Additional Features
A DSLAM may offer the ability to tag VLAN traffic as it passes from the subscribers to upstream routers. Though not a full stateful firewall, some DSLAMs also offer packet filtering facilities like dropping inter-port traffic and dropping certain protocols.
A DSLAM may also support quality of service (QoS) features like contention, differentiated services ("DiffServ") and priority queues.
Read more about this topic: Digital Subscriber Line Access Multiplexer
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