CHAPTER 2. OfficeServ 7400 Hardware
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2.3.5 Voice Application Module
This section describes the interface module using Digital Adaptor for Subscriber Loop
(DASL) to send/receive voice to/from the phone system and wireless base station. It con-
verts voice to data and sends/receives the data.
2.3.5.1 MGI
The Media Gateway Interface (MGI) module converts voice to data and sends/receives the
data via the data network. The MGI offers up to 16 channels and decompresses voice using
G.729, G.723, G.726, and G.711.
Main Functions
The main functions of the MGI voice application module are as follows:
y
Voice decompression: G.729, G.723, G.726, G.711
y
Facsimile relay: Provides two facsimile channels and four voice channels per module
(two channels per module)
y
Echo cancellation
y
Volume adjustment (-30~+30 dBm)
y
Silence suppression
MGI2D Optional Module
The MGI2D option module can be mounted on the MGI module to convert voice into
packets. Up to four MGI2D modules can be mounted. An MGI2D module processes four
channels, so the MGI module can process up to 16 channels of voice signals.
Front Panel
The front panel of the MGI voice application module is shown below:
Figure 2.18 Front Panel of MGI Module
RST
MGI
LAN
SIO
PWR RUN
LAN
TX
SVC
LAN
Rx
DSP RTPT RTPR
