16
ASYNC MP LINE DRIVER CARD
NOTE
The Async MP Line Driver Card can only communicate in a closed data
circuit with another Async MP Line Driver Card. The Card will NOT work
with dial-up analog circuits, like those used with a standard Hayes-type
modem. For more information about acceptable wire grades, see
Appendix A.
Point-to-Point Twisted-Pair Connection
The 6-position RJ-11 jack for the Async MP Line Driver Card is prewired for a
standard telco wiring environment. To connect a 4-wire twisted-pair circuit
between two or more Cards, you’ll need a crossover cable as shown in
Tables 4-1
and
4-2
and
Figure 4-2
.
Table 4-1. RJ-11 Cable Pinout.
Signal
Pin #
Color
Color
Pin #
Signal
GND*
1
Blue** - - - - - - - - - - - White
6
GND*
RCV-***
2
Yellow - - - - - - - - - - - Red
4
XMT-
XMT+
3
Green - - - - - - - - - - - Black
5
RCV+
XMT-
4
Red - - - - - - - - - - - - - Yellow
2
RCV-
RCV+
5
Black - - - - - - - - - - - - Green
3
XMT+
GND*
6
White - - - - - - - - - - - - Blue
1
GND*
*Connection to ground is optional.
**Standard color codes—yours may be different.
***The Async MP Line Driver Card is not sensitive to polarity.
Figure 4-2. AT&T Standard Modular Color Codes.
Multipoint Twisted-Pair Connection
The Async MP Line Driver Card supports multipoint applications using a star
topology (review
Section 3.2.2
for proper multipoint configuration). Maximum
distance between the units will vary based upon the number of drops, data rate,
wire gauge, etc. Call Black Box Technical Support at 724-746-5500 for specific
distance estimates.
Figure 4-3
shows how to wire two-pair cables properly for an
Async MP Line Driver Card star topology.
1 - Blue
2 - Yellow
3 - Green
4 - Red
5 - Black
6 - White
