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sarily for data SONET also wastes capacity in the backup ring See 8 for more efficient (although admittedly less proven) alternatives to SONET An assortment of techniques are evolving to speed reconvergence in IP networks These techniques may be pure IP, such as equal-cost load sharing or quasi-static routes, or may involve alternate MPLS paths
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Many aspects go into the process of supplier selection by service providers These include the characteristics of working with the supplier, the characteristics of the equipment, and the nature of operating and maintaining the equipment
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Enterprises often stress using a single vendor to whom they can outsource operations, or which at least can provide them a single equipment vendor with whom to speak Carriers have a somewhat more pessimistic tradition in which they prefer not to have a single vendor for any given critical function Part of the philosophy of carrier grade is psychological, taking ultimate responsibility for availability The reality is that any vendor, no matter how competent, will have hardware or software bugs that only appear in operations AT&T and MCI both have had national frame relay outages caused by bugs in Lucent/Ascend and Cisco switches I m not singling out these switch vendors, who make excellent products Service providers will want to know how the vendor provides technical support, both in a proactive and reactive mode Proactive technical support includes resources for planning and implementing new installations and upgrades It may include a continuing relationship in which the provider sends operational statistics to the vendor and receives advice on potential reliability and capacity issues Reactive technical support includes whatever is needed to solve problems
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Providers will look at both hardware and software aspects of the vendors products From a business standpoint, this examination will include initial costs of both purchase and implementation, as well as the continued cost of vendor maintenance, staff training, and spare parts From an operational standpoint, the provider wants realistic estimates of downtime, which can be caused by inservice upgrades, failures, and preventive maintenance Diagnostics both hardware and software also are important capabilities, along with problem reporting and bug tracking
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Another aspect of carrier grade is called once up, always up in telephony This aspect includes the idea that cards, power supplies, and other electronics, including control processors, can be maintained or replaced without impacting the overall network element At the level of circuit cards, rational layout of their cabling can be as operationally important as the card electronics A hotswappable card that cannot be swapped without disconnecting a cable to seven cards unrelated to the problem is not carrier-grade Common components such as management processors and power supplies must be redundant and hotswappable In the real world, many network elements have some parts that cannot be replaced transparently, such as the backplane or midplane Designers work hard to limit such parts to functions that are unlikely to need field maintenance, and try to remove the single points of failure Even single points
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NETWORK EQUIPMENT BUILDING SYSTEMS (NEBS) NEBS establishes the physical environment in which a component is expected to work, ranging from temperature and humidity to heat dissipation to electrostatic discharge There are three increasingly stringent levels of general NEBS requirements, and four levels of earthquake protection Meeting NEBS level 1 does not so much speak to the reliability of the network element as much as it ensures that the element does not interfere with other equipment in a carrier facility Its focus is on safety and electromagnetic emissions The Federal Communications Commission (FCC) did order that complying with NEBS level 1 qualifies a CLEC to collocate its equipment in an ILEC facility NEBS levels 2 and 3 actually deal with system reliability Be careful to understand the realities of NEBS and the difference between compliance and certification Compliance means that the vendor says that its product meets the NEBS requirements Certification means that an independent third party has verified compliance Even compliance means that the vendor has verified that the entire product not just individual cards or shelves meets the requirements in a practical configuration It is less clear what certification means, because there are no formally approved testing laboratories, such as those meeting the National Voluntary Laboratory Accreditation Program, or recognized organizations such as Underwriters Laboratories A certifying organization, such as Telecordia (formerly Bellcore), depends on its reputation Customers may find it acceptable to ask for the vendor s NEBS test results and have them reviewed by an expert on staff This is not a trivial task, because the test results for a product of reasonable complexity can fill a thick notebook Alternatively, the customer may want independent NEBS testing Depending on the complexity of the product, this can cost from hundreds of thousands to millions of dollars
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