Power-Up, LED Status Monitors, Diagnostics

5.0 OPERATION

Once the Model 1094 is properly configured and installed, it should operate transparently. This sections describes power-up, read- ing the LED status monitors, and using the built-in loopback test modes.

5.1 POWER-UP

Before applying power to the Model 1094, first be sure that you have read Section 4.3, and that the your power source matches the power rating shown on the bottom label of the Model 1094. Failure to do so could result in damage to the unit and connected equipment, and may constitute a fire hazard. If your Model 1094 is AC powered, plug the AC power cord into both the Model 1094 and the AC outlet. Then power-up the unit using the rear power switch. If your Model 1094 is DC powered, and has been connected to the DC power source according to the instructions in Section 4.3, turn on the DC power supply and then power-up the unit using the rear power switch.

5.2 LED STATUS MONITORS

The Model 1094 features seven front panel LEDs that monitor transmit data, receive data, request to send, carrier detect, data termi- nal ready, test modes and error conditions. Figure 4 (below) shows the front panel location of each LED. Following Figure 6 is a description of each LED’s function.

KiloModem PS High Speed Sync. Short Range Modem

							Test Modes
TD	RD	RTS	CD	DTR	ER	TM
						Local -	- 511E
						Normal -	- Normal
						Remote -	- 511

Figure 4. Model 1094 Front Panel

TD and RD Will glow red to indicate an idle condition of Binary 1 data on the respective terminal interface signals. Green indicates Binary“0 data.

RTS Will glow green to indicate that the Request to Send signal from the terminal is active.

CD Will glow red if no carrier signal is being received from the remote modem. Green indicates that the remote modem’s carrier is being received.

DTR Will glow green to indicate that the Data Terminal

Ready signal from the terminal is active.

ER Will glow red to indicate the likelihood of a Bit Error in the received signal. During the 511 or 511/E test, ER will flash to indicate that the Test Pattern Detector has detected a bit error.

TM Will glow green to indicate that the Model 1094 has been placed in Test Mode. The unit can be placed in test mode by the local user or by the remote user.

5.3 DIAGNOSTICS

The Model 1094 is equipped with three sets of diagnostics to eval- uate the condition of the local and remote units, as well as the twisted pair link between them: local analog loopback (LAL) and remote digital loopback (RDL) according to the CCITT V.54 Standard, and bit error rate BER test according to the CCITT V.52 Standard.

5.3.1 LOCAL ANALOG LOOPBACK (LAL)

The Local Analog Loopback (LAL) test checks the operation of the local Model 1094. Any data sent to the local Model 1094 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 ter- minal screen (see Figure 5, below).

Local 1094

1090

Figure 5. Local Analog Loop

To perform an Analog Loopback test, follow these steps:

A.Activate Local Analog Loopback. This may be done in one of two ways: First, by moving the front panel toggle switch UP to Local. Second, by raising signal LOCAL LOOPBACK on the terminal interface (for pin numbers, see Appendix D). Once LAL is activated, the Model 1094 transmit output is connected to its own receiver. The TM LED should be lit.

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