Telecommunications transmission measuring equipment for measuring the analog transmission characteristics of networks and circuits, including digitally encoded analog signals, analog components of digital services, e.g. ISDN, HDSL, etc., and other complex signals.

定价： 169元 / 折扣价： 144 元

The purpose of this standard is to provide test equipment requirements and methods for testing the transmission characteristics of PCM telecommunications equipment, circuits, and systems. The test equipment requirements are intended to be suitable for certification, installation, pre-service, and out-of-service operational and in-service operational tests of the PCM transmission facilities. The PCM equipment that may be tested includes primary multiplex equipment containing A-D (Analog-Digital)… read more conversion devices, digital multiplex equipment, digital links, and digital sections. This document is currently limited to testing at the analog interfaces of the primary multiplex equipment and the digital interfaces at DS1, DS1C, DS2, and DS3 levels of the North American digital hierarchy. Synchronous multiplex equipment and equipment offering other than 64 kb/s coded voiceband channels (e.g., 32 kb/s voiceband coding, 256 kb/s program, or 64 kb/s data) are not covered in this standard. Signaling parameter measurement is outside the scope of this document. read less

定价： 265元 / 折扣价： 226 元

定价： 166元 / 折扣价： 142 元

For the purpose of compatible interconnection of data processing equipment using the IEEE 802 MAC Service supported by interconnected IEEE 802 Standard Local Area Networks using different or identical Media Access Control methods, this standard specifies a general method for the operation of MAC Bridges. To this end it (1) Positions the bridging function within an architectural description of the MAC Sublayer. (2) Defines the principles of operation of the MAC Bridge in terms of the support and… read more preservation of the MAC Service, and the maintenance of Quality of Service. (3) Specifies the MAC Internal Sublayer Service provided by individual LANs to the Media Access Method Independent Functions that provide frame relay in the Bridge. (4) Identifies the functions to be performed by Bridges, and provides an architectural model of the internal operation of a Bridge in terms of Processes and Entities that provide those functions. (5) Establishes the requirements for a protocol between the Bridges in a Bridged Local Area Network to configure the network, and specifies the distributed computation of a Spanning Tree active topology. (6) Specifies the encoding of the Bridge Protocol Data Units (BPDUs). (7) Establishes the requirements for Bridge Management in the Bridged Local Area Network, identifying the managed objects and defining the management operations. (8) Specifies how the management operations are made available to a remote manager using the protocol and architectural description provided by IEEE Std 802.1B. (9) Specifies performance requirements and recommends default values and applicable ranges for the operational parameters of a Bridge. (10) Specifies the requirements to be satisfied by equipment claiming conformance to this standard. (11) Specifies criteria for the use of MAC-specific bridging methods. This standard specifies the operation of MAC Bridges that attach directly to LANs as specified in the relevant MAC standards for the MAC technology or technologies implemented. Though not part of the IEEE 802 or ISO 8802 series LAN standards, the Fibre Distributed Data Interface (FDDI) token ring, described in the ISO 9314 series of standards, can be considered an equivalent MAC. Unless indicated otherrewise, mention in this standard of 802 LANs includes FDDI. The specification of Remote Bridges, which interconnect LANs using Wide Area Network (WAN) media for the transmission of frames between Bridges, is outside the scope of this standard. read less

定价： 289元 / 折扣价： 246 元

This International Standard defines an Open Systems Interconnection (OSI) management-compatible architecture, and service and protocol elements for use in a LAN/MAN environment for the purpose of performing remote management of LAN-based or MAN-based devices. The protocol described is a connectionless-mode management protocol that makes use of Logical Link Control (LLC) Type 1 procedures as a means of conveying management information between stations in a LAN/MAN environment, thus providing for… read more interworking of ISO/IEC standard LAN/MAN devices for management purposes. The management information is conveyed using the protocol data unit (PDU) formats defined in ISO/IEC 9596-1 : 1991.1. read less

定价： 104元 / 折扣价： 89 元

Link Aggregation provides protocols, procedures, and managed objects that allow the following: One or more parallel instances of full-duplex point-to-point links to be aggregated together to form a Link Aggregation Group (LAG), such that a MAC Client can treat the LAG as if it were a single link.; A resilient interconnect using multiple full-duplex point-to-point links among one to three nodes in a network and one to three nodes in another, separately administered, network, along with a means… read more to ensure that frames belonging to any given service will use the same physical path in both directions between the two networks. This standard defines the MAC-independent Link Aggregation capability and general information relevant to specific MAC types that support Link Aggregation. The capabilities defined are compatible with previous versions of this standard. read less

定价： 202元 / 折扣价： 172 元

This standard defines Ethernet local area, access and metropolitan area networks. Ethernet is specified at selected speeds of operation; and uses a common media access control (MAC) specification and management information base (MIB). The Carrier Sense Multiple Access with Collision Detection (CSMA/CD) MAC protocol specifies shared medium (half duplex) operation, as well as full duplex operation. Speed specific Media Independent Interfaces (MIIs) provide an architectural and optional… read more implementation interface to selected Physical Layer entities (PHY). The Physical Layer encodes frames for transmission and decodes received frames with the modulation specified for the speed of operation, transmission medium and supported link length. Other specified capabilities include: control and management protocols, and the provision of power over selected twisted pair PHY types. read less

