Dialogic 1000Series, User Manual

Page: 29 / 326

Dialogic
®
1000 and 2000 Media Gateway Series User’s Guide 29
Overview
The switch only provides a single serial link connection. At a site where there are multiple Media
Gateway units, only one of the units can be physically connected to the switch or PSTN serial link.
This unit is the serial protocol Master Media Gateway while the remaining units are considered
serial protocol slaves. Figure 4 shows how multiple Media Gateways connect to a switch or PSTN
that uses a serial link to provide call party information. It is the responsibility of the Master
gateway to send all serial link data intended for Slave Gateways to the Slave Gateways across the
IP network. Similarly, anytime a Slave Gateways needs to communicate to the switch or PSTN
across the serial link, the slave unit sends the data across the IP link to the Master Gateway. The
Master Gateway will then send the data across the serial link on behalf of the slave device.
Figure 4. Multiple IP Gateways Using Serial Link
The Media Gateway supports the following serial protocols:
•
SMDI (Simple Message Desk Interface)
•
MCI (NEC Systems only)
•
MD110 (Ericsson Systems only)
Digital PBX
Media Gateway
(Phone Emulating)
VoIP
Terminal
Device
VoIP
Terminal
Device
1 - 8 Phone Lines
or 1 - 4
T1/E1 Lines
LAN
Serial Link
Media Gateway
(Phone Emulating)
1 - n Phone Lines
or T1/E1 Lines
Master Gateway
Slave Gateways
PSTN
Note: The T1/E1 Models must only be connected to
the PSTN through an NTU, CSU or other
device that provides line isolation.
Note: Only the Analog and T1/E1 Models
can connect to the PSTN.