protocol layer

protocol layer

(networking)
The software and/or hardware environment of two or more communications devices or computers in which a particular network protocol operates. A network connection may be thought of as a set of more or less independent protocols, each in a different layer or level. The lowest layer governs direct host-to-host communication between the hardware at different hosts; the highest consists of user application programs. Each layer uses the layer beneath it and provides a service for the layer above. Each networking component hardware or software on one host uses protocols appropriate to its layer to communicate with the corresponding component (its "peer") on another host. Such layered protocols are sometimes known as peer-to-peer protocols.

The advantages of layered protocols is that the methods of passing information from one layer to another are specified clearly as part of the protocol suite, and changes within a protocol layer are prevented from affecting the other layers. This greatly simplifies the task of designing and maintaining communication systems.

Examples of layered protocols are TCP/IP's five layer protocol stack and the OSI seven layer model.
References in periodicals archive ?
According to multi-layer structure of protocol stack, QoS metrics are different for each protocol layer, and forms the layered QoS metrics structure in modern wireless networks.
The opening chapter discusses the four layers of the TCP-IP protocol layer stock in the context of cognitive radio networks.
They are trying to solve issues that may have roots at the protocol layer or the physical layer on JTAG scan chains that have a wide variety of potential variations.
Other features include protocol layer analysis (through to th e application layer), a programming interface (for modifying existing 3GPP test cases and creating customised test scenarios), a graphical user interface, automated test sequences and the use of standardised interfaces and National Instruments Laboratory Windows CVI programming language to facilitate integration into existing automated laboratory solutions.
In the next release of NetWare, Novell Inc says it will separate the communications and security engines in the NCP NetWare core protocol layer to enable NetWare's communications infrastructure to be applied to http.
CANbus TD or CANbus TDM and a Wave Runner 6000A Series scope is suitable for locating CAN Bus physical layer problems and for debugging CAN Bus controllers and systems, allowing the user to correlate physical layer signals with protocol layer data information.
That makes it essential to filter out all unnecessary information relative to the protocol layer being debugged and store only essential information in trace buffer.
In addition to the faster signaling rate, PCI-SIG working groups also added several new protocol layer improvements to the PCIe Base 2.
3 physical layer for robust electrical isolation and 100 meter cable lengths with a deterministic protocol layer engineered by Danaher Motion.
Due to the convergence of data, voice, and video services in these networks, vendors are seeking to enhance test equipment capability to integrate physical and protocol layer level testing for multiple standards, interfaces, and protocols in a single instrument, observes the analyst of this research service.
Multi Protocol Layer Switching (MPLS): A set of protocols for provisioning and managing core networks, using a technique known as label switching to forward data through the network through a small, fixed-format label inserted in front of each data packet on entry into the MPLS network.

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