Editing DSLAM (section)

==Hardware details==
Customers connect to the DSLAM through [[ADSL modem]]s or DSL [[Router (computing)|routers]], which are connected to the [[Public switched telephone network|PSTN]] network via typical [[unshielded twisted pair]] telephone lines. Each DSLAM has multiple aggregation cards, and each such card can have multiple [[Computer port (hardware)|ports]] to which the customers' lines are connected. Typically a single DSLAM aggregation card has 24 ports, but this number can vary with each manufacturer.

The most common DSLAMs are housed in a [[telephone company|telco]]-grade chassis, which are supplied with (nominal) 48 volts [[direct current|DC]]. Hence a typical DSLAM setup may contain power converters, DSLAM chassis, aggregation cards, cabling, and upstream links.

On the upstream trunk (ISP) side many early DSLAMs used [[Asynchronous Transfer Mode|ATM]]—and this approach was standardized by the [[DSL Forum]]—with [[Gigabit Ethernet]] support appearing sometime later.<ref name="HellbergBoyes2007">{{cite book|author1=Chris Hellberg|author2=Truman Boyes|author3=Dylan Greene|title=Broadband Network Architectures: Designing and Deploying Triple-Play Services|year=2007|publisher=Pearson Education|isbn=978-0-13-270451-9|page=12}}</ref> Today, the most common upstream links in these DSLAMs use [[Gigabit Ethernet]] or multi-gigabit [[Optical fiber|fiber optic]] links.{{citation needed|date=December 2013}}