User manual

MX-ONE SYSTEM DESCRIPTION
60 21/1551-ASP 113 01 Uen N2 2014-01-28
5.1.10 Boards and Functions in MX-ONE Media Gateways
This chapter gives a general description of functions provided by the
following MX-ONE media gateways: (please note that MX-ONE Slim
does not have any slots for device boards. Functionality realized with
such boards are not applicable for MX-ONE Slim)
•MX-ONE Lite
• MX-ONE Slim
• MX-ONE Classic
• Media Gateway Classic equipped with LSU-E (not for new deliv-
eries).
This chapter is not valid for EMG.
5.1.10.1 VoIP Traffic
The media gateways convert the RTP streams to TDM data, and TDM
data to RTP streams. The conversion is used for gateway calls where
the media streams are handled by a media gateway. For the RTP
packet, G.711, G729A, G729B or G.729AB speech codec are supported
with 30 ms packet lengths. The speech cadets can be changed in steps
of 10 ms. Voice Activity Detection (VAD) and Comfort Noise Generation
(CNG) are supported and can be enabled per call. Adaptive jitter buffer
is also supported for a maximum of 240 ms buffer length. The buffer is
configurable and allocated on a per call basis.
5.1.10.2 Echo Cancellation
MX-ONE media gateways supports echo cancellation complying with
ITU-T G.168 standard. The echo canceller is used for the VoIP traffic.
The echo cancellation algorithm manages up to 128 ms tail length.
5.1.10.3 Analog Interfaces
The ELU34 provides 32 extension lines for analog extensions. The
extension lines carry speech signals, DTMF signals, and voice-band
analog functions. The ELU34 board also provides DC feeding, loop
detection, ground key detection, ringing trip detection, ringing voltage
generation, and call metering functions. The ELU34 can be adapted for
different market requirements and for ringing signals superimposed on 0
V or -48 V. The board consists of the analog extension line interfaces,
two DC/DC converters, one ringing voltage generator, and one control
part. The analog interface supports Calling Line Identification Presenta-
tion (CLIP and CLIR), which means that the phone number, for incoming
calls, is presented on the display of the called party's terminal. The