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DSI Signaling Server SGW Mode User Manual Issue 5

1.9.2 Configuration Model

MTP data messages are considered to arrive at either an MTP3 link set or an M3UA SIGTRAN link. The link

set or M3UA SIGTRAN link identifies the network and SS7 format of the message. MTP3 link sets can exist

above a TDM MTP2 signaling link or a signaling link utilizing a M2PA SIGTRAN link for communication over IP.

The decision as to how to process the data message is performed by the incoming route. The incoming

route is identified by the network and domain (either MTP or IP) from which a message arrives.

The incoming route then determines whether the message requires further analysis of the data prior to

destination selection by looking up a routing key table or whether a destination can immediately be

selected.

If the Signaling Gateway determines that a routing key table be looked up, the data from the data message

is compared with routing keys in a routing key table. If a match is found, and the destination for that routing

key is in service, that destination is used. Otherwise, if the incoming route also has a destination associated

with it, that default destination is used. If no routing key table is associated with it, the default destination is

used.

A destination can route a data message to either an Remote Application Server (RAS) or to MTP (MTP

over MTP2 or MTP over M2PA). Selection of whether MTP or IP routing is used is determined by the

availability of the data messages point code in the MTP or IP domain and whether MTP or IP has priority.

If MTP routing is selected, the data message is sent out on an MTP SS7 route that matches the point code of

the data message. It is possible to configure MTP3 with a default route for use when it is undesirable to

preconfigure all routes that are used.

See Chapter 7, “Configuration Overview” for a more detailed configuration discussion and Chapter 11,

“Worked Configuration Examples” for some examples.

1.9.3 Cross Connections

The Signaling Gateway allows you to set up cross connections (semi-permanent connections) between an

incoming timeslot on one PCM port and an outgoing timeslot on any PCM port. These connections can either

be simplex or duplex.

1.9.4 Monitoring

The Signaling Gateway allows you to monitor TDM signaling links by dropping a copy of the signaling to a

spare PCM port. This allows for a protocol analyzer to be left connected to one PCM port and gives you the

ability to control remotely which signaling links are monitored. Each monitored signaling link requires two

timeslots on the spare PCM port, one to monitor the send direction and the other for the receive direction.

1.9.5 Remote Data Centers

The Signaling Gateway supports the transfer of software updates, configuration files, alarm reports and

periodic measurements over Ethernet to/from a remote location, the Remote Data Center (RDC).

Multiple RDCs can be configured by specifying an IP address and a user name and password for the Signaling

Gateway to use to “logon” to the RDC.

Data transfer to the RDC uses the File Transfer Protocol (FTP).

Measurement reports are made on a configurable periodic basis.

Optionally, since it can be configured as an FTP server, the Signaling Gateway itself can be configured to act

as an RDC, thus allowing RDC operation to be performed locally on the Signaling Gateway itself.

See Chapter 9, “Remote Data Center Operation” for a more detailed description of the capabilities and

configuration of an RDC.

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