Setting The Configuration Straps; Rear-Card Configuration - Black Box Async 232 422/530 Manual

3.2 Setting the Configuration Straps

The Async 232↔422/530 Card contains two sets of configuration jumpers,
which allow you to set the function of both front-panel "Carrier Detect" LEDs
and the CD signal exiting the rear interface card in the rack. Since the Async
232↔422/530 Card contains two converters, each unit can be configured
separately.
Both "Carrier Detect" straps can be set to "Normal" or "Always on." When
operating normally, the "CD" LED will blink to indicate the presence or
absence of the carrier. When set to "Always on," the CD LED will always
indicate that the carrier is ON. The table below summarizes the jumper
settings. The default position is "Always on."
Jumper
JP1—Unit A
JP2—Unit B

3.3 Rear-Card Configuration

The Async 232↔422/530 Card has two interface-card options: the IC474C
(which comes equipped with two RJ-11 ports and two RJ-45 ports) and the
IC475C (which comes equipped with four RJ-45 ports). Figure 3-3 shows
these options.
Interface Card Jumper Summary Table
Function
Carrier Detect
Carrier Detect
CHAPTER 3: Configuration
Position 1 & 2
"Always ON" "Normal"
"Always ON" "Normal"
Position 2 & 3
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