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If a node A on the Internet is closer (fewer hops away) to the Internet backbone than a node B, then A is said to be upstream of B or conversely, B is downstream of A. Related to this is the idea of upstream providers. An upstream provider is usually a large ISP that provides Internet access to a local ISP. Hence, the word upstream also refers ...
One process sending data primarily in the downstream direction is downloading. However, the overall download speed depends on the downstream speed of the user, the upstream speed of the server, and the network between them. In the client–server model, downstream can refer to the direction from the server to the client.
In computer networking, upstream server refers to a server that provides service to another server. In other words, upstream server is a server that is located higher in a hierarchy of servers. The highest server in the hierarchy is sometimes called the origin server —the application server on which a given resource resides or is to be ...
Once upstream and downstream circuits are established, a subscriber can connect to a service such as an Internet service provider or other network services, like a corporate MPLS network. The underlying technology of transport across DSL facilities uses modulation of high-frequency carrier waves, an analog signal transmission.
The downstream band is used for communicating from the central office to the end user. Frequency plan for ADSL Annex A, with frequency-division multiplexing. [3] Red area is the frequency range used by normal voice telephony , the green (upstream) and blue (downstream) areas are used for ADSL.
Released in December 2001, DOCSIS 2.0 enhanced upstream data rates in response to increased demand for symmetric services such as IP telephony. DOCSIS 3.0 (abbreviated D3) Released in August 2006, DOCSIS 3.0 significantly increased data rates (both upstream and downstream) and introduced support for Internet Protocol version 6 (IPv6). DOCSIS 3.1