AT&T DEFINITY 555-230-223 - Manual (Page 123)

Maintenance
Table 4-2. System States (continued)
faceplate panel LCD
3. Read/Write functions — Lists byte-, word-, and long-
address values.
4. Additional tests — Lists diagnostic tests. These are also
shown on the faceplate panel LCD
5. Automatic boot — Brings up the system from a shutdown
mode, showing initialization operations and tests.
6. Preempt automatic boot — Ensures that all initialization
operations and tests will pass.
7. Manual boot — Allows a boot to be done manually from
the faceplate panel. Shows initialization operations and
tests.
8. Board commands — Provides board reset or shut down
options.
9. Quit and automatically boot — Allows the technician to
leave the command menu. Automatically boots the
system.
OS Displayed only when a TSC engineer interrupts the normal
initialization sequence. The operating system remains on-line,
but the DEFINITY LAN Gateway software is off-line. Used to
perform system diagnostics and repair using the factory or
supplied system operation tools. The customer does not have
access to this state.
INST Displayed during an upgrade or installation. Goes into this state
when the technician gets into the command mode by pressing
CTRL C twice and then preempting an automatic boot from the
command menu.
Figure 4-3, System Initialization and Shutdown Flow, shows the steps the
DEFINITY LAN Gateway system automatically takes from a dead state to full
operation. It also shows the states that can be entered whenever errors occur, or
when the technician manually changes states using the faceplate panel or with
the maintenance screens located in Chapter 3. Note that the states are shown
as they appear on the faceplate panel LCD.
4-8 Issue 1 January 1996