Mitel SX-200 Documentation page 723

SECTION MITL91
OS/91 1
O-096-500-NA
D. Dynamic Diagnostics
r
4.16
Each time an extension goes off-hook or a trunk rings in, it is
connected to a speech path. The Dynamic Diagnostics check
the speech path to ensure that the speech path connection is good. If
a bad path is detected, the processor assigns a new speech path and
rechecks the connections. If, after four attempts, the speech path still
tests bad, it is assumed that the test sequence is at fault and the
connection is maintained. The automatic diagnostics will detect any
bad speech path and raise the required alarm condition.
E. Circuit Cards
4.17
Both the SX-100 and SX-200 systems employ a minimum num-
ber of different types of cards (Figure 4-l), which may be used
in either system minimizing stocking and control problems for field
maintenance. The cards used in the system are described in the fol-
lowing paragraphs.
4.18
IPC Card.
This printed circuit card contains the system 32 k
Non-Volatile Random Access Memory. It is used for the storage
of customer configuration data (Class-of-Service options, numbering
plan, etc.) (see Figure 4-2). This card also holds four diagnostic LEDs:
1.
The top LED, when flashing, indicates that the automatic diag-
nostics are running. This LED will not flash (the diagnostics do
not run) when the system is in the programming mode, or when
less than four speech paths are idle. Under these circum-
stances, the LED may be either on or off; its state has no
special meaning.
2. The second LED, when lit, indicates that the system is in the
programming mode.
3. The third LED, when lit, indicates that the RS-232 port is in use.
4. The fourth LED, when lit, indicates that the system is function-
ing.
The IPC card contains the system Generic program in Programmable
Read Only Memory (PROM), and also contains the microprocessor,
which together with the Generic program constitutes the intelligence
of the system. The basic system clock is also located on this card (see
Figure 4-2).
4.19 Line Card. The Line
Card contains eight separate line circuits.
The line circuit detects on- and off-hook conditions, which are
recognized by the scanner and reported to the processor for appro-
priate action. Dial signals (rotary dial or DTMF) are passed to a receiver
over the speech path selected for the conversation (see Figure 4-2).
This card is not compatible with the SUPERSET 4 telephone sets.
Page 18