By Gerhard Rufa
This ebook summarizes vital advancements in telecommunications, together with SS7 over IP, with a spotlight on SS7 community reliability.
But why is SS7 community protection and reliability so vital? An SS7 community outage leads to a breakdown of the signalling among the person nodes of the community, in order that the companies of the telecommunication community are not any longer to be had for purchasers. except the great monetary harm to the community operator, the social results of any such community breakdown can't be underestimated.
It is proven that the issues could be refrained from by means of compatible community making plans, i.e., through assuring bidirectionality, loop-freeness, and adequate node disjoint routes, or the creation of recent transmission and switching applied sciences in line with ATM and IP networks.
The booklet is written for non-SS7 specialists and attempts to supply extra specified historical past wisdom in regards to the SS7 community protocols, the issues, and their resolution in the course of the specification work.
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Extra info for Developments in Telecommunications: With a Focus on SS7 Network Reliability
A route set congestion, due to which the flow control measures are started. If, according to this philosophy, a User Part is congested the reception of MSUs from Level 3 is reduced or stopped. As a consequence, Level 3 becomes congested so that the reception of MSU from Level 2 is reduced or stopped causing a Level 2 or route set congestion, which leads to a load reduction at the originating signalling points. During the Blue Book study period, however, it was recognized that this philosophy does not work.
2, a signalling gateway (SG) is an IPSP equipped with both traditional SS 7 links and IP-based links. When the M2PA is used, the transition between the SS 7 network and the IP network domain is performed via the MTP-3 at the SG, which acts as an STP. , global title translation (GTT), the SCCP can be present in the SG. STPs may or may not be present in the SS 7 route between the SS 7 SEP and the SG. Since the IPSP contains the MTP-3 layer the IPSP must be represented by an SS 7 signalling point code, according to the MTP specification.
Nevertheless, both alternatives are problematic for the following reasons. On the one hand, if the user messages are not discarded, Level 3 and/or signalling route set congestion is created for all route sets via the considered exchange. Because of the large amounts of TFC messages created the local problem may spread throughout the surrounding network. In addition, traffic streams will be reduced that are not destined for the unavailable User Part. , the specified emergency procedures are started and unnecessary information of the management is performed.