Verilink AS56/56Plus (896-502588-001) Product Manual - Manual (Page 69)

Alarm Definitions
AS56 and AS56 Plus User Manual 5-3
Alarm Definitions
This section discusses the alarm definitions that apply to T1/FT1 mode
and 56/64 kbps DDS mode.
T1/FT1 mode AIS. An unframed “all ones” condition has been detected.
LOS. Loss of Signal. At least 32 consecutive zeroes have been received
at the network interface.
Red Alarm. A “loss of frame alignment” has occurred and
synchronization has been lost.
Yellow Alarm. A Yellow Alarm is generated by the network and sent to
the customer premises. It usually means that the network is not receiving
the Access Syste m56 unit’s signalling correctly.
Framing Errors. One or more frame alignment bit errors have been
detected. This does not mean that synchronization has been lost.
CRC6 Alar m One or more CRC6 block errors have been detected. The
D4 framing does not include CRC6; the Access Sy stem56 unit replaces
that parameter by counting the number of framing bit errors. The result is
a useful picture over time regarding D4 link performance.
BPV. Bipolar Violations have been detected. This usually indicates that
a very weak or overly strong signal is being received from the network or
the cabling has been compromised.
56/64 kbps DDS
mode LOS. Loss of Signal. Received from network port.
OOS Out of Service. Received from network port.
OOF . Out of Frame. Received from network port.
CMI. Control Mode Idle. Received from network port.
Ferr. Framing Errors. One or more frame alignment bit errors have been
detected. This does not mean that synchronization has been lost.