User Guide: Technical Reference SECTION 4 NETWORK MANAGEMENT FOR
ioLink 4
PRELIMINARY
Customer Support (202) 333-7031
4-6
e.
No Acquisition:
This alarm is caused by an acquisition failure by the de-spreading circuitry. The
likely source of failure is the loss of signal from the far end of the link. In addition to causing the
Alarm LED to light, it will cause the RX Data LED to be extinguished. If this alarm condition exists
and “RX Low Signal Power” does not exist, the likely causes of this alarm condition are either that
the far-end of the link is turned off (or has failed) or that the attenuation of the signal between the
antenna has increased. A possible corrective action for this alarm condition is to decrease the
Symbol Threshold on the “CONFIG Menu.”
f.
AIS:
Alarm Indicator Signal. This is caused by the modem receiving “all ones” from the DSX or
G.703 interface. This indicates that a failure of the “upstream,” or user, device has occurred.
