Front Panel; Table 4-1. Front Panel Led Indicators - Comtech EF Data CDM-550T Manual

Physical Description
4.1

Front Panel

On the front panel of the unit is the Vacuum Fluorescent Display (VFD), keypad, and
eight LED indicators. The user enters data via the keypad, and messages are displayed on
the VFD. The LEDs indicate, in a summary fashion, the status of the unit.
The Vacuum Fluorescent Display (VFD) is an active display showing 2 lines, each of 24
characters. It produces a blue light, the brightness of which can be controlled by the user.
It has greatly superior viewing characteristics compared to a Liquid Crystal Display
(LCD), and does not suffer problems of viewing angle or contrast.
The keypad comprises six individual keyswitches, mounted directly behind a fully sealed
membrane overlay. They have a positive 'click' action, which provides the user with
tactile feedback. These six switches are identified as UP ARROW, DOWN ARROW,
RIGHT ARROW, LEFT ARROW, ENTER and CLEAR.
The functions of these keys are described in the 'Front Panel Operation' section.
There are 8 LED indicators. The functions of these indicators are shown in the Table 4-1
below:
LED Color
Red
Unit
Orange
***
Status
Green
Transmit Green
***
Off
Traffic
Receive Green
***
Traffic Off
Green
On line
Off
Orange
Stored Event
Off
Orange
Remote
Off
EDMAC Orange
Mode
Off
Orange
Test Mode
Off
*** IMPORTANT NOTE REGARDING THE REATIONSHIP BETWEEN
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 will only be activated if a
Transmit Traffic Fault exists – it does not reflect the state of the TX carrier.
4–2

Table 4-1. Front Panel LED Indicators

A Unit Fault exists (Example: PSU fault)
No Unit Faults, but a Traffic Fault exists
No Unit Faults, or Traffic Faults
No Tx Traffic Faults
A Tx Traffic fault exists OR the Tx Carrier is in OFF state
No Rx Traffic Faults (demod and Viterbi decoder are locked, everything is OK)
An Rx Traffic fault exists (the demod may still be OK)
The Unit is On Line, and carrying traffic
The Unit is Off Line (standby) - forced by externally connected 1:1 or 1:N redundancy system
There is a Stored Event in the log, which can be viewed from the front panel, or retrieved via the
remote control interface
There are no Stored Events
The Unit is in Remote Mode - local monitoring is possible, but no local control
The Unit is in Local Mode - remote monitoring is possible, but no remote control
Framing on, EDMAC on, and unit defined as Slave
Either no EDMAC, EDMAC Master, or Transparent mode is selected
A Test Mode is selected (Example: IF Loopback)
There is no Test Mode currently selected
FRONT PANEL LEDS AND ALARM RELAYS:
CDM-550T Satellite Modem
Condition
Rev. 1.3