User Manual
SUPM1
page 35 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
94
Functional Description
5 Functional Description
This chapter gives the detailed functional description of the SUPM1 unit in
the XMC20 subrack.
5.1 V5CAS Mode of Operation
The V5CAS mode of operation is only applicable if the SUPM1 unit is con-
nected to the VOIP1 media gateway unit.
A PSTN subscriber accesses the SUPM1 unit with three different logical
channels:
• Analogue voice channel
• Inband PSTN signalling channel (e.g. DTMF dialling)
• Out of band PSTN signalling (e.g. off-hook)
The voice signal and the inband signalling are converted to/from the PCM
format by the codec and are cross connected to the VOIP1 unit.
The out of band signalling is converted to/from CAS (channel associated sig-
nalling) by the SLIC and also cross connected to the VOIP1 unit. This proto-
col running between SUPM1 and the VOIP1 unit is KEYMILE proprietary and
is called V5CAS.
Figure 8: V5CAS routing in XMC20
In the V5CAS mode of operation the
• Blocked port line feed function can be enabled or disabled.
• Metering pulse function towards the subscriber can be enabled or disa-
bled.
Note that the metering pulse and its timing is also controlled by the CPS.
This cannot be configured in the ECST.
• Pulse on answer function is enabled.
Pulse on answer means that a metering pulse is sent to the subscriber
when the called subscriber goes off-hook.
• Polarity reversal function towards the subscriber is enabled.
PSTN signalling and user por t
management function
&
connection control
DTMF
(inband
signalling)
Softswitch
Call control
tones
(inband
signalling)
Connection
control
TDM
Packet
PSTN signalling
(out of band ) to
V5CAS
PCM64 codec
(G .711 A -law)
Voice channel
(with inband
PSTN signalling )
PSTN signalling
(out of band )
SIP
RTP
packet
stream
MG
V5CAS
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