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3.2 REAR CARD CONFIGURATION
The Model 1004ABRC has two interface card options: the 1Q11
(which comes equipped with two RJ-11 ports and two RJ-45 ports) and
the 1Q45 (which comes equipped with four RJ-45 ports). Figure 3
(below) illustrates these two different rear interface options.
Prior to installation, you should examine the rear card you have
selected and ensure that it is suitable for your application. Each rear
card is configured by setting straps on the PC board. Section 3.4.1
describes the strap locations and settings for each card.
3.2.1 REAR CARD STRAP SETTINGS
Figure 4 (below) shows the strap locations for the 1Q11 and the
1Q45 rear cards. These straps determine various grounding character-
istics for the RS-232 and twisted pair lines.
The table below provides a summary of the strap functions for
both of the rear cards. Following the table is a description of each
strap's function.
Line A Shield & Line B Shield (JB2 & JB4)
This strap pertains to the line interface. In the connected (closed)
position, the strap links RJ-11 pins 1 and 6 (RJ-45 pins 2 and 7) to
frame ground. These pins can be used as connections for the twisted
pair cable shield. In the open (disconnected) position, pins 1 and 6 (or
2 and 7) remain connected, but are “lifted” from frame ground.
JB2
Position 1&2 = Line A Shield Connected
Position 2&3 = No Shield
JB4
Position 1&2 = Line B Shield Connected
Position 2&3 = No Shield
SGND & FRGND (JB5)
In the connected (closed) position, this strap links signal ground
and frame ground. In the open (disconnected) position, pin 1 is “lifted”
from frame ground.
JB5
Position 1&2 = SGND and FRGND Connected
Position 2&3 = SGND and FRGND Not Connected
1Q11
1Q45
RJ-45
RJ-45
RJ-45
RJ-45
RJ-11
RJ-11
RJ-45
RJ-45
Figure 3. Model 1004ABRC interface card options
Twisted Pair Line
Connection
Twisted Pair
Line Connection
RS-232
Connection
RS-232
Connection
}
}
}
}
1
2
3
1
2
3
1
2
3
1
2
3
123
(Unit A)
JB2
JB4
JB5
JB6
JB7
(Unit B)
(Unit A)
(Unit B)
Twisted Pair Line
Connection
RS-232
Connection
}
}
Figure 4. Strap locations for both rear cards
Strap Position 1&2 Position 2&3
JB2 Line A Shield No Shield
†
JB4 Line B Shield No Shield
†
JB5 SGND & FRGND Open
†
JB6 DTE A DSR
†
N/A
JB7 DTE B DSR
†
N/A
INTERFACE CARD STRAP SUMMARY TABLE #1