Siemens DSLAM SURPASS hiX 5625 A Digital Subscriber Line Access Multiplexer (DSLAM) allows telephone lines to make faster connections to the Internet. It is a network device, located near the customer's location, that connects multiple customer Digital Subscriber Line (DSL)s to a high-speed Internet backbone line using multiplexing techniques. By locating DSLAMs at locations remote to the telephone company central office (CO), telcos are now providing DSL service to consumers who previously did not live close enough for the technology to work. Image File history File linksMetadata Download high-resolution version (1600x1200, 692 KB) Siemens DSLAM SURPASS hiX 5625 in a Krone rack From de. ...
Image File history File linksMetadata Download high-resolution version (1600x1200, 692 KB) Siemens DSLAM SURPASS hiX 5625 in a Krone rack From de. ...
This article or section includes a list of works cited or a list of external links, but its sources remain unclear because it lacks in-text citations. ...
A DSL Modem DSL or xDSL, is a family of technologies that provide digital data transmission over the wires of a local telephone network. ...
Each line is drawn between two nodes, representing two IP addresses. ...
In telecommunications, multiplexing (also muxing or MUXing) is the combining of two or more information channels onto a common transmission medium using hardware called a multiplexer or (MUX). ...
A telephone operator manually connecting calls with patch cables at a telephone switchboard. ...
A telephone company (or telco) provides telecommunications services such as telephony and data communications. ...
Path taken by data to DSLAM
- Residential/commercial source: DSL modem plugged into the customer's computer.
- Local loop: the telephone company wires from a customer to the telephone company's central office, often called the "last mile".
- Main Distribution Frame (MDF): a wiring rack that connects outside subscriber lines with internal lines. It is used to connect public or private lines coming into the building to internal networks. In a telco CO, the MDF is generally in proximity to the cable vault and not far from the telephone switch.
- DSLAM: a device for DSL service. Sending on the customer or downstream side, it intermixes voice traffic and VDSL traffic onto the customer's DSL line. Receiving on that side, it accepts and separates outgoing phone and data signals from the customer. It directs the data signals upstream towards the appropriate carrier's network, and the phone signals towards the voice switch.
- From the DSLAM the telephone wires, now cleansed of DSL signals, go through the MDF again to the voice switch so the customer will have dial tone phone service. Old-fashioned voice signals pass between voice switch and subscriber line through DSLAM, which does not disturb them but adds a higher frequency signal to carry data for Internet service.
An ADSL modem, also known as a DSL modem, is a device used to connect one or more computers to a phone line, in order to use an ADSL service. ...
In telecommunications, the local loop is the wiring between the central office (telephone exchange in British English) and the customers premises demarcation point. ...
In telecommunication, a main distribution frame (MDF) is a distribution frame on one part of which the external trunk cables entering a facility terminate, and on another part of which the internal user subscriber lines and trunk cabling to any intermediate distribution frames terminate. ...
DSL may refer to: Damn Small Linux Dark and Shattered Lands, a MUD based loosely on Forgotten Realms and Dragonlance books. ...
In information technology downstream refers to the transfer speed (usually that of an internet connection) by which data can be sent from the server to the client. ...
It has been suggested that VDSL2 be merged into this article or section. ...
Upstream in computing is the speed at which data can be transferred from the client to the server (uploading). ...
A telephone operator manually connecting calls with patch cables at a telephone switchboard. ...
A dial tone is a telephony signal used to indicate that the telephone exchange is working and ready to accept a call. ...
Plain old telephone service, or POTS, are the services available from analogue telephones prior to the introduction of electronic telephone exchanges into the public switched telephone network. ...
A telephone operator manually connecting calls with patch cables at a telephone switchboard. ...
Role of the DSLAM The DSLAM at the CO collects the digital signals from its many modem ports and combines them into one signal, via multiplexing. The term digital signal is used to refer to more than one concept. ...
In telecommunications, multiplexing (also muxing or MUXing) is the combining of two or more information channels onto a common transmission medium using hardware called a multiplexer or (MUX). ...
Depending on the product, DSLAMs connect DSL lines with some combination of Asynchronous Transfer Mode (ATM), frame relay or Internet Protocol networks. Asynchronous Transfer Mode (ATM) is a cell relay, Circuit switching network and data link layer protocol which encodes data traffic into small (53 bytes; 48 bytes of data and 5 bytes of header information) fixed-sized cells. ...
In the context of computer networking, frame relay (also found written as frame-relay) consists of an efficient data transmission technique used to send digital information quickly and cheaply in a relay of frames to one or many destinations from one or many end-points. ...
The Internet Protocol (IP) is a data-oriented protocol used for communicating data across a packet-switched internetwork. ...
