communications protocol

(redirected from Network protocols)
Also found in: Dictionary, Thesaurus.

communications protocol

Hardware and software that governs data transmission between computers and mobile devices. The term "protocol" is very generic and is used for hundreds of different communications methods. A protocol may define the packet structure of the data transmitted or the control commands that manage the session, or both. A protocol "suite" such as TCP/IP is made up of several levels of functionality. Learning the 7-layer protocol hierarchy, known as the "OSI model," is essential for understanding protocols. See OSI model and interface.

TCP/IP and Ethernet
TCP/IP is the standard routing protocol of the Internet and most internal networks. It ensures that every message sent was received in full. Ethernet is an access method that is responsible for moving packets from one node to another. See TCP/IP, Ethernet, Token Ring, ATM, IPX, SPX, NetBIOS, NetBEUI and SS7.

Conceptually Speaking


The following are very conceptual exchanges managed by TCP/IP and Ethernet.

TCP/IP Protocol
Are you there? Yes, I am. Are you ready to receive? Yes, I am. Here comes the message--blah, blah, blah-- did you get it? Yes, I did. Here comes the next part--blah, blah, blah-- did you get it? No, I didn't - resend it. Here it comes again-- blah, blah, blah-- did you get it? Yes, I did. There is no more. Goodbye. Goodbye.

Ethernet Access Method (Shared Hub Example)
Is the network busy? Yes, it is. Wait random amount of time. Is the network busy? Yes, it is. Wait random amount. Is the network busy? No, it isn't. Here goes the frame... did it collide with another packet on the line? No, it didn't. Is the network busy? Yes, it is. Wait random amount. Is the network busy? No, it isn't. Here goes the next frame... did it collide? Yes, it did. Wait random amount. Is the network busy? No, it isn't. Here goes the frame again... did it collide?

Examples


The following communications protocols are or have been widely used (name in parentheses is the protocol suite). There are a large number of protocols at all layers. For a comprehensive list with detailed descriptions, visit www.protocols.com.

Layer Protocol

     1       RS-232
     1       V.35
     1       SONET

     1-2     802.11 wireless (Wi-Fi)
     1-2     Bluetooth wireless

     2       Ethernet
     2       Fast Ethernet
     2       Gigabit Ethernet
     2       Token Ring
     2       FDDI
     2       ATM

     3       IP      (TCP/IP)
     3       IPX     (NetWare)

     4       TCP     (TCP/IP)
     4       UDP     (TCP/IP)
     4       SPX     (NetWare)
     4       NetBEUI (NetBIOS)

     5       NetBIOS

     6       ASN.1

     7       SMB     (NetBEUI)
     7       AFP     (AppleTalk)
     7       NCP     (NetWare)
     7       NFS     (TCP/IP)
     7       HTTP    (TCP/IP)
     7       FTP     (TCP/IP)
     7       SMTP    (TCP/IP)
     7       DNS     (TCP/IP)
References in periodicals archive ?
LONDON, January 11 /PRNewswire/ -- Metaswitch Networks, the world's leading independent provider of network protocol software (http://www.
But a SNAP operates not only on the network protocol layers but also on the upper layer protocol.
LONDON -- Metaswitch Networks, the world's leading independent provider of network protocol software, announced today that Huawei Technologies has expanded on the companies' existing relationship by licensing a broad portfolio of Metaswitch's network protocol software to power Huawei's next generation family of packet transport platforms.
LONDON -- Data Connection (DCL), the world's leading independent provider of network protocol software, announced that Palo Alto Networks is using Data Connection's DC-OSPF and DC-RIP IP routing protocol stacks on their PA Series next-generation firewall products.
0 Unveils SSL Decryption Breakthrough Technology While Supporting Every Network Protocol and File Format
SAN DIEGO -- PostPath, creator of the Linux-based PostPath Email and Collaboration Server, publicly demonstrated native, network protocol level compatibility with Microsoft Outlook[TM], Active Directory[TM], already installed Exchange Servers, and other email ecosystem applications such as BlackBerry[TM].
SafeNet SafeEnterprise(TM) Encryptors are trusted solutions for a full range of network topologies, including Ethernet, SONET/SDH, ATM, Frame, Link network, and other network protocols.
PostPath created an alternative by combining publicly available documentation with packet-level protocol decoding to implement the Exchange network protocols on the PostPath Linux email server.
Since our encoding systems are optimized for the low bit rates and network protocols specific to the delivery of video to mobile devices, NEXAGE customers are insured they will have the flexibility to package high quality, interactive content to any subscriber.
Tim Hall, Data Connection's Vice President of Network Protocols, said, "The SIPits are incredibly valuable to the product development cycle.
will be a vehicle to assist RFM in carrying out its strategic plan to assemble wireless solutions with products, technologies, and applications composed of a wide range of radio modules, gateways, wireless sensor networks, point-to-point and mesh network protocols with development tools.
Our software radio technology will help Mid Tex Cellular to capture new sources of revenue and in the future, allow simultaneous support for multiple wireless network protocols and add scalability to the existing infrastructure.

Full browser ?