Not Applicable for this product.Options3Com® 1000BASE-LX SFP TransceiverProduct #: 3CSFP92Adds a 1000BASE-LX backbone link by enabling the SFP slots inselected 3Com switches and modules3Com® 1000BASE-SX SFP TransceiverProduct #: 3CSFP91Adds a 1000BASE-SX backbone link by enabling the SFP slots inselected 3Com switches and modulesInstallation and Maintenance Service Options3Com® Express ServiceOne year of advance hardware replacement, telephone technicalsupport, and software upgradesNetwork Installation ServiceInstallation assistance from setup through training to speedimplementation and optimize solution useNetwork Health Check Service3Com recommends the Network Health Check Service to identifythe cause of network problems and to make recommendations forthe optimization of the data infrastructure.3Com® Guardian ServiceOne year of on-site assistance, telephone technical support, andsoftware upgrades3Com® Network Voice Readiness AssessmentComprehensive, pro-active assessment that includes a simulationof voice traffic over an existing data network to identify potentialVoIP sound quality issuesRelated Products 3Com® Baseline Switch 2426-PWR Plus