vb.net barcode generator Softswitch meets or exceeds the performance parameters of Class switches in Software

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Table 15-1 Softswitch meets or exceeds the performance parameters of Class switches
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Vendor and product Nortel DMS-250 (Class 4) Lucent 4ESS (Class 4) Convergent ICS2000 (Softswitch) SONUS GSX9000 (Softswitch) Nuera Nu-Tandem (Softswitch)
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DS0s/ rack 2,688 BHCAS 800,000 Reliability 99.999 SS7 Y MOS 4.0
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Conclusion: Softswitch Will Conquer the World
Conclusion: Softswitch Will Conquer the World
Softswitch Meets or Beats PSTN Metrics of Performance
Table 15-1 compares legacy Class 4 switches against Class 4 replacement softswitches. The Class 4 replacement softswitches meet or exceed the performance parameters of the legacy Class 4 switches. These are the criteria that most service providers have for selecting new platforms. Softswitch architecture is more scalable than Class 4 at both ends of the spectrum. Some softswitch solutions can put 100,000 DS0s in one sevenfoot rack where a comparable Class 4 solution (Nortel s DMS-250, for example) requires over a dozen seven-foot racks to deliver the same density. More importantly, a softswitch solution is superior to a Class 4 switch, for example, in its ability to sale down rather than up. A softswitch solution can scale down to one DS0 in the case of an IP phone. The smallest scale of a DMS250, for example, is 480 DS0s. This gives a service providers greater flexibility in deployment to the markets served. Softswitch solutions are potentially more reliable than Class 4 or Class 5, which boast five 9s of reliability. This merely describes the switch only and not the Public Switched Telephone Network (PSTN) as a whole. VoIP is essentially a voice over a data network. Many are the data networks that are high availability (HA) with the five 9s. This describes the network as a whole and is not limited to one network element, the switch in this case. The PSTN as a network will never achieve five 9s as each central office, for example, constitutes a single point of failure (SPOF). As many subscribers found to their dismay on September 11, 2001, there is no back up to any given central office. Softswitch solutions potentially meet or exceed Class 4 and 5 in terms of QoS. The primary concern for service providers and subscribers is the need to match the voice quality of the PSTN, which rates a Mean Opinion Score (MOS) of 4.0. Some softswitch solutions exceed 4.0. To do this, service providers must engineer the latency of voice traffic to a level that meets or beats the PSTN. Multiple mechanisms can be engineered into an IP network to deliver adequate QoS, including Differentiated Services (DiffServ), Resource Reservation Setup Protocol (RSVP), and Multiprotocol Label Switching (MPLS). Components of a softswitch solution, such as media gateways, can also be engineered to minimize latency. Another objection to VoIP and softswitch solutions is the perception that softswitch solutions cannot deliver the 3,500 features of a Class 5 switch in North American markets. No service provider in that market needs to offer 3,500 features to any subscriber or market of subscribers. In the Class 5
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Conclusion: Softswitch Will Conquer the World
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market, a service provider can obtain new features only from the switch vendor. Historically, a service provider would have to spend millions of dollars and wait years for features to be delivered by their switch vendor. Softswitch solutions use open standards that allow the rapid creation and rollout of new features. These features can come from a softswitch vendor, a third-party software vendor, or the service provider can write the feature themselves. Service providers have also been concerned about interfacing IP networks and the PSTN, especially in regards to the flow of signaling between those two networks. The use of Signaling System 7 (SS7) is necessary for the delivery of features to subscribers. SS7 can be routed over IP networks using Signaling Transport (SIGTRAN) and other emerging mechanisms. It is possible that SS7 will be replaced by simpler, more efficient means of signaling such as Session Initiation Protocol (SIP).
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