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Hello!Expansion / ConnectivityCompatible Slots:1 x Expansion SlotInterfaces:16 x phone line - RJ-11GeneralDevice Type:Modem (analogue)Form Factor:InternalModem56K Technology:V.90, V.92Analogue Ports Qty:8Connectivity Technology:WiredData Compression Protocol:MNP-5, ITU V.42bisError Correction Protocol:MNP-4, ITU V.42, MNP-2, MNP-3Fax Compatibility:G3Max Transfer Rate:56 KbpsProtocols & Specifications:Bell 103, ITU V.21, Bell 212A, ITU V.22, ITU V.22bis, ITU V.29, ITU V.32, ITU V.32bis, ITU V.34, ITU V.90, ITU V.17, ITU V.23, ITU V.27ter, ITU V.34bis, ITU V.92Compatibility InformationDesigned For:Cisco 2611XM, 2611XM VPN Bundle, 2620XM, 2621XM VPN Bundle, 2650XM, 2651XM VPN Bundle, 2691, 2811 Security Bundle, 2821 Security Bundle, 2851 Security Bundle, 3660, 3725, 3745, 3745 VPN Bundle, 3825 Security Bundle, 3845 Security Bundle, 3845 V3PN Bundle