YDI Link CX-24 User Manual
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Contents
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Link CX-24 User’s ManualVersion 1.0 Page 14 February 2004protection. If the mounting point described above provides adequate lightning protection, the Link CX-24radio will still need a good earth ground to a bare-metal earth ground. Refer to Appendix D for detailedgrounding and lightning protection recommendations.Cable Routing: The Link CX-24 DS-3, and/or Ethernet data cables connect associated externalequipment to the Link CX-24 radio. Before installation, procure cable ties and/or standoffs to route and tocreate service loops for these cables.Physical Security: The Link CX-24 radio is typically mounted high enough to prevent casual tampering.The Link CX-24 radio is further protected by anti-tampering chassis screws that prevent most casualattempts to open the chassis.2.4 Planning Element and Network Management Ethernet Links2.4.1 Links From the EMS or NMS to the Link CX-24