American Fibertek Net I/O N-664 - Manual (Page 12)

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LED indicators: power up sequencing
Within 5 seconds of the AC power cable being connected, the N-664 will perform a test
of its front panel indicator LEDs. It will light each LED in sequence, starting with the
leftmost LED and proceeding from left to right. The LEDS will first light green, then red,
then turn off. Once the sequence has finished the LEDs will resume their normal
function and the unit will be ready for use.
LED indicators: normal functions
The front panel of the N-664 has several LED indicators. These indicators are grouped
into 6 pairs for indicating the status of the aux/alarm contact ports, and four pairs for
indicating the status of the serial ports. The action of individual LEDS is as follows:
AUX CONTACT IN
The upper LED in each AUX CONTACT pair indicates the status of the Alarm In
connection for that contact port. This LED will illuminate red when that Alarm In is
active. Active can indicate either that the contact is open, or that the contact is closed,
depending on the setting in the “Alarm Setup” management page chosen for that alarm
input.
AUX CONTACT OUT
The lower LED in each AUX CONTACT pair indicates the status of the Aux Out
connection for that contact port. This LED will illuminate red when that Aux Contact Out
connection is active. Active indicates that the C terminal on the port is now connected to
the NO terminal and disconnected from the NC terminal.
SERIAL RX
The upper LED in each SERIAL pair indicates the presence of data incoming on that
hardware port. When data is being received from attached customer equipment and
transmitted over an active network link, that RX led will flash green.
SERIAL TX
The lower LED in each SERIAL pair indicates the presence of data outgoing on that
hardware port. When data from an active network connection is being sent out on that
port, the TX led will flash red.
Real-time clock
The N-664’s real-time clock and calendar (RTC) uses a lithium battery to retain time and
date settings while the unit is not powered. It is strongly recommended that you not
attempt to replace this battery without technical assistance from AFI.