Tx Alm 1 Indicator (Only For 1+1 System); Tx Alm 2 Indicator (Only For 1+1 System) - NEC PASOLINK Training Course

OPERATION
3-22

TX ALM 1 indicator (Only for 1+1 system):

Lights when:
• Transmitter RF output power decreases 3 dB from normal at the
No. 1 channel ODU,
• APC loop of the local oscillator unlocks or IF signal from the IDU
is lost at the No. 1 channel ODU,
• Output data stream or master clock signal is lost at the No. 1
channel DPU (TX),
• VCO synchronization is lost at the No. 1 channel MOD,
• If a 2 MB is fed to a CH which is selected as "Not Used"
(selectable) at the No. 1 channel IDU,
• If a 2 MB is fed to the WS CH after setting to "Not Used"
(selectable) at the No. 1 channel IDU,
• Communication between CPU of No. 1 channel ODU and CPU on
the IDU is lost.

TX ALM 2 indicator (Only for 1+1 system)

Lights when:
• Transmitter RF output power decreases 3 dB from normal at the
No. 2 channel ODU,
• APC loop of the local oscillator unlocks or IF signal from the IDU
is lost at the No. 2 channel ODU,
• Output data stream or master clock signal is lost at the No. 2
channel DPU (TX),
• VCO synchronization is lost at the No. 2 channel MOD,
• If a 2 MB is fed to a CH which is selected as "Not Used"
(selectable) at the No. 2 channel IDU,
• If a 2 MB is fed to the WS CH after setting to "Not Used"
(selectable) at the No. 2 channel IDU,
• Communication between CPU of No. 2 channel ODU and CPU on
the IDU is lost.
ROI-S04488