Patton electronic 1080A-64 - Manual (Page 19)

19
Four-Wire Cable Connection Via Terminal Blocks
If you are not going to use the modular jacks then follow the instructions
below.
1. Locate the terminal block on the back of the unit. It should look like
the following diagram:
* The “+” and “-” indicators are for reference only.
The Model 1080A Series is not sensitive to polarity.
2. Connect one pair of wires in the telephone cable to the Transmit
lugs (TX+ and TX-) on the terminal block.
3. Connect the other pair of wires in the telephone cable to the Receive
lugs (RX+ and RX-) on the terminal block.
4. If there is a shield around the telephone cable, it may be connected
to "G" on the terminal block. We recommend connecting the shield
at the computer end only to avoid ground loops. A ground wire is not
necessary for proper operation of these units.
5. When you finish connecting the telephone line to units at both ends,
it should look like the following diagram:
4.3 FOUR-WIRE, MULTIPOINT INSTALLATION
Multipoint operation involves the connection of several terminals to one
host port. In such an application, one local Model 1080A is used as a
master unit, and it is connected to several remote Model 1080As that are
acting as slaves. Up to 25 Model 1080A Series slaves may be connected
to one host Model 1080A Series master SRM, provided that the comput-
ing hardware and software support that many terminal drops.
In a multipoint environment the master Model 1080A transmits continu-
ally. Initiation of two-way communication is carrier-controlled by each
“slave” Model 1080A Series unit.
RX+ RX- GND TX- TX+
XMT RCV
XMT RCV
G G
RCV XMT
RCV XMT
To Shield (Optional)
}
One Pair
}
One Pair