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4.4.2 MULTIPOINT TWISTED PAIR CONNECTION
The Model 1012ARC supports multipoint applications using a star
topology. Maximum distance between the units will vary based upon
the number of drops, data rate, wire gauge, etc. Call Patton Technical
Support for specific distance estimates. Figure 6 shows how to wire
the cables properly for a Model 1012ARC star topology. Note that the
ground connection is not needed.
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5.0 OPERATION
Once you have configured each Model 1012ARC and connected
the cables, you are ready to operate the units. Section 5.0 describes
the LED status monitors and the power-up procedure.
5.1 LED STATUS MONITORS
The Model 1012ARC features thirteen front panel status LEDs that
indicate the condition of the modem and communication link. Figure 8
shows the relative front panel positions of the LEDs. Following Figure
8 is a description of each LED’s function.
• The “PWR” LED glows when power is being applied to the
modem card through its mid-plane chassis connection.
• The “TD” and “RD” indicators glow green to show a positive
voltage on the interface, and glow red to show negative voltage or
an idle data state.
• The “CD” indicators glow green to show a positive voltage on the
interface, and glow red to show negative voltage or an idle data
state.
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HOST FIRST SLAVE SECOND SLAVE
XMT+ RCV+
RCV+
XMT- RCV-
RCV-
RCV+ XMT+
XMT+
RCV- XMT-
XMT-
Figure 6. Star wiring for Model 1012ARC host and slaves
1 - Blue
2 - Orange
3 - Black
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
1 - Blue
2 - Yellow
3 - Green
4 - Red
5 - Black
6 - White
Figure 7. AT&T standard modular color codes
Notice! Any modular twisted pair cable connected to the
Model 1012ARC must be shielded cable, and the outer shield
must be properly terminated to a shielded modular plug on both
ends of the cable.
Figure 8. The Model 1012ARC front panel, showing LED positions
Model 1012ARC
Power
TD
RD
CD
TD
RD
CD
Unit
A
Unit
B
Channel A
Channel B