ISO/IEC 11801-5:2017 pdf download – Information technology – Generic cabling for customer premises – Part 5: Data centres.
5 Structure of the generic cabling system 5.1 General Clause 5 identifies the functional elements of generic cabling for data centres, describes how they are connected together to form subsystems and identifies the interfaces at which application-specific components are connected to the generic cabling. Examples of structures in accordance with Clause 5 can be found in Annex C. Applications listed in ISO/IEC 1 1 801 -1 :201 7, Annex E are supported by connecting active equipment at the external network interfaces, equipment outlets and the distributors. Examples of network architectures in accordance with Clause 5 can be found in Annex D. 5.2 Functional elements The functional elements of generic cabling are as follows: a) external network interface (ENI) – not defined in ISO/IEC 1 1 801 -1 ; b) network access cable – not defined in ISO/IEC 1 1 801 -1 ; c) main distributor (MD) – equivalent to distributor 3 in ISO/IEC 1 1 801 -1 ; d) main distribution cable – equivalent to subsystem cable 3 in ISO/IEC 1 1 801 -1 ; e) intermediate distributor (ID) – equivalent to distributor 2 in ISO/IEC 1 1 801 -1 ; f) intermediate distribution cable – equivalent to subsystem cable 2 in ISO/IEC 1 1 801 -1 ; g) zone distributor (ZD) – equivalent to distributor 1 in ISO/IEC 1 1 801 -1 ; h) zone distribution cable – equivalent to subsystem cable 1 in ISO/IEC 1 1 801 -1 ; i) local distribution point (LDP) – equivalent to consolidation point in ISO/IEC 1 1 801 -1 ; j) local distribution point cable (LDP cable) – equivalent to cable Y in ISO/IEC 1 1 801 -1 ; k) equipment outlet (EO) – equivalent to TE outlet in ISO/IEC 1 1 801 -1 . Groups of these functional elements are connected together to form cabling subsystems to provide the required applications to the telecommunications equipment and terminal equipment.The cabling subsystems are connected together to create a generic cabling system with a structure as shown in Figure 2. The composition of the cabling subsystems is described in 5.4.2, 5.4.3, 5.4.4 and 5.4.5. The functional elements of the cabling subsystems are interconnected to form a hierarchical star topology as shown in Figure 3. The functions of multiple distributors can be combined, see 5.7.1 . Connections between cabling subsystems are either indirect, requiring application-specific equipment, or direct. Connection to application-specific equipment at an MD, ID or a ZD adopts either an interconnect or a cross-connect approach (see ISO/IEC 1 1 801 -1 ). Connection to application-specific equipment at an ENI and EO adopts an interconnect approach (see ISO/IEC 1 1 801 -1 ). Direct connections between cabling subsystems adopt either a cross-connect approach, by way of either patch cords or jumpers, or an interconnect approach.
5.4 Cabling subsystems 5.4.1 General Although work area cords (equivalent to the TE cords of ISO/IEC 1 1 801 -1 ) and equipment cords are used to connect terminal and transmission equipment, respectively, to the cabling subsystem, they are not considered part of the cabling subsystem because they can be application specific. The optional redundancy between distributors as shown in Figure 3 shall be provided by the use of tie cabling. Tie cabling is not considered as a part of the hierarchical structure within this document. If provided, it shall include a) the tie cable, b) the mechanical termination of the tie cable at the peer distributors. 5.4.2 Network access cabling subsystem The network access cabling subsystem extends from an MD (or ID, or ZD) to the ENIs or to the ISO/IEC 1 1 801 series distributors (see Figure 2). The subsystem includes a) the network access cables, b) the mechanical termination of the network access cables at the ENI(s), c) the mechanical termination of the network access cables at the MD, ID(s), ZD(s) or other distributors in accordance with ISO/IEC 1 1 801 -1 .
5.4.3 Main distribution cabling subsystem The main distribution cabling subsystem extends from an MD to the ID(s) (or ZD(s)) connected to it. The subsystem includes a) the main distribution cables, b) the mechanical termination of the main distribution cables at the MD together with associated patch cords and/or jumpers at the MD, c) the mechanical termination of the main distribution cables at the ID(s) or ZD(s). 5.4.4 Intermediate distribution cabling subsystem The intermediate distribution cabling subsystem extends from an ID to the ZD(s) connected to it. The subsystem includes a) the intermediate distribution cables, b) the mechanical termination of the intermediate distribution cables at the ID together with associated patch cords and/or jumpers at the ID, c) the mechanical termination of the intermediate distribution cables at the ZD(s).