Comtech EF Data CRS-200 REDUNDANCY SWITCH - Manual (Page 9)

CRS-200 COMTECH COMMUNICATIONS CORPORATION
CRS-200 REDUNDANCY SWITCH - OPERATIONS MANUAL PAGE 7
4 PHYSICAL DESCRIPTION
The CRS-200 is constructed as a 4U high rack-mounting chassis, that can be free-standing,
if desired. It is provided with rack-handles at the front to facilitate its removal from, and
placement into a rack.
4.1 FRONT PANEL - See Figure 1
On the front panel of the unit are the Vacuum Fluorescent Display (VFD), keypad, and
several LED indicators. The user enters data via the keypad, and messages are displayed on
the VFD. Behind the front panel there is also an audio alarm, that can be controlled to
respond to various faults.
The Vacuum Fluorescent Display (VFD) is an active display showing 2 lines, each of 24
characters. It produces a pleasing 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 3 LED indicators at the top of the front panel that reflect the condition of the switch
itself. The functions of these indicators are shown in Table 1 below.
TABLE 1 - SWITCH LED INDICATORS
LED Color Condition
Unit Status Red A Switch Fault exists (Example: PSU fault)
Green No Switch Faults
Stored
Event
Off There are no Stored Events
Orange There are Stored Events, either for the switch itself or the
modems attached to it
Remote Off The Switch is in Local Mode - remote monitoring is possible,
but no remote control
Orange The Switch is in Remote Mode – control changes are
disabled via the front panel keypad