Patton electronic 2710 - Manual (Page 26)

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Network Interface (NI) STATUS.
The Network interface (NI) status is shown in the
middle of the Diagnostics/Statistics screen. The
brackets are empty when the link is operating nor-
mally. In this example, various two or three-letter
messages are displayed within the brackets, illus-
trating what you may see if the Model 2710 is not
connected at all or is in a loss of signal condition.
Here are the eight status messages.
Excessive zeros [EXZ], i.e., lack of pulses, detected. This condition may
occur if the unit is not connected to the network, in which case the EXZ is
displayed continuously. If EXZ comes on intermittently, there may be a
frame, line code or data rate mismatch between the near and far-end
units.
Receiver Carrier Loss [RCL] occurs when 192 consecutive zeros have
been detected at the network interface. RCL clears when a pulse is
detected.
Frame Bit Error [FE] occurs when there is an error in the framing bit
sequence. This may happen due to a disconnected line, mismatched
framing formats or severe errors in the data stream. This error may indi-
cate a noisy line or cable condition. This error may indicate a noisy line
or cable connection if the frames appear to be set correctly.
Severe Frame Error [SE] occurs when the framing error exceeds a cer-
tain threshold of errors. This may happen due to a disconnected line, an
extremely noisy connection, or mismatched framing.
Loss of Sync [LOS] occurs when the T1 framer in the unit cannot syn-
chronize itself to the received data stream. This may happen due to a
disconnected line.
Out of Frame [OOF] occurs when no valid frame structure can be found.
This may happen due to a disconnected line or mismatched framing or
mismatched framing.
Alarm Indication Signal [AIS] indicates that the remote unit or the cen-
tral ofÞce is sending a Blue Alarm, because it is not receiving a signal;
the alarm is an unframed all-ones signal, mainly used to keep the line
alive and to indicate that it is not receiving any signal. This may indicate
that the local unit is receiving a good signal, but that the transmit link may
be broken.