Comtech EF Data CDM-750 - Manual (Page 80)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Front Panel Operation MN-CDM750
5–2
5.1.1 LED Indicators
In general, the Alarm relay state will reflect the state of
the Front Panel LEDs. For instance, if the Unit Status LED
is red, the Unit Alarm relay will be active, etc. The one
exception is the Transmit Traffic relay: This activates
only if a Transmit Traffic Fault exists – it does not reflect
the state of the Tx carrier.
The function of the eight front panel LED indicators is as follows:
LED Indication Description
UNIT STATUS
Green No Unit Faults, or Traffic (Tx or Rx) Faults
Amber A Unit, Tx, or Rx Alarm exits
Red A Unit, Tx or Rx Fault exists (Example: PSU fault)
Tx
TRAFFIC
Green The Tx Traffic path hardware and firmware are not faulted
Off The Tx Traffic path hardware and/or firmware are faulted
Rx TRAFFIC
Green
Tx Traffic is passing normally (demod and decoder are locked, everything is
OK)
Off
An Rx Traffic fault exists (the demod may still be OK)
NOTE: By convention demodulator unlock is a fault – even though it is likely
due to a missing carrier
ONLINE
Green The Unit is online, and carrying traffic
Off
The Unit is offline (standby) – forced by externally connected 1:1 or 1:N
redundancy system
STORED EVENT
Amber
There is a Stored Event in the log, which can be viewed from the front panel, or
retrieved via the remote control interface
Off There are no Stored Events
TRANSMITTER ON
Green The Tx IF is ON.
Off The Tx IF is OFF.
REMOTE
Amber
The Unit is in Remote Mode – Remote monitoring and control is available.
Local monitoring and control is always available.
Off
The Unit is in Local Mode – remote monitoring is possible, but remote control is
not available.
TEST MODE
Amber A Test Mode is selected (Example: IF Loopback)
Off There is no Test Mode currently selected