Patton electronic 1080A-64 - Manual (Page 17)

17
Two-Wire Cable Connection Via Terminal Blocks
If you are not going to use the modular jacks, follow the instructions
below.
1. Locate the terminal block on the back of the unit. It should look like
the following diagram:
Note The “+” and “-” indicators are for reference only. The Model
1080A Series is not sensitive to polarity.
2. Connect one wire of the pair to a Transmit lug (TX+ or TX-) on both
the local and remote Model 1080A.
3. Connect the other wire of the pair to the other Transmit lug on both
the local and remote Model 1080A.
4. If there is a shield around the telephone cable, it may be connected
to GND 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:
4.2 FOUR-WIRE INSTALLATION
When communicating over a two twisted pair circuit, the Model Series
can operate full or half duplex, point-to-point or multipoint. In two pair
point-to-point applications, you will need a
pair of Model 1080As for each
circuit—one at each end of the single pair wire. In two pair multipoint
applications you will need three or more Model 1080A Series units.
These can be connected using a star topology, although a daisy chain
topology is usually used.
RX+ RX- GND TX- TX+
XMT XMT
XMT XMT
GND GND To Shield (Optional)
}
One Pair