Hardware
The serial link from the PBX is connected to the serial
port interface on the DMG1000, which is labeled
“DIAGNOSTICS”. When the DMG1000 is used in
serial protocol mode, this connector is used for the serial
link. Otherwise, the connector is used for
diagnostics/maintenance. The serial port has a female
DB-9 connector that enables connectivity to the PBX
serial interface. This permits bi-directional flow of call
information (for example, calling/called party and MWI
operational codes/responses) between the PBX and the
DMG1000. Table 1 shows the pin-out of the diagnostic
connector.
Note that a special cable may be required in order to
properly connect the DMG1000 to a serial switch inter-
face. If the PBX requires usage of serial control signals
(for example, CTS, CD), then some form of loopback
functionality will be required at the switch connector.
Consult the switch vendor’s documentation for the
required serial interface configuration parameter values
(that is, baud rate, parity, data bits, and stop bits) and the
serial port pin-out for the PBX. These configuration
parameters can be changed to match the switch on the
DMG1000’s system parameters web page in the serial
port group.
Theory of Operation
When a call arrives at a telephony port on the
DMG1000, the PBX will send a data packet across the
serial link containing the call party information associated
with the call. If configured to use the serial interface, the
DMG1000 will use the data in the serial packet as the
call party information when the call notification is sent
across the IP network to the VoIP terminal device for
which the call is intended. This data supersedes any call
information that may have arrived across the station set
interface. The serial protocols also support the MWI
feature that allows the DMG1000 to control MWIs on
subscribers connected to the PBX. In this case, message
waiting activation and deactivation notifications received
from the IP network (in the form of either SIP or H.323
VoIP protocols) will result in the appropriate packet being
sent across the serial link.
Master/Slave Mode
The PBX only provides a single serial link connection. At
a site where there are multiple DMG1000 units, only one
of the units can be physically connected to the PBX serial
link. This unit is the serial protocol master DMG1000;
the remaining units are considered serial protocol slaves.
Figure 2 shows how multiple DMG1000s connect to pro-
prietary PBX switches that use a serial link to provide call
party information. It is the responsibility of the master
gateway to send all serial link data to the slave gateways
across the IP network. Similarly, any time a slave gateway
needs to communicate to the PBX across the PBX’s serial
link, the slave gateway sends the data across the IP link to
the master gateway, which then sends the data across the
serial link. Figure 2 shows a typical device topology for
several DMG1000s in a master/slave serial integration.
Dialogic
®
1000 Media Gateway Series Serial CPID Configuration and Timing Application Note
3
Pin Description
1 Not used
2 Transmit
3 Receive
4 Not used
5 Ground
6 Not used
7 Not used
8 Not used
9 Not used
Table 1. Serial Pin-out of the DMG1000 Diagnostic Connector
9086-02_DMG1000_CPDI_Config_an.qxd 6/13/07 2:04 PM Page 5
(168 stránky)
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