digital subscriber line access multiplexer (DSLAM, often pronounced dee-slam) is a network device, often located in the telephone exchanges of the telecommunications operators.

It connects multiple customer digital subscriberline(DSL) interfaces to a high-speed digital communications channel using multiplexing techniques.

By placing additional DSLAMs at locations remote from the telephone exchange, telephone companies provide DSL service to locations previously beyond effective range.

In telecommunications and computer networks, multiplexing (also known asmuxing) is a method by which multiple analog message signals or digital data streams are combined into one signal over a shared medium.

The aim is to share an expensive resource. For example, in telecommunications, several telephone calls may be carried using one wire.

Multiplexing originated intelegraphy, and is now widely applied in communications.

Cisco PIX
Pix_firewallCisco PIX (Private Internet eXchange) is a popular IP firewall and network address translation (NAT) appliance. It was one of the first products in this market segment.
In 2005, Cisco introduced the newer Adaptive Security Appliance (ASA), that inherited much of PIX features, and in 2008 announced PIX end-of-sale.
The PIX technology is still sold in a blade, the FireWall Services Module (FWSM), for the Cisco Catalyst 6500 switch series and the 7600 Router series.

product_data_sheet0900aecd8016be8d-1The Cisco® Gigabit Ethernet High-Speed WAN Interface Card (HWIC) brings Gigabit Ethernet connectivity to Cisco Integrated Services Routers routers to accelerate applications such as Metro Ethernet access, inter-VLAN routing, and high-speed connectivity to LAN switches.

Glossary of ISDN and Telephone Terminology

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