Connection to the Twisted Pair Interface

4.0 INSTALLATION

Once the Model 1092 is properly configured, it is ready to connect to the twisted pair interface, to the serial port, and to the power source. This section tells you how to make these connections.

4.1 CONNECTION TO THE TWISTED PAIR INTERFACE

The Model 1092 supports communication between two DTE devices at distances to 5 miles (24 AWG) and data rates to 128 kbps (sync) or 38.4 kbps (asynchronous). There are two essential requirements for installing the Model 1092:

1.These units work in pairs. Therefore, you must have one Model 1092 (or a compatible model) at each end of a single twisted pair interface.

2.To function properly, the Model 1092 needs one twisted pair of metallic wire. This twisted pair must be unconditioned, dry, metallic wire, between 19 and 26 AWG (the higher number gauges may limit distance somewhat). Standard dial-up telephone circuits, or leased circuits that run through signal equalization equipment, or standard, flat modular telephone type cable, are not acceptable.

The RJ-45 connector on the Model 1092’s twisted pair interface is pre-wired for a standard TELCO wiring environment. The signal/pin relationships are shown in Figure 3 below.

	1	(N/C)
1	2	(N/C)
1	3	(N/C)
2	3	(N/C)
3	4	(Tip)
4

55 (Ring)

6	6 (N/C)
7	6 (N/C)
8	7 (N/C)

8 (N/C)

Figure 3. Model 1092 twisted pair line interface.

Proper 2-Wire Pairing between the two modems is as follows:

SIGNAL	PIN#	PIN#	SIGNAL
TIP	4 ----------------------------------------	4	TIP
RING	5 ----------------------------------------	5	RING

4.2 CONNECTION TO THE SERIAL PORT

The serial port interface on the Model 1092 uses interchangeable QuikConnect™ Modules. Each QuikConnect™ Module has a 50-pin card edge connector on one side and a serial port interface on the other. Figure 4 below shows how a QuikConnect™ Module plugs into the back of the Model 1092.

Line

Port

Interface

1	ON

0	OFF

Figure 4. Installation of Model 1092 Plug-in Serial Interface Module

4.2.1 Changing QuikConnect™ Modules

When you purchase a particular version of the Model 1092, it should be shipped to you with the appropriate QuikConnect™ Module already installed. If you need to install a different QuikConnect™ Module, follow these steps:

Removing the Existing QuikConnect™ Module

1)Turn the power switch off. Leave the power cord plugged into a grounded outlet to keep the unit grounded.

2)Loosen the two thumbscrews on the module by turning them counterclockwise.

3)Grasp the two thumbscrews and gently pull the module from the unit. Apply equal force to the thumbscrews to keep the module straight during the removal process.