The Tandberg Mcu - TANDBERG MCU User Manual

Introduction TANDBERG MCU

The TANDBERG MCU

Front view
The front of the MCU contains 24 Light Emitting Diodes (LEDs) organized in three groups. These diodes provide
information about PRI-line status, LAN (Ethernet) connection and power.
Red Alarm or Loss of signal (LOS) indicates that there is no signal and thus no framing info received. The same
effect will be obtained by pulling out the PRI cable. This may also be caused by a broken connector in the receive
(RX) part of the cable.
Yellow Alarm or Remote Alarm Indicator (RAI) means that the MCU is receiving framing info, but in this framing
info the other side tells the MCU that it is not reading the MCU's transmitted framing info. Typically, this may be a
broken connector in the transmit (TX) part of the PRI cable. This could also indicate weak or noisy signal in the
transmit (TX) part of the PRI cable.
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