User manual

MX-ONE SYSTEM DESCRIPTION
62 21/1551-ASP 113 01 Uen N2 2014-01-28
5.1.10.8 Tone Receiver/Sender and Conference Functions
The purpose of the tone receiver or sender function is to send out and
receive tone messages, such as dial tone, busy tone, congestion tone
and DTMF tones. The function is required for extensions, trunk calls and
conference calls.
The TMU provides the function of tone/DTMF receiver, tone/DTMF
sender, and conference functions. The TMU can be initiated to handle
A-law or mu-law PCM. The SPU4 board is a board that provides the tone
receiver function, used for DTMF detection from mobile extensions.
MX-ONE Lite and MX-ONE Classic, equipped with MGU, have the
DTMF receivers built-in on the MGU.
MGU has built in TMU functionality that cover most traffic cases. To get
TMU functionality for the special cases, described earlier in this docu-
ment, and to get external Music on Hold connections, TMU board must
be added.
5.1.10.9 VSU
The VSU, Voice Storage Unit, is required only when Recorded
Announcements are needed in a Media Gateway Classic equipped with
LSU-E, and there is no MGU in the system, or when the MGU(s) cannot
handle the needed RVA capacity.
MGU and EMG have built-in Recorded Announcement resources. A
Media Gateway Classic with LSU-E can 'borrow' RVA resources from an
MGU (but not from EMG).
5.1.10.10 MFU
The MFU is used for MFC signaling. Eight senders and eight receivers
are handled by the board.
5.1.10.11 DC/DC Converter
The DC/DC converter is required in all media gateways used with
MX-ONE Classic. The DC/DC converter provides the power voltages,
+/- 5 V; +/-12 V to all device boards through the backplane. One DC/DC
board is used per subrack.
• Input voltage range: -42 to -56V uninterrupted
The DC/DC converter is also provided with an alarm input interface,
which connects external alarms A and B to the backplane.