vb.net barcode generator Specifications for Softswitch Reliability in Software

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Specifications for Softswitch Reliability
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No readily accepted industry standards exist for softswitch design and performance. As mentioned in Table 7-3, a Telcordia specification is available for packet-switched systems: GR-1110-CORE. It maps the reliability met-
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Softswitch Is Just as Reliable as Class 4/5 Switches
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Softswitch Is Just as Reliable as Class 4/5 Switches
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Softswitch Product Performance in Reliability
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Figure 7-6 Softswitch now meets the reliability of a Class 4 switch (Source: Data sheets from softswitch vendors).
Class 4 Call reliability
Softswitch reliability
Year Table 7-3 GR-1110 downtime specifications
GR-1110-CORE reliability parameter Core system downtime Individual port interface downtime Multi-interface downtime
Downtime (minutes/year) 0.4 12 1.2
rics defined in the circuit-switch specifications and applies them to the packet-switched industry. Key measures include the following:
Total service downtime The expected long-term average annual time spent in failure mode (due to hardware failures and operations, administration, and maintenance [OA&M] activities) that affects all services.
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Softswitch Is Just as Reliable as Class 4/5 Switches
7
Individual interface downtime The expected long-term average annual time spent in failure modes (due to hardware failures and OA&M activities) that affects one interface (DS-1, DS-3, or OC-12, and so on). The allowed time is 12 minutes per year. Multiport interface downtime The expected long-term average annual time spent in failure modes (due to hardware failures and OA&M activities) that affects two or more interfaces on a card (DS-1, DS-3 or OC12, and so on). The specification defines this time to be 1.2 minutes per year.
GR-1110 is ATM-centric and makes no specific mention of IP. The PacketCable standards provide a reliability model for VoIP with a cable slant. By using many of the mechanisms that Class 4 and 5 switches have utilized over the years (redundancy, fault tolerance, and NEBS) to achieve five 9s of reliability, softswitch is achieving the same levels of reliability. Given the declining costs of computing power, it is possible that softswitch may even exceed five 9s of reliability while remaining economically competitive to a Class 4 solution (see Table 7-4 and note the reliability figures.). Distributed architecture can also improve the reliability of a softswitch solution. With distributed architecture, no SPOF exists on a network. Any redundant component on the IP network can pick up where the primary
Table 7-4 Comparing softswitch products to Class 4 switches
Vendor and product Nortel DMS-250 (Class 4) Lucent 4ESS (Class 4) Convergent ICS2000 (Softswitch) SONUS GSX9000 (Softswitch) Nuera Nu-Tandem (Softswitch)
DS0s/ rack 2,688 BHCAS 800,000 Reliability 99.999 NEBS3 Y MOS 4.0
Price per DS0 $100
2,688
700,000
$100
108,864
1,500,000
24,000
2,000,000
480,000
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Softswitch Is Just as Reliable as Class 4/5 Switches
Softswitch Is Just as Reliable as Class 4/5 Switches
SS7 Gateway Chicago
Figure 7-7 Distributed architecture provides greater survivability/reliability over the centralized architecture of the PSTN.
Media Gateway Controller Denver with mirror site in Seattle SS7 IP IP Network IP
Media Gateway Seattle IP
Media Gateway Washington, D.C.
Application Server Los Angeles
Media Gateway Dallas
component failed. Figure 7-7 illustrates a dispersal of softswitch components around the United States. If a media gateway controller (MGC) in Denver is destroyed in a force majeure, another media gateway controller can pick up where the Denver MGC failed.
Software Reliability Case Study Cisco IOS
Software failures are perhaps the most difficult sources of failures to get out of any system. As software gets more complex and hardware more reliable, software-related outages might become more frequent, though more sophisticated software development, testing, and debugging techniques would try to counterbalance this effect. A typical strategy is to improve software testing and provide software resilience with a redundant set of software running on duplicated hardware. The important point is that the redundant software should not be processing the same inputs as the failing software at any point in time. In the case of convergence products, protection against software/hardware failures can be categorized as warm or hot,
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