3.2 REAR CARD CONFIGURATION
The Model 2017RC 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 4
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 3.2.1
describes the strap locations and settings for each card.
3.2.1 REAR CARD STRAP SETTINGS
Figure 5 shows the strap locations for the 1Q11 and the 1Q45 rear
cards. These straps determine various grounding characteristics for
the RS-232 and twisted pair lines.
7
Figure 4.
Model 1000RC rear interface card options
RJ-11/6
RJ-45/10
1Q45
1Q11
RJ-11/6
RJ-45/10
RJ-45/10
RJ-45/10
RJ-45/10
RJ-45/10
Figure 5.
Strap locations for both rear cards
1
2
3
1
2
3
1
2
3
1
2
3
1 2 3
(Unit A)
JB2
JB4
JB6
JB7
JB5
(Unit B)
(Unit A)
(Unit B)
Converter
twisted pair
}
}
The table below provides a summary of strap functions for both of
the rear cards. Descriptions of each strap follow the table.
Line A Shield & Line B Shield (JB2 & JB4)
This strap pertains to the line interface. In position 1&2, the strap
links RJ-11 pins 1 and 6 (RJ-45 pins 2 and 7) to frame ground and the
rear panel. These pins can be used as connections for the twisted pair
cable shield. In position 2&3, pins 1 and 6 (or 2 and 7) are
disconnected from frame ground.
JB2
Position 1&2 = Line A Shield Connected to Frame Ground
Position 2&3 = No Shield
JB4
Position 1&2 = Line B Shield Connected to Frame Ground
Position 2&3 = No Shield
SGND & FRGND (JB5)
In position 1&2, this strap links signal ground and frame ground
through a 100 Ohm, 1/2 W resistor. In position 2&3, pin 1 is “not
connected to frame ground.
JB5
Position 1&2 = SGND and FRGND Connected
Position 2&3 = SGND and FRGND Not Connected
8
Strap
Position 1&2
Position 2&3
JB2
Line A Shield
No Shield
†
JB4
Line B Shield
No Shield
†
JB5
SGND & FRGND*
Open (Not Connected)
†
JB6
Unit A DSR
†
N/A
JB7
Unit B DSR
†
N/A
INTERFACE CARD STRAP SUMMARY TABLE #1
NOTE
†
indicates factory default
*via 100 ohm resistor
