Verilink AS56/56Plus (896-502588-001) Product Manual - Manual (Page 23)

LED Indicators
AS56 and AS56 Plus User Manual 2-5
LED Indicators
There are seven LED indicators on the front panel. They are used to
indicate the status of various alarm and call conditions. They monitor two
areas of Access Syst em56 operation: Network Interface (NI) and Serial
Port.
Network Interface All Network LEDs should be OFF during normal operation.
LP. Illuminates when either the Network Interface is in a loopback state.
BPV. Illuminates when Bipolar Violations are being received from the
Network. Can also indicated a very weak or overly strong signal.
AL. Illuminates when receive alarm condition (Red, Yellow, etc.) is
detected on the network interface.
DEN. Used only in T1/FT1 mode. Indicates that the Network Interface is
forcing the required number of transmitted “ones” to satisfy the T1
network requirements. This could be a result of improper configuration or
failure of the customer’s attached Serial Port equipment and will result in
data corruption.
Serial Port TST. Indicates the status of the BERT test if in progress. Will be ON only
if the test results are good.
LP. Illuminates when a loop condition exists in the serial port either at the
local or remote end.
DCD. Illuminates when the state of the Data Carrier Detect (or
equivalent) lead being transmitted to the DTE connected to the serial port
is ON or HIGH.