User Guide: Technical Reference SECTION 4 NETWORK MANAGEMENT FOR
ioLink 4
PRELIMINARY
Customer Support (202) 333-7031
4-5
4.5 Error/Alarm Monitoring
There are several error and alarm conditions for DSX-1 devices that are described in RFC 1406. In
addition to these, the
ioWave
Management Information Base
(MIB) provides alarm conditions for features
not included in RFC 1406. The additional alarms that may be monitored are as described below. All of the
following indications may be used for troubleshooting as described in Section 5.
4.5.1 Near-end Related Alarms
a. Transmit
LOS:
This alarm is caused by a loss of signal from the user’s device into the DSX or
E1 interface. In addition to causing the Alarm LED to light, it will cause the TX Data LED to be
extinguished. The likely causes of this alarm condition are that the user’s input device has been
turned off or disconnected from the modem.
b. LIU not responding:
This alarm indicates an error with the communication between the control
processor and the line-interface chip. This is generally a fatal alarm condition in that it indicates a
component failure.
c. Firmware not responding:
This alarm indicates an error with the communication between the
control processor and the firmware controlling the FEC and spreading chips. This is generally a
fatal alarm condition in that it indicates a component failure.
4.5.2
RF or Far-end Related Alarms
a.
FEC BRE > x.x E-x:
TBD.
b. FEC decoder not locked:
This alarm indicates that the forward error correction circuitry has
discovered an error in the bit stream. If this is the only alarm condition, it is usually an indication
that there is a problem with the far-end modem. A possible corrective action for this alarm is to
power the far-end modem off and on.
c.
RX Low Signal Power:
This alarm is caused by a low value of signal power being received from
the RF unit. In addition to causing the Alarm LED to light, it will cause the RF Fault LED to light.
The likely causes of this alarm condition are that the RF unit has been disconnected from the
modem, the antenna has been disconnected from the RF unit, the RF unit has failed, or that the
far-end of the link is turned off or has failed.
d. RX Low Symbol Power:
This alarm is caused by a low value of demodulated symbol power
being received from the RF unit. If this alarm condition exists and “RX Low Signal” does not exist,
the likely causes of this alarm condition are that the far-end of the link is turned off or has failed.
