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Two quantifiable components of scalability exist in reference to softswitch. They are the number of ports (DS0s) supported and the call-processing power. If these softswitch components are to overcome the objections of service providers, softswitch solution vendors must increase the density of their media gateways and boost the call-processing power of their softswitch solutions. Since 1998, the industry has progressed in the direction of ever-denser media gateways and efforts to manage super nodes where media gateways can be clustered to offer upper-end scalability comparable to that of the Class 4 or 5 switch. Considering that Netrix Corporation offered one of the densest gateways on the market in 1998 with 168 DS0s, it is clear that media gateways can exceed Class 4 or 5 in scalability per 7-foot rack.
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Table 6-1 Media gateways offer greater density in one 7-foot rack than Class 4
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Media gateway Cisco MGX8260 Convergent Networks ISC2000 Sonus GSX9000
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Density (DS0s/7-foot rack) 16,000 109,000 24,000
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Softswitch: More Scalable Than CLASS 4 or 5
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Softswitch is smaller than Class 4 or 5 in its footprint (smaller size and shape). As illustrated in Figure 6-2, softswitch requires less physical space to deliver the same port density, that is, the equivalent number of phone lines, as Class 4 or 5. Depending on the configuration, a softswitch may take as little as one-thirteenth of the space required by Class 4 or 5 to perform the same scale of service. This is a powerful advantage for softswitch. Due to the smaller footprint, softswitch power consumption and cooling requirements are also less than the legacy switches. Smaller hardware size also translates into lower real estate expenses. One comparison is a softswitch solution from Convergent Networks. Their product can concentrate over 100,000 DS0s in one 7-foot rack consuming a 24-inch 24-inch space, with space to access the switch, for a billable total of 12 square feet per month. A Class 4 in comparison delivering 24,000 DS0s requires 13 racks for a total of 156 square feet at $35 per square foot of central office space per month. The softswitch in this example offers a 92 percent cost saving over the Class 4 in real estate costs.1 The miniaturization of Class 4 components will not soon match the advantages of softswitch in footprint. The smaller footprint of the softswitch translates into lower real estate costs for the service provider. Although this
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Figure 6-2 Footprint comparison of Class 4 or 5 switches and a highdensity Voice over IP (VoIP) media gateway
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Billable space necessary to house 13 racks (36,000 DS0s) for Class 4 156 sq.ft.
Space necessary to house 1 rack (36,000 DS0s) for Softswitch - 12 sq. ft
Convergent Networks. A Business Case for Next-Generation Switching: Revolutionizing Carrier Revenues and Returns. www.convergentnet.com.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Softswitch: More Scalable Than CLASS 4 or 5
Softswitch: More Scalable Than CLASS 4 or 5
may not be a major concern for an incumbent provider who has built and paid off its central office facilities, it is critical for a new market entrant or an incumbent expanding into new markets. Figure 6-2 illustrates the financial advantages in rent or real estate concerns relative to the smaller footprint of softswitch. Scaling up a media gateway is a factor of hardware and software. A highdensity design consists of call-processing modules, PSTN interface modules, and packet interface modules. The packet interface modules provide the interface to the packet-switched network. Packet interfaces include DS-3, OC-3 optical interfaces, multiple 100 BaseT, and Gigabit Ethernet interfaces. DS-3 (672 DS0s)/OC-3 capacities are relatively recent improvements in the upward scalability of media gateways. Table 6-1 and Figure 6-3 illustrate the progression of media gateways (and softswitch solutions) in port density. The switch fabric module of a media gateway performs the routing of packets through the system. Line cards fill out the appropriate header
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