Multiple Ip Gateways Using Serial Link - Dialogic DMG1000 User Manual

For DMG1000 types, the serial link from the switch is connected to the serial port interface on the
DMG1000 (DIAGNOSTICS connector). Table 1, "DIAGNOSTICS Connector Pin Designations"
in the Getting Started Guide shows the connector pin designations.
For DMG2000 types, the serial link from the switch is connected to the serial port interface on the
DMG2000 (COM 1 or COM 2 connector). Table 4, "COM 1 and COM 2 Connector Pin
Designations" in the Getting Started Guide shows the connector pin designations.
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
PSTN
Digital PBX
®
Dialogic 1000 and 2000 Media Gateway Series User's Guide — September 2007
Dialogic Corporation
Note: Only the Analog and T1/E1 Models
can connect to the PSTN.
Serial Link
IP Media Gateway
(Phone Emulating)
Master Gateway
1 - 8 Phone Lines
or 1 - 4
T1/E1 Lines
IP Media Gateway
(Phone Emulating)
Slave Gateways
1 - n Phone Lines
or T1/E1 Lines
Note: The T1/E1 Models must only be connected to
the PSTN through an NTU, CSU or other
device that provides line isolation.
Overview
LAN
VoIP
Terminal
Device
VoIP
Terminal
Device
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