ND-20292
CHAPTER 5
APRIL, 1990
Five types of resets are recognized:
Tl Occurs the first time the system is turned
on.
T2
T3 Occurs during subsequent power failures.
occurs when the CPU recognizes a system
error (abnormal reset).
5. Port Information (Memory Block lE5):
The number of port data communication (PAW,
PRW) errors for each port is stored (up to 99
errors) and can be retrieved from system
programming mode.
T4 Occurs when the CPU reset button is NOTE:The error count stored in each Memory Block
depressed. can be cleared.
T5 Occurs when a first or second initialization
is performed from a programming station. 550.2 Maintenance Function
2. System Program (ROM) Check (Memory Block
5B2):
Program (ROM) errors can be-retrieved from the
system programming mode for each of the five
program sections. The system performs daily
checksums for each of the program sections and
increments a peg count (up to 255) if problems are
found.
Forced Initialization (Reset Memory Blocks 3D1,
3D2,3D3 and 3D4) - In case certain troubles occur
in the system, normal system operation may be
restored by resetting the system or a particular
interface ETU or Multiline Terminal from the
system programming mode.
Software/Hardware Status Check
A. Interface ETU (Memory Block 5B5) -
3. Interface Slot Check (Memory Block 5B3):
The number of hardware communication errors
for each interface ETU (ESI, SLI, COI, TLI, ECR,
MFR, CNF AND VMI) can be retrieved from
system programming mode. Each card is checked
at 32 millisecond intervals and up to 255 errors
can be shown. Every time the busy switch on an
ETU is switched OFF, the corresponding error
count is incremented by one.
Software/Hardware information of each slot is
displayed.
B. Terminal (Memory Block 5B6) -
Software/Hardware information of each
terminal is displayed.
Data Dump Read Only (Memory Block 5C2) - RAM
and ROM data can be examined in increments of 1,
4,6 or 8 bytes at a time.
4. Terminal Check (Memory Block 5B4):
The number of hardware communication errors
for terminals connected to an ESI-E ( ) ETU can
be retrieved from the system programming mode.
Each terminal is checked at 32 millisecond
intervals and each time a particular terminal is
disconnected, the corresponding error count is
incremented by one to a maximum of 255 errors.
1.
2.
3.
4.
5.
System Data Change History (Memory Block 5Cl)
When the system program is altered, the last
change made and the date and time at which it
occurred is stored in system memory and can be
retrieved from system programming mode.
Busy Out/Restore - In case trouble does occur in the
system, the defective device(s) (interface card,
MFR channel or terminal) can be disabled from the
system programming mode.
500-4