Fiber Optic Wiki

Single-pair high-speed digital subscriber line

December 29, 2011

Single-pair high-speed digital subscriber line (SHDSL) is a form of digital subscriber line (DSL), a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. Compared to ADSL, SHDSL employs TC-PAM modulation and frequencies that include those used by analog plain old telephone service (POTS) to provide equal transmit and receive (i.e. symmetric) data rates.

DDNS is a term used for the updating in real time

December 29, 2011

Dynamic DNS or DDNS is a term used for the updating in real time of Internet Domain Name System (DNS) name servers to keep up to date the active DNS configuration of their configured hostnames, addresses and other information.The term is used in two contexts which, while what they do in technical terms is similar, have very different purposes and user populations.

RFC 2136 dynamic DNS update

December 29, 2011

The standardized method of dynamically updating nameserver records is prescribed by RFC 2136, commonly known as 'Dynamic DNS Update' or 'DDNS'. Unlike updates through a DDNS provider, RFC 2136 is a protocol in its own right, with its own security mechanisms, and for use with managed nameservers.

DNS facility still used static lookup tables

December 29, 2011

In the initial stages of the Internet (ARPANET) addressing of hosts on the network was achieved by static translation tables that mapped hostnames to IP addresses. The tables were maintained manually in form of the hosts file. The Domain Name System brought a method of distributing the same address information automatically online through recursive queries to remote databases configured for each network, or domain.

Function of dynamic DNS

December 29, 2011

In Microsoft Windows networks, dynamic DNS is an integral part of Active Directory, because domain controllers register their network service types in DNS so that other computers in the Domain (or Forest) can access them.

DDNS for ISP users

December 29, 2011

Dynamic DNS providers offer a software client program that automates the discovery and registration of the client system's public IP addresses. The client program is executed on a computer or device in the private network.

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