112 Aviat Networks
Chapter4. Eclipse Edge Configuration and Diagnostics
Auto Insertion of AIS on Tribs
This topic covers auto insertion of AIS on tribs when:
• A demodulator unlock occurs
• Loopbacks are set
Demodulator Unlock
When a Link demodulator-unlock occurs, it inserts an alarm signal (AIS) on all traffic
circuits towards the line/customer. Demodulator unlock may occur under severe
fading or an equipment fault.
An on-board master clock within the IDU maintains customer-facing clocking
references when the expected signal input and associated clocking reference from its
Link/RAC module is missing, or below the minimum level required.
Loopbacks
When loopbacks are applied:
•For a radio-facing tributary loopback, AIS is transmitted on the affected tributary
towards the customer.
•For a line-facing tributary loopback, and for a digital loopback, AIS is not
transmitted. Instead, as well as traffic from the customer being looped back towards
the customer, it is also transmitted in the radio facing direction of the affected
circuit(s).
AIS may also be forced onto a DAC tributary using the System
Control screen.
DAC ES Menu
The System/Controls Diagnostics screen for the DAC ES module displays port status,
operational mode, configured port and channel speeds, and current port and channel
throughputs. See Figure 4-40.
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