ROI-S04488 OPERATION
3-23
RX ALM 1 indicator (Only for 1+1 system)
Lights when:
• Receiver input level decreases lower than a preset value from
squelch level at the No. 1 channel ODU,
• APC loop of the local oscillator unlocks at the No. 1 channel ODU,
• IF signal is lost at the No. 1 channel DEM,
• High BER is worse than preset value (1 × 10
−3
) at the DPU,
• BER is worse than preset value at the No. 1 channel DPU (1 ×
10
−3
, 1 × 10
−4
, 1 × 10
−5
or 1 × 10
−6
selectable),
• Frame synchronization is lost at the No. 1 channel DPU,
• Communication between CPU of No. 1 channel ODU and CPU of
the IDU is lost.
RX ALM 2 indicator (Only for 1+1 system)
Lights when:
• Receiver input level decreases lower than a preset value from
squelch level at the No. 2 channel ODU,
• APC loop of the local oscillator unlocks at the No. 2 channel ODU,
• IF signal is lost at the No. 2 channel DEM,
• High BER is worse than preset value (1 × 10
−3
) at the No. 2
channel DPU,
• BER is worse than preset value at the No. 2 channel DPU (1 ×
10
−3
, 1 × 10
−4
, 1 × 10
−5
or 1 × 10
−6
selectable),
• Frame synchronization is lost at the No. 2 channel DPU,
• Communication between CPU of No. 2 channel ODU and CPU of
the IDU is lost.
TX OPR 1 indicator (Only for 1+1 system):
Lights when the modulator and transmitter of No. 1 channel are
selected.
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