Trunk Release; Power Requirements; Power Supplies; Reserve Power Supply - Mitel SX-5 Manual

Trunk Release Reserve Power Supply
9.28
To release a trunk, the current loop must
9.32
If required, the SX-5 may be connected t o
be broken. The current loop is broken
a reserve power supply which will maintain
when
system operation for a minimum o f 45 minutes
(average two hours).
(al The extension goes on-hook The CPU de-
tects the on-hook and instructs the trunk
to remove the termination and break the
loop.
(b) The distant party goes on-hook (only when
the CO trunk is "ground start"). The CO
signals the extension that the distant party
tias gone on-hook by removing the ground
on the TIP lead The change in TipIRing
status is relayed t o the CPU on Ute data
bus and the call is released
(c) The trunk cable is physically broken If me
Grounding
9.33 The SX-5 should be grounded in accor-
dance with the grounding instructions con-
tained in CTIB-80-20- 1001200-00 1, Installation
Practices and Protection Techniques
10.
SIGNALING AND SUPERVISION
General
10.01
This part details the technical parameters
o f the SX-5
with
regard t o signaling and
supervisory conditions
loop is broken, the' loss o f loop current is
relayed t o the CPU on the data bus and the
Dial Pubes and DTMF Tones
call .is released
10.02 The SX-5 is capable o f accepting and re-
peating signals from telephone sets having
E . Power Requirements
the parameters given in Table 10-1, Dial Pulse
Limits and Table 10-2, DTMF Tone Limits
Power Supplies
10.03
The SX-5 provides the following signal
9.29 The primary power supply is 105-125
characteristics
Vac (optionally 230 Vac), 47-63 Hz The
internal power supplies, derived from the power
supply card, are -24 V
2
5% (460 mA), -8 V
+
5% (100 mA), +5 V
2
5% (250 mA) and +5
2
5%
(1 Amp). These values are chosen in order to
obtain the correct voltage on the devices, taking
into account voltage drops through the tracks
The maximum ripple level on the power supplies
are as follows:
2 5 mV peak-to-peak for -24 V
0.3
mV peak-to-peak for +5 V (250 mAl
1.5
mV peak-to-peak for +5 V ( 1 Amp)
Dial Pulse Conditions
-
Pulse rate
-
8 t o 1 1 pps
Break interval
-
5 8 to 64%
lnterdigit time
-
0.6 to
3 s
.
Rotary Dial Pulse-to-Oigit Conversion
10.04
A variety of encoding dialing systems are
used by different PTT administrations
These can be automatically adapted to, by means
o f an integrated code conversion facility. The
translation codes available are shown in Table
10-3. Refer to Mm9 103-098-205-NA, Prog-
ramming and Instailation Forms, for programming
9.30
The SX-5 power supply has an inherent
details
minimum holdover time o f 45 m s Thus the
maximum permitted length of a failure in the
~i~~~~~
F~~~~~~~~~~
primary power supply is 45 m s
10.05
The nominal ringing frequency o f 20 Hr
9.31
The SX-5 complies with the FCC Part 68
can be set t o 17.5 Hz. 20 Hz or 25 Hz
regulation governing surge protection
during the initialization of the system Refer t o
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