2.
Network
2)
Intercom call
-
Matrix: Single stage, non block-
ing C-MOS switch ar-
ray
Electronic circuit using
custom LSI (Equivalent
to 500 type standard
network)
-
Calling signal for
called station:
. Keyset network:
- Transmitter and
Receiver
:
Dynamic type
(Equivalent to 500 type
standard telephone
transmitter and
receiver)
3. Transmission
- Cross talk attenuation: More than 75 dB for
- Insertion loss,
station to trunk:
300-3, SOOkHz
Less than 1.8 dB at
IkHZ
140.9 Visual and Audible Indications
1. Visual
Lamp indications of a Keyset are as follows:
* Idle condition:
-
Busy CO/PBX and
intercom path:
-
Incoming CO/PBX and
intercom call:
* Call hold CO/PBX:
-
I-Hold indication
(CO/PBX):
* Hold reminder:
2. Audible Indication
I) CO/PBX call
-
Incoming call on
CO/PBX (idle):
*
Incoming call on
Not lit
Steady light
Flashing light at 601PM
Winking light at
‘120IPM
Intermittent wink light
Flashing light at
6OOIPM
483Hz/64SHz modu-
lated by lOHz, 1
sec.
ON/1 sec. OFF
1200Hz/580Hz
CO/PBX (Receiver off
hook):
*
Hold reminder: 1200Hz,
0.5 sec. ON/O.5 sec.
OFF
* Ringback tone:
-
Busy tone:
- Call waiting tone:
- Override tone:
-
Error tone:
* Store speed dial tone:
140.10 Dialing Spxification
1.
Dial Pulse Address Signalling
a) Pulse rate:
b) Percent break:
c) Interdigital interval:
2. DTMF Address Signalling
a>
Voice signaIling after
tone burst (580Hz,
0.75 sec.)
580Hz,O.75 sec.
580Hz,
0.5 sec. ON/OS sec.
OFF
1200Hz,
0.5 sec. ON/O.5 sec.
OFF
58OHz, 0.75 sec.
1200Hz,
0.25 sec. ON/O.25 sec.
OFF
580Hz
10 pps or 20 ppS
61 t 3 percent
800 msec.
Frequencies: Two sinusoidal signals,
one from a high group
of three frequencies
and one from a low
group of four frequen-
cies. 7
Nominal High Group
Frequencies (Hz)
1209 1336 1477
---
69J 1 2 3
Nominal 770 4 5 6
Low Group
Frequencies (Hz) 852 7 8 9
w*
0 #
Frequency deviation: Within * 1.5%
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