TETRATAC NMS - Sirya User Guide Tetratac network description
BS and SCN are connected via MSN100 that is the element predisposed to network interface or alternatively directly by E1 interface. SCN utilizes the following links: •
One link (ISDN type) to MSN100 via Q.SIG protocol used to extend Tetra functionality towards other Clusters. In the previous figure is called E1 Extended;
•
One link to MSN100 providing interconnections between Home and Regional inside Clusters, and remote Base Stations. Used also for synchronization (2MHz clock rate);
•
One link (Ethernet type) to local management sub-system.
The E1 extended interface amongst the MSN100 gateway element and the SCN TETRA switch has been developed to extend the basic services of E1 interfaces beyond the gateway interfacing point. This important facility will be explained into paragraph related to the “Multiple TETRA Networked System”. MSN100 allows connection between BS and SCN by E1 link as shown in previous figure; moreover it’s an interface to connect system to Backbone and to external data / telephone networks. Configuration of TETRA network for this project will be described in next chapter. In stand alone mode the system can be used as a: •
A single site system with 4 carriers
•
A two sites system with a local BS of 2 carriers and a remote BS of 2 carries more (Kit Split option required)
MSN
MSN
RBS TSU
TSU
4 carriers Local BS
Single system Fig. 2.2:
MSN
TIU
TIU
SCN
Any transmission media with at least 128kb/s (Typical Radio Relay)
SCN
RBS BS
RBS
2 carriers Local BS
2 carriers Remote BS
Two sites split system
Stand Alone Mode
In any case interface towards external networks are provided on SCN rack through MSN. In the following table available external interfaces on SCN-MSN are listed:
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