3.2 REAR CARD SETTINGS
The Model 1110RC is compatible with two dual-fiber interface cards,
one with dual ST connectors and one with dual SMA connectors. Both
cards use an HD-26 female for the RS-232 interface. The jumpers on
both interface cards function identically. Figure 2 (below) shows the
location of the jumpers.
3.2.1 HOW THE JUMPERS WORK
Figure 3 (below) shows the 3-pin jumpers used on the rear card.
The strap enables or disables a particular function depending upon
whether it straddles pins 1 and 2, or pins 2 and 3.
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Figure 3.
Orientation of interface card strap
1
2
3
1
2
3
1
2
3
Figure 2.
Model 1110RC rear card jumper location
JB1
(pin 1 on left)
DTE Shield (Pin 1) & FRGND (JB1)
In the connected (closed) position, this strap links DB-25 pin 1 and
frame ground. In the open (disconnected) position, pin 1 is “lifted” from
frame ground.
JB1
Position 1&2 = DTE Shield (Pin 1) and FRGND connected
Position 2&3 = DTE Shield (Pin 1) and FRGND not connected
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