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Class of service (COS or CoS) is a parameter used in data and voice protocols to differentiate the types of payloads contained in the packet being transmitted. The objective of such differentiation is generally associated with assigning priorities to the data payload or access levels to the telephone call.
The reactor software design pattern is an event handling strategy that can respond to many potential service requests concurrently.The pattern's key component is an event loop, running in a single thread or process, which demultiplexes incoming requests and dispatches them to the correct request handler.
NetFlow is a feature that was introduced on Cisco routers around 1996 that provides the ability to collect IP network traffic as it enters or exits an interface. By analyzing the data provided by NetFlow, a network administrator can determine things such as the source and destination traffic, class of service, and the causes of congestion.
Different PHBs may be defined to offer, for example, low-loss or low-latency service. Rather than differentiating network traffic based on the requirements of an individual flow, DiffServ operates on the principle of traffic classification , placing each data packet into one of a limited number of traffic classes.
Examples of CPE types include modems, routers, gateways, set-top boxes, and VoIP-phones. TR-069 was first published in May 2004, with amendments in 2006, 2007, 2010, July 2011 (version 1.3), [ 1 ] and November 2013 (version 1.4 am5) [ 2 ] The Home Gateway Initiative (HGI), Digital Video Broadcasting Project (DVB) and WiMAX Forum have endorsed CWMP.
Each Class of Service determines the level of service required. [4] To identify the Class of Service for a specific service, the network's switches and routers examine the call based on several factors. Such factors can include: [2] The type of service and priority due to precedence; The identity of the initiating party; The identity of the ...
CSUs can be categorized by the class of service they support (DS1, DS3, DDS, etc.) and by the capabilities within that class.For example, basic DS1 (T1) CSUs support loopback of each interface and will produce alarm indication signal to the provider's network interface device (NID) in the event of loss of signal from the customer-premises equipment (CPE).
The type of service (ToS) field is the second byte of the IPv4 header. It has had various purposes over the years, and has been defined in different ways by five RFCs. [1] Prior to the redefinition, the ToS field could specify a datagram's priority and request a route for low-latency, high-throughput, or highly-reliable service.