Mitel SX-200 Documentation page 726

SECTION MITL91 OS/91 1 O-096-SOO-NA
4.20
Trunk Card. The Trunk Card contains either two or four trunks
depending on trunk type (four CO trunks, two E&M trunks, or
two DID trunks). These circuits provide the interface between the PABX
and the Central Office or other PABXs. Each trunk circuit repeats dial
pulse signals from the speech path to the Tip and Ring and passes
DTMF signals directly from the speech path to the Tip and Ring for
outgoing calls. The busy switches on the trunk card may be used to
make a trunk continuously busy. If the trunk is in use when the switch
is set, the existing call is not disturbed, but the trunk is made busy as
soon as the call ends. The trunk may also be busied-out from the
Supervisor Console (see Figure 4-3).
4.21 SUPERSET 4 Line Card. The SUPERSET 4 set requires a SUPER-
SET 4 Line Card, which is not compatible with standard tele-
phone sets. The card contains eight separate line circuits with eight
LEDs indicating on-/off-hook conditions. The line circuits act as inter-
faces between the SUPERSET 4 sets and the system CPU (Central
Processor Unit). The system processor continually polls all line circuits
to determine calls for service, time updates, messaging, etc. No actual
dial signals are sent between the SUPERSET 4 set and the system, as
all communication is digitally sent. For further information, see Section
MITLg174-518-l80-NA.
4.22 Scanner Card. The basic function of the Scanner Card is to
sequentially scan each port (line, trunk, console, receiver) in
order to detect signals requiring processor action. If such a signal (e.g.,
off-hook from a line circuit) is detected, the scanner informs the
processor of the port involved. The processor then takes over any
subsequent action required. Additional functions of the Scanner Card
include a 2-digit alarm display which identifies any malfunctioning
card, the master reset button and a data speed (300 or 1200 baud)
selector switch for the RS-232 interface. There is also a set of switch-
es to set the character length, stop bits and parity. In addition to the
above, the relays for night service, and night bells 1, 2 and 3 are
located on this card (see Figure 4-2).
4.23 Tone Control Card. This card provides the tone generators for
dial tone, busy tone, reorder tone, ringback tone and miscella-
neous tone, along with two DTMF generators and two rotary dial
generators which are used by the diagnostic routines and the Supervi-
sor. The four thumbwheel switches used with the test line and pro-
gramming are a&o located on the Tone Control Card. In addition, the
circuits for Page 1 and Page 2 outputs, and the Music-on-Hold input
are located on this card (see Figure 4-2).
4.24 Console Control Card. The Console Control Card provides the
interface between the system and two consoles. Console Con-
trol Card Number 1 (position 17) is allocated to the Maintenance
Console Connector and the Supervisor Console Number 1 Connector.
Console Control Card Number 2 (position 16) is allocated to the Su-
pervisor Console Number 2 Connector. The card provides both voice
and data signals to and from each console (see Figure 4-2).
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