Patton electronic 2450 Line Network Connection, Connecting Over Private Twisted Pair, Signal PIN#

Switch S1-6: Front Panel Switch Enable/Disable

Switch S1-6 determines whether the front panel switches may be used to perform diagnostic functions.

S1-6	Activation	Description
Off	Enabled	Front panel switches may be used
		to activate/terminate diagnostics
On	Disabled	Front panel switches will have no
		effect on operation of the unit

Switch S1-7: DTE Loop Request Line Enable/Disable

The setting for switch S1-7 determines whether the DTE signals can be used to activate/terminate the loopback diagnostic modes and BER test patterns.

	DTE TM Line
S1-7	Activation	Description
Off	Enabled	DTE Loop request line switches
		may be used to activate/terminate
		diagnostics.
On	Disabled	DTE loop request lines will
		have no effect on operation of
		the unit.

Switch S1-8: Receive RDL Enable/Disable

Switch S1-8 determines whether or not the unit will respond to loop requests from the remote device.

S1-6	Activation	Description
Off	Enabled	Unit wil respond to loop requests
		from the remote device.
On	Disabled	Unit wil ignore loop requests from
		the remote device.

4.0 INSTALLATION

The Model 2450 is designed for 4-wire, full duplex communication over a DDS or Clear Channel carrier circuit, or over dedicated twisted pair. This section will describe proper connection of the line interface, the DTE (terminal) interface, and the AC power supply.

4.1 LINE (NETWORK) CONNECTION

The RJ-48S port on a Model 2450 CSU/DSU is prewired for a standard TELCO wiring environment (see Figure 4, below). Connect this port to the RJ-48S jack provided by your digital service carrier using a straight through twisted pair cable between 19 and 26 AWG. To be sure you have the right wiring, use the table below as a guide.

	1	(TX+)
1	2	(TX-)
	3	(N/C)
2
3	4	(N/C)
4	5	(N/C)
5
6	6	(N/C)
7
8	7	(RX+)
	8	(RX-)

Figure 4. Interface pinouts for Model 2450 RJ-48S jack.

4.1.1 CONNECTING OVER PRIVATE TWISTED PAIR

If you are using a pair of Model 2450s as short range modems over private twisted pair, make the connection between them using a twisted pair crossover cable pinned according to the diagram below.

	RJ-48S Cable (4-Wire)
SIGNAL	PIN#	PIN#	SIGNAL
TX+	1-----------------------	7	RX+
TX-	2-----------------------	8	RX-
RX+	7-----------------------	1	TX+
RX-	8-----------------------	2	TX-

7 8