Patton electronic MODEL 1075 Installation, Connection to the Twisted Pair Interface, Signal

3.2.4 Setting the JP1 Shield Strap

The setting of JP1 determines whether the shield (pin 1) of the

X.21 interface is connected signal ground. In the default setting, DB-15 shield is connected to signal ground. The X.21 shield is not connected to signal ground when the jumper is placed on pins 1 and 2 . See Figure 7, below.

		1
			Front
		2
			Rear
		3
	Figure 7. Jumper JP1 Orientation on the PC board
Jumper 1: DB15 Shield
Position			DB15 Shield
1-2			Not connected to signal ground
2-3			Connected to signal ground (default)

4.0 INSTALLATION

When you have properly configured the configuration switches and straps, you are ready to connect the Model 1075 to connect to your system. This section tells you how to properly connect the Model 1075 to the twisted pair.

4.1 CONNECTION TO THE TWISTED PAIR INTERFACE

The Model 1075 supports full or half duplex communication between two X.21 devices at distances to 6 miles (9.7 km) and data rates to 64 kbps. There are two essential requirements for installing the Model 1075:

1.These units work in pairs. Therefore, you must have one Model 1075 (or compatible unit) at each end of a two twisted pair interface.

2.To function properly, the Model 1075 needs two twisted pairs of metallic wire. These pairs 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, are not acceptable.

For your convenience, the Model 1075 is available with two different twisted pair interface options: RJ-11 jack or RJ-45 jack.

4.1.1 Twisted Pair Connection Using RJ-11 OR RJ-45

The RJ-11 and RJ-45 connectors on the Model 1075's twisted pair interface are pre-wired for a standard TELCO wiring environment. The signal/pin relationships are shown below.

RJ-11	SIGNAL	RJ-45	SIGNAL
1	GND	1	N/C
2	RCV	2	GND
3	XMT	3	RCV
4	XMT	4	XMT
5	RCV	5	XMT
6	GND	6	RCV
		7	GND
		8	N/C

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