定价： 675元 / 折扣价： 574 元

This International Standard is one of a set of international standards produced to facilitate the interconnection of computers and terminals on a Local Area Network (LAN). It is related to the other international standards by the Reference Model for Open Systems Interconnection (OSI). This International Standard describes the functions, features, protocol, and services of the Logical Link Control (LLC) sublayer in the ISO/IEC 8802 LAN Protocol. The LLC sublayer constitutes the top sublayer in… read more the data link layer (see figure 1) and is common to the various medium access methods that are defined and supported by the ISO/IEC 8802 activity. Separate International Standards describe each medium access method individually and indicate the additional features and functions that are provided by the Medium Access Control (MAC) sublayer in each case to complete the functionality of the data link layer as defined in the LAN architectural reference model. This International Standard describes the LLC sublayer service specifications to the network layer (Layer 3), to the MAC sublayer, and to the LLC sublayer management function. The service specification to the network layer provides a description of the various services that the LLC sublayer, plus underlying layers and sublayers, offer to the network layer, as viewed from the network layer. The service specification to the MAC sublayer provides a description of the services that the LLC sublayer requires of the MAC sublayer. These services are defined so as to be independent of the form of the medium access methodology, and of the nature of the medium itself. The service specification to the LLC sublayer management function provides a description of the management services that are provided to the LLC sublayer. All of the above service specifications are given in the form of primitives that represent in an abstract way the logical exchange of information and control between the LLC sublayer and the identified service function (network layer, MAC sublayer, or LLC sublayer management function). They do not specify or constrain the implementation of entities or interfaces. This International Standard provides a description of the peer-to-peer protocol procedures that are defined for the transfer of information and control between any pair of data link layer service access points on a LAN. The LLC procedures are independent of the type of medium access method used in the particular LAN. To satisfy a broad range of potential applications, three types of data link control operation are included (see clause ). The first type of operation (see clause ) provides a data-link-connectionless-mode service across a data link with minimum protocol complexity. This type of operation may be useful when higher layers provide any essential recovery and sequencing services so that these do not need replicating in the data link layer. In addition, this type of operation may prove useful in applications where it is not essential to guarantee the delivery of every data link layer data unit. This type of service is described in this International Standard in terms of "logical data links." The second type of operation (see clause) provides a data-link-connection-mode service across a data link comparable to existing data link control procedures provided in International Standards such as HDLC (see ISO/IEC 13239:1997). read less

定价： 253元 / 折扣价： 216 元

This standard specifies Bridges that interconnect individual LANs, each supporting the IEEE 802 MAC Service using a different or identical media access control method, to provide Bridged Networks and VLANs.

定价： 600元 / 折扣价： 510 元

This standard defines several media independent services (MIS); handover, home energy management system (HEMS), software-defined radio access networks (SDRANs), radio resource management (RRM), and device-to-device (D2D) communication that shall be implemented in conjunction with the MIS framework as defined in IEEE Std 802.21™-2017 to optimize the performance of such services.

定价： 207元 / 折扣价： 176 元

This International Standard defines an Open Systems Interconnection (OSI) management-compatible architecture, and service and protocol elements for use in a LAN/MAN environment for the purpose of performing remote management of LAN-based or MAN-based devices. The protocol described is a connectionless mode management protocol that makes use of Logical Link Control (LLC) Type 1 procedures as a means of conveying management information between stations in a LAN/MAN environment, thus providing for… read more interworking of ISO/IEC standard LAN/MAN devices for management purposes. The management information is conveyed using the protocol data unit (PDU) formats defined in ISO/IEC 9596-1 : 1991.1. read less

定价： 131元 / 折扣价： 112 元

Link Aggregation provides protocols, procedures, and managed objects that allow the following: One or more parallel instances of full-duplex point-to-point links to be aggregated together to form a Link Aggregation Group (LAG), such that a MAC Client can treat the LAG as if it were a single link.; A resilient interconnect using multiple full-duplex point-to-point links among one to three nodes in a network and one to three nodes in anotherre, separately administered, network, along with a means… read more to ensure that frames belonging to any given service will use the same physical path in both directions between the two networks. This standard defines the MAC-independent Link Aggregation capability and general information relevant to specific MAC types that support Link Aggregation. The capabilities defined are compatible with previous versions of this standard. read less

定价： 293元 / 折扣价： 250 元

This standard defines an extensible IEEE 802® media access independent services framework (i.e., function and protocol) that enables the optimization of services including handover service when performed between heterogeneous IEEE 802 networks. It also facilitates these services when networking between IEEE 802 networks and cellular networks.

定价： 295元 / 折扣价： 251 元

This document recommends best engineering practices for the installation and deployment of IEEE 802.22 systems to help assure that such systems are correctly installed and deployed.

定价： 61元 / 折扣价： 52 元

This standard specifies radio technology independent methods for network-based coexistence among dissimilar or independently operated networks of unlicensed devices and dissimilar unlicensed devices. The standard is defined for geolocation-capable devices operating under general authorization such as television white spaces (TVWS), the 5 GHz license-exempt bands, and the general authorized access in the 3.5 GHz bands.

定价： 369元 / 折扣价： 314 元