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44..00 IINNSSTTAALLLLAATTIIOONN
When the Model 1089 has been properly configured, it may be
connected to the DSL twisted pair interface, the 10BaseT Ethernet
Interface, and the power source. This section describes these connec-
tions.
4.1 CONNECTING THE DSL INTERFACE
The Model 1089 supports communication between 10BaseT Hubs
or Workstations at distances to 5 miles (8 km) over 24 AWG (.5mm)
twisted pair wire. Two things are essential:
1. These units operate as a pair. Both units at the end of the
twisted pair DSL span must be set for the same DTE rate.
2. To function properly, the Model 1089 needs one twistedpair of
metallic wire. This twisted pair must be unconditioned, dry, metal-
lic wire, between 19 (.9mm) and 26 AWG (.4mm) (the higher num-
ber gauges will limit distance). Standard dial-up telephone cir-
cuits, or leased circuits that run through signal equalization equip-
ment, or standard, flat modular telephone type cable,
will not work!
The RJ-45 connector on the Model 1089’s twisted pair interface is
polarity insensitive and is wired for a two-wire interface. The signal/pin
relationships are shown in Figure 4 below.
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4.2 Connecting the 10Base-T Ethernet Port to a PC (DTE)
The 10Base-T interface is configured as DTE (Data Terminal
Equipment). If the Model 1089 is to to connect to another DTE device
such as a 10Base-T network interface card, construct a 10Base-T
crossover cable and connect the wires as shown in the diagram below.
10BaseT Port 10Base-T DTE
RJ-45 Pin No. RJ-45 Pin No.
1 (TX+) 1 (TX+)
2 (TX-) 2 (TX-)
3 (RX+) 3 (RX+)
6 (RX-) 6 (RX-)
4.3 Connecting the 10Base-T Ethernet Port to a Hub
The 10Base-T interface is configured as DTE (Data Terminal
Equipment), just like a 10Base-T network interface card in a PC.
Therefore, it “expects” to connect to a 10Base-T Hub using a straight-
through RJ-45 cable. Use the diagram below to construct a cable to
connect the 10 BaseT interface to a 10Base-T Hub.
10BaseT Port 10Base-T Hub
RJ-45 Pin No. RJ-45 Pin No.
1 (TD+) 1 (RD+)
2 (TD-) 2 (RD-)
3 (RD+) 3 (TD+)
6 (RD-) 6 (TD-)
Figure 4. Model 1089 twisted pair line interface.
10BaseT
Interface
1 (N/C)
2 (N/C)
3 (N/C)
4 (2-Wire TIP)
5 (2-Wire RING)
6 (N/C)
7 (N/C)
8 (N/C)
DSL Interface
1
2
3
4
5
6
7
8
1 TD+ (data output from 1089)
2 TD- (data output from 1089)
3 RD+ (data input to 1089)
4 (no connection)
5 (no connection)
6 RD- (data input to 1089)
7 (no connection)
8 (no connection)
1
2
3
4
5
6
7
8
Figure 5. Model 1089 10BaseT Ethernet RJ-45 Connector Pinout
Figure 3. Model 1089 Rear Panel
IMPORTANT!: The Model 1089 has been optimized for per-
formance at high bitrates (DTE rates greater than 512 kbps). To
ensure accurate performance at these bit rates, please use twisted
pair line interface cable that is at least 330ft (100m) in length.