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2.3 FRONT PANEL Controls on the front panel consist of a POWER switch, a RESET button, and a MARGIN switch or jumper. The function and operation of the POWER and RESET controls are discussed elsewhere in this manual. The MARGIN switch or pin jumper is a power supply test/maintenance diagnostic aid and should be left in the NOM position at all times. The front panel contains indicators that monitor module performance and serve as an aid in fault isolation. The indicators consist of light emitting diodes (LED) and a 3-digit alphanumeric display. The LED indicators on the bottom left of the front panel give an indication of the power supply status and an indicator on the right center of the panel lights if a fan module fails. LEDs on each of the boards are used in conjunction with the alphanumeric display to isolate malfunctions on the boards. Further information on the use of the module indicators is located in Section 3 of this manual. 2.4 REAR PANEL The rear panel contains the I/O board chassis power cable, a 100-pin backplane breakout board, and a grounding lug. As shown in Tables 2-2 and 2-3, the I/O boards are installed in the chassis in the slot corresponding in number to the applicable board installed in the front of the module. All communication with the LCN or the Data Hiway is through the I/O boards. The coaxial cables that run to the boards are connected by a tee connector with the output side of the tee going to the next board (or to a terminating load on the last tee in a series). The I/O board coax connectors are marked A and B; make sure that the A cable connects to the A connector and that the B cable is connected to the B connector. Ribbon cables are used to connect to such items as the Winchester drive module. Other connectors, for example RS-232C or RS-449 on the Computer Gateway, are also used. 2.5 FIELD ADJUSTMENT There are no field adjustments for the module. The LCN I/O (CLCN A/B for CE Compliant) board, however, has a module address jumper pack that must be characterized for the particular node address it occupies on the LCN. Refer to subsection 8.1 of the LCN System Installation Manual for system pinning. 2.6 EPDGP I/O BOARD PINNING The EPDGP I/O board, if present, has pinning options to set the default background shade for the CRT if a palette has not been set in a schematic (Set Palette is a new command in Release 320). You may find additional information on the Set Palette command in the Picture Editor Reference Manual in the Implementation/Engineering Operations - 2 binder. The EPDGP also has a configuration option that is set for either the Engineer’s Keyboard or the Supervisor’s Keyboard. (If both keyboards are installed, the EPDGP is set up for the Supervisor’s Keyboard, and the Engineer’s Keyboard is connected into the Supervisor’s Keyboard.) Figure 2-6 shows the keyboard and CRT background options for the EPDGP I/O.