User Manual
SUPM1
page 50 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
94
Functional Description
5.10 Signalling
5.10.1 Downstream PSTN Signals
The following PSTN signals towards the subscriber (downstream) are sup-
ported.
5.10.1.1 Ringing
Each subscriber line interface produces its own balanced ringing signal.
Accordingly, parallel ringing of all user ports is possible without restrictions.
On unit level select the ringing frequency 16 2/3, 20, 25 or 50 Hz according
to the network requirements.
5.10.1.2 Metering
On unit level configure the metering frequency 12 or 16 kHz according to the
network requirements.
On unit level configure the metering level 0.5, 0.9, 1.8, 2.4 or 3.0 V
RMS
(@
200 Ω) according to the network requirements.
Do not choose a level too high since this could cause a clipping in the voice
path of the terminal.
In the MCAS mode of operation the “pulse on answer” can be enabled or
disabled. Pulse on answer means that a metering pulse is sent to the sub-
scriber when the called subscriber goes off-hook
On unit level, advanced board parameters, the “Metering Pulse after On
Hook” can be configured. This timer defines the time a SUPM1 user port
may send out any metering pulses after the subscriber went on-hook. Also
the voice path remains transparent during this time.
It is recommended to set this parameter to a value between 1 and 5 sec-
onds.
5.10.1.3 Polarity reversal
Supported.
5.10.1.4 Pulsed no battery
The pulsed no battery signalling is supported in the V5CAS mode of opera-
tion only.
On unit level, advanced board parameters, the “Pulsed No Battery Wire
Selection” can be configured. The configuration defines the physical behav-
iour of a “pulsed no battery”.
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