Chapter 3. Physical Description; Front Panel; Rear Panel - Comtech EF Data CRS-100 Operation Manual

Chapter 3. PHYSICAL DESCRIPTION

The CRS-100 is constructed as a free-standing module measuring 1.7H x 5.7W x 4.1D
inches (4.3H x 14.5W x 10.4D cm), not including connectors.
3.1

Front Panel

On the front panel (Figure 3-1) of the unit is the main Data Interface connector, a 25 pin
'D' type female, and the main Tx and Rx IF connectors, which are BNC female. The pin
connections for the Data Interface connector are shown in Section 6. Also on the front
panel are two LEDs, marked 'A Online' and 'B Online'. Only one of these LEDs will
illuminated at any given time, and gives a visual indication of which of the two units is
presently carrying traffic.
3.2

Rear Panel

On the rear panel (Figure 3-1) of the unit are the two Data Interface connectors for the
'A' and 'B' units, each being 25 pin 'D' type male. These are connected to the Modems
using the two supplied cables, Comtech EF Data P/N CA/WR0056 (Universal Data
Interface Cable). Also on the rear panel is a ground stud, which may be used, if desired,
to bond the chassis of the unit to the system ground.
MN/CRS100.IOM
REMEMBER!
The top unit is 'A'
The bottom unit is 'B'
3–1