Alternately, from any of the System Information menus described in
Section 2.2.1
, press either the [ ◄ ] or right [ ► ] arrow key. Enter a value between 0 and
20.0 dB. If Auto Gain is enabled, the system will reserve 5 dB of attenuator range for
gain compensation and attenuation is limited to a value between 0 and 15.0 dB.
2.4.5 N+1 Automatic gain control option
Any modular hitless SSPA system may exhibit natural gain drift when one or more indi-
vidual SSPA chassis is removed from the system or malfunctions. The automatic gain
control option allows the system to maintain a constant gain level during such events.
This feature is user selectable and can be activated from the SSPA front panel or a re-
mote interface.
To toggle Automatic Gain Control, press the [MAIN MENU] key
→ 6.Redundancy →
6.N+1 → 3.Gain Control. Select either Auto Gain On or Auto Gain Off.
When this option is activated, the SSPA will automatically reserve 5 dB of attenuator
range for future gain compensation. This will reduce the maximum SSPA gain by 5 dB.
The attenuator range will also be reduced to 15 dB.
Five dB of reserved attenuator range will allow the system to fully auto compensate
gain when one SSPA module in a single 4RU Chassis enters a fault condition.
2.4.6 N+1 RF power measurements
The N+1 system may be equipped with a dedicated RF power measurement unit. The
RF Power Detector provides RMS measurement of Forward and Reflected RF power
directly at the output waveguide and this reading is acquired by the N+1 Master unit.
Besides N+1 system level power detection, each individual SSPA unit may be
equipped with its own RF power detector. This reading can be viewed at each SSPA
unit and may be used for troubleshooting individual SSPA units.
To view the RF power detector reading on the front panel, select the [MAIN MENU] key
→ 1.SysInfo → down [ ▼ ] arrow to get to Sys Info Page 1.