Metrodata FM4900, User Manual

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INTRODUCING THE FM4900
9 76-02-011F
4 INTRODUCING THE FM4900
The FM4900 is supplied in a metal enclosure for tabletop or 19” rack mounting using the
optional rack mounting ears that bolt onto the side of the module.
4. 1 Front panel
Figure 4. 1 FM4900 front panel
The FM4900 provides you with essential information through a series of LED’s on the front
panel. The colour of some of these LED’s will depend on the type of data that is being
handled at the time, and these are described in Figure 4.2 below.
Figure 4. 2 Front panel alarms
LED Colour Meaning
Power Red Mains power is being received.
Line
Major
Minor
Red
Yellow
LOS, LOF or SQ alarm is present
AIS or RAI alarm is present.
DTE
Fault Red The TT clock is out of specification or the FM4900 has a
hardware timing fault.
TX Data
and
RX Data
Red
Green
Orange
Data being transmitted or received = 1
Data being transmitted or received = 0
The data is switching rapidly between 0 and 1
Test
Red The E3 port is looped locally or remotely; or the remote
loop pattern has been sent.
Green The DTE port is looped, or the external DTE loop has
been selected