Front Panel Switches, Test Modes | Patton electronic RS-232 specification

5.0 OPERATION

Once the Model 1035 is properly configured and installed, it should operate transparently—as if it were a standard cable connection. Section 5.0 describes reading the LED status monitors, powering-up and using the built-in V.52 and V.54 test modes. The Model 1035 is powered by a 7.5V DC external wall mount transformer. To power up the unit, connect the power supply cord to the power jack on the rear of the Model 1035 and plug the power adapter into the wall. There is no ON/OFF switch.

5.1 FRONT PANEL SWITCHES

During normal operation, both front panel switches should be in the “normal” center position. To operate a test mode, see Section 5.3.

5.2 LED STATUS MONITORS

The Model 1035 features five front panel LEDs that monitor transmit data, carrier detect, two test modes and power. Figure 6 shows the front panel location of each LED. Following Figure 6 is a description of each LED’s function.

BERT LOOP	511/E RDL	NORMAL 511 LAL
PWR	TD	CD

Figure 6. Model 1035’s LED indicators and test switches

PWR = Glows green when the Model 1035 is powered up. TD = Glows red for a “space” on transmit data.

CD = Glows red for high on carrier detect.

BERT = Glows red when bit errors occur in test mode (511 pattern);

Lights when 511/E test pattern has been selected.

LOOP = Glows red when the Model 1035 is in remote digital loopback or local analog loopback mode.

5.3 TEST MODES

The Model 1035 offers two V.54 test modes to evaluate the condition of the modems and the communication link. These tests can be activated physically from the front panel, or via the interface. Note: V.54 test modes on the Model 1035 are available for point-to-point applications only.

5.3.1 Local Analog Loopback (LAL)

The Local Analog Loopback (LAL) test checks the operation of the local Model 1035, and is performed separately on each unit. Any data sent to the local Model 1035 in this test 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. To perform a LAL test, follow these steps:

A.Activate LAL. This may be done in one of two ways: First, by moving the front panel toggle switch DOWN to “LAL”. Second, by raising pin 18 on the interface. (Note: Make sure DIP switch SW1-8 is OFF). Once LAL is activated, the Model 1035 transmitter output is connected to its own receiver. The “test” LED should be lit.

B.Verify that the data terminal equipment is operating properly and can be used for a test. If a fault is indicated, call a technician or replace the unit.

C.Perform a BER (bit error rate) test on each unit. If the BER test equipment indicates no faults, but the data terminal indicates a fault, follow the manufacturer’s checkout procedures for the data terminal. Also, check the interface cable between the terminal and the Model 1035.

5.3.2Remote Digital Loopback (RDL)

The Remote Digital Loopback (RDL) test checks the performance of both the local and remote Model 1035s, and the communication link between them. Any characters sent to the remote Model 1035 in this test mode will be returned back to the originating device. For example, characters typed on the keyboard of the local terminal will appear on the local terminal screen after having been passed to the remote Model

1035 and looped back. To perform an RDL test, follow these steps:

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