The Juniper Networks ADSL Physical Interface Modules (PIMs) are for use with the J-series services routers, J4300 and J6300. The ADSL PIMs, one supporting Annex A (over POTS) and the other Annex B (over ISDN), each include one physical ADSL port that support ADSL, ADSL2 or ADSL2+ protocols. The Juniper ADSL PIMs provide a single physical interface to ADSL network media types, receiving incoming packets from the network and transmitting outgoing packets to the network. The Juniper ADSL PIMs are equipped with a dedicated network processor that forwards incoming data packets to the Routing Engine, and receives outgoing data packets from the Routing Engine. During this process, the PIMs perform framing and line-speed signaling.