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Commissioning and Maintenance
36 (42)
© Nokia Networks Oy
DN99611394
Issue 2-0 en
A.2
FXC RRI unit alarms
AIS 2M
Severity: Major
Unit/SB type:
1) Flexbus channel
2) Platform interface
Fault code: 66
Consequence:
Meaning: Alarm signal is received, the received signal has no framing and it is all ones.
Instructions: The signal is cut somewhere in the network and AIS replacement has taken place. Follow the 2M
signal in the network to find out the place where AIS replacement has been done. This link is usually faulty or
has configuration errors. Other alarms may cause this alarm because of AIS switching in the receiving direction
as shown in the Consequence field of some alarms.
Cancelling:
Alarm signal received
Severity: Critical
Unit/SB type: Flexbus
Fault code: 64
Consequence: AIS is connected to all received Flexbus channels. This will cause
AIS 2 Mbit/s alarm to all used platform interfaces that are connected to the alarming
Flexbus interface.
Meaning: OU has lost the frame lock and it has replaced the frame with a pseudo frame to ensure IU - OU
communication.
Instructions: The signal may be faded in the radio path. In this case the OU has the loss of incoming radio signal
alarm. If this is not active in the OU, check the radios at both ends of the hop. They must have the right
configuration (frequency, interleaving and TX power on). Check also that the same capacity has been selected
for both ends of the hop.
Cancelling: If the radio signal is faded it will come back when the fading stops. If the OU is FlexiHopper, check
the maximum TX power setting. If a stronger TX power is allowed, it will withstand fading better.
Содержание MetroHopper
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