... .4 port adsl2/2+ router 2.Supports Annex M, which can double upstream data rates 3.Built-in 4-port Switch 4 port adsl2 ... With Annex M enabled)ATM FeaturesUNI 3.1/4.0,ATM Adaptation Layer Type 5-AAL5Multiprotocol encapsulation ... Hardware SpecificationPorts4 10/100M LAN ports(RJ45 )1 Line port(RJ11)LED IndicatorsPower, ADSL, ACT, USB, LAN1 ... Storage Humidity: 5%~90% non-condensing 4 port adsl 2+ router