In terms of the OSI 7 Layer Model, the DSLAM acts like a massive network switch, since its functionality is purely Layer 2. The Open Systems Interconnection Basic Reference Model (OSI Reference Model or OSI Model for short) is a layered, abstract description for communications and computer network protocol design, developed as part of Open Systems Interconnection (OSI) initiative. ...
Linksys 8 port consumer switch Linksys 48 port switch A network switch is a computer networking device that connects network segments. ...
This article does not cite any references or sources. ...
The aggregated signal then loads onto backbone switching equipment, traveling through an access network (AN) — also known as a Network Service Provider (NSP) — at speeds of up to 10 Gbit/s and connecting to the Internet-backbone. A backbone network is the part of a hierarchical network that occupies the top level of that hierarchy: it connects to nothing but itself, or nodes at lower levels in the hierarchy. ...
An access network is that part of a communications network which connects subscribers to their immediate service provider. ...
A network service provider (NSP) is a business or organization that sells bandwidth or network access by providing direct backbone access to the Internet and usually access to its network access points (NAPs). ...
A gigabit per second (gbps or gbit/s) is a unit of data transmission equal to 1,000 megabits per second or 1,000,000 kilobits per second or 1,000,000,000 bits per second. ...
The DSLAM, functioning as a switch, collects the ADSL modem data (connected to it via twisted or non-twisted pair copper wire) and multiplexes this data via the gigabit link that physically plugs into the DSLAM itself, into the Telco's backbone. Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. ...
DSLAM is not always located in the telco central office, but may also serve customers within a neighborhood Serving Area Interface (SAI), sometimes in association with a digital loop carrier. DSLAMs are also used by hotels, lodges, golfing estates, residential neighbourhoods and other corporations setting up their own private telephone exchange. The serving area interface or SAI often called B-Box, cross-connect box, or Access Point (AP) is an outdoor telecommunications cabinet usually mounted on the ground on cable right-of-ways but can also be located on poles. ...
The local loop is the physical connection between the main distribution frame in the users premises to the telecommunications network provider. ...
PBX redirects here. ...
Besides being a data switch and multiplexer, DSLAM is also a large number of modems, each modem on the aggregation card communicating with a subscriber's DSL modem. This modem function being inside the DSLAM rather than separate hardware, and being wideband rather than voiceband, it isn't often called a modem. Like voiceband modems of standard v.32 and later, it has the ability to probe the line and train itself to compensate for echoes and other impairments, in order to move data at the maximum rate the line allows. This is also why twisted pair DSL services have a longer range than twisted pair (UTP) Ethernet. An ADSL modem, also known as a DSL modem, is a device used to connect one or more computers to a phone line, in order to use an ADSL service. ...
V.32 is an ITU-T recommendation for a modem, allowing bidirectional data transfer at either 9. ...
25 Pair Color Code Chart 10BASE-T UTP Cable Twisted pair cabling is a common form of wiring in which two conductors are wound around each other for the purposes of cancelling out electromagnetic interference known as crosstalk. ...
25 Pair Color Code Chart 10BASE-T UTP Cable Twisted pair cabling is a common form of wiring in which two conductors are wound around each other for the purposes of cancelling out electromagnetic interference known as crosstalk. ...
Speed vs Distance Balanced pair cable has higher attenuation at higher frequencies, hence the longer the wire between DSLAM and subscriber, the slower the maximum possible data rate. The following is a rough guide to the relation between wire distance and maximum data rate. Local conditions may vary, especially beyond 2 km, often necessitating a closer DSLAM to bring acceptable speeds: Attenuation is the reduction in amplitude and intensity of a signal with respect to distance traveled through a medium. ...
- 25 Mbit/s at 1000 feet ~300 m
- 24 Mbit/s at 2000 feet ~600 m
- 23 Mbit/s at 3000 feet ~900 m
- 22 Mbit/s at 4000 feet ~1.2 km
- 21 Mbit/s at 5000 feet ~1.5 km
- 19 Mbit/s at 6000 feet ~1.8 km
- 16 Mbit/s at 7000 feet ~2.1 km
- ~
- 1.5 Mbit/s at 15,000 feet 4.5 km
- 800 kbit/s at 17,000 feet ~5.2 km
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 virtual LAN, commonly known as a vLAN or as a VLAN, is a method of creating independent logical networks within a physical network. ...
A large core router used for major networks. ...
In computing, a stateful firewall (any firewall that performs stateful packet inspection or stateful inspection) is a firewall that keeps track of the state of network connections (such as TCP streams) traveling across it. ...
In computing, a firewall is a piece of hardware and/or software which functions in a networked environment to prevent some communications forbidden by the security policy, analogous to the function of firewalls in building construction. ...
In the field of telecommunications, a communications protocol is the set of standard rules for data representation, signalling, authentication and error detection required to send information over a communications channel. ...
The DSLAM also supports quality of service (QoS) features like contention, differentiated services ("DiffServ") and priority queues. In the fields of packet-switched networks and computer networking, the traffic engineering term Quality of Service (QoS) refers to control mechanisms that can provide different priority to different users or data flows, or guarantee a certain level of performance to a data flow in accordance with requests from the...
In telecommunication, the term contention has the following meanings: 1. ...
This article is on differentiated services within communication networks. ...
A priority queue is an abstract data type in computer programming, supporting the following three operations: add an element to the queue with an associated priority remove the element from the queue that has the highest priority, and return it (optionally) peek at the element with highest priority without removing...
Hardware details Customers connect to the DSLAM through ADSL modems or DSL routers, which are connected to the PSTN network via typical unshielded twisted pair telephone lines. Each DSLAM has multiple aggregation cards, and each such card can have multiple 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 telco-grade chassis, which are supplied with (nominal) 48 volts DC. Hence a typical DSLAM setup may contain power converters, DSLAM chassis, aggregation cards, cabling, and upstream links. The most common upstream links in these DSLAMs use gigabit ethernet or multi-gigabit fiber optic links. An ADSL modem, also known as a DSL modem, is a device used to connect one or more computers to a phone line, in order to use an ADSL service. ...
A large core router used for major networks. ...
The public switched telephone network (PSTN) is the network of the worlds public circuit-switched telephone networks, in much the same way that the Internet is the network of the worlds public IP-based packet-switched networks. ...
It has been suggested that this article or section be merged into Twisted pair. ...
Ports on the Apple iBook (Early 2003) In computer hardware, a port serves as an interface between the computer and other computers or devices in the form of an electrically wired outlet on a piece of equipment into which a plug or cable connects. ...
A telephone company (or telco) provides telecommunications services such as telephony and data communications. ...
Josephson junction array chip developed by NIST as a standard volt. ...
Direct current (DC or continuous current) is the continuous flow of electricity through a conductor such as a wire from high to low potential. ...
Gigabit Ethernet (GbE) is a term describing various technologies for transmitting Ethernet packets at a rate of a gigabit per second, as defined by the IEEE 802. ...
Optical fibers An optical fiber (or fibre) is a glass or plastic fiber designed to guide light along its length by confining as much light as possible in a propagating form. ...
IP-DSLAM IP-DSLAM stands for Internet Protocol Digital Subscriber Line Access Multiplexer. User traffic is mostly IP based. The Internet Protocol (IP) is a data-oriented protocol used for communicating data across a packet-switched internetwork. ...
Traditional 20th century DSLAM used ATM (Asynchronous Transfer Mode) technology to connect to upstream ATM routers/switches. These devices then extract the IP traffic and pass it on to an IP network. IP-DSLAMs extract the IP traffic at the DSLAM itself. Thus it is all IP from there. Advantage of IP-DSLAM over a traditional ATM DSLAM is in terms of lower CAPEX/OPEX and a richer set of features and functionality. IP has a rich existing and ever-growing protocol set. Capital expenditures (CapEx) are expenditures used by a company to acquire or upgrade physical assets such as equipment, property, or industrial buildings. ...
Operating expenditures (often abbreviated to OPEX) are the on-going costs for running a product, business, or system. ...
See also In telecommunications, the Triple Play service is a marketing term for the provisioning of the three services: high-speed Internet, television (Video on Demand or regular broadcasts) and telephone service over a single broadband connection. ...
Symmetric high-speed digital subscriber line (SHDSL) is a telecommunications technology for Digital Subscriber Line (DSL) subscriber lines. ...
Symmetric Digital Subscriber Line (SDSL) is a Digital Subscriber Line (DSL) variant with E1-like data rates (72 to 2320 kbit/s). ...
ISDN Digital Subscriber Line (IDSL) transmits data digitally (rather than analog) on a regular twisted pair copper telephone line, across existing ISDN lines, at a rate of 144 kbit/s, slightly higher than a bonded dual channel ISDN connection at 128kbit/s. ...
A cable modem termination system or CMTS is equipment typically found in a cable companys headend and is used to provide high speed data services, such as Cable Internet or Voice over IP, to cable subscribers. ...
A broadband remote access server (BRAS) routes traffic to and from the digital subscriber line access multiplexers (DSLAM) on an Internet service providers (ISP) network. ...
A WildBlue Satellite Internet dish. ...
This article is becoming very long. ...
Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. ...
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