Patton electronic 1070 Operation, LED Indicators, Loopback Test Modes, Local Analog Loop

5.0 OPERATION

Once you have properly configured and connected each Model 1070, simply plug in the AC power adapter to get them running; there is no power switch on the Model 1070. You can monitor the operation of the Model 1070 using the front panel LED indicators and built-in loopback test modes.

5.1 LED INDICATORS

The Model 1070 incorporates six front panel LEDs that show the status of the modem:

1.The power LED glows when AC power is applied to the modem.

2.The loopback test LED glows when the loopback test switch has been depressed and is in a test mode.

3.The tri-state TD and RD indicators blink red and green with data activity. Solid red indicates a low RS-232 logic level, and no color indicates no activity on the line. Note: RS-232 devices idle in a low state, so the LED will glow red if the connections are correct and the RS-232 device is in an idle state.

4.The RTS and CD indicators glow red for a "low" signal and green for a "high" signal. Note: RTS refers to the signal generated by the DTE on pin 4. CD refers to the signal generated by the Model 1070 on pin 8. It also indicates that a signal is being received by the remote modem.

5.2LOOPBACK TEST MODES

Selected the test modes by depressing the "Loopback Test" switch.

When in loopback mode, the "Loopback Test" LED will glow red. Two tests are possible using this switch: Local Analog Loop (LAL) and Remote Analog Loop (RAL).

5.2.1 LOCAL ANALOG LOOP

The first test mode is Local Analog Loop (V.54 Loop 3). Any data sent to the local Model 1070 in the this mode will be echoed (returned) back to the user device. For example, characters typed on the keyboard of a terminal will appear on the terminal screen (see Figure 6 on the following page).

5.2.2 REMOTE ANALOG LOOP

The second test mode is Remote Analog Loop. To enter this mode, set one of the Model 1070s (local) in test mode by depressing the "Loopback Test" switch. Any characters sent from the remote Model 1070 will be returned back to the originating device (see Figure 6). If no characters are echoed back, check the wiring between the two Model 1070s. Be sure to wire the units according to the instructions in Section 4.0 Installation.

			TX+			RX+	RD
TD			TX-			RX-
			RX-			TX-	TD
RD			RX+			TX+
		Local 1070				Remote
	In Normal Mode					1070RC
					In Normal Mode
				TX+		RX+	RD
TD				TX-		RX-
				RX-		TX-	TD
RD				RX+		TX+
		Local 1070				Remote 1070
	In Loopback Mode					1070RC
					In Normal Mode

Figure 6. Loopback Test Modes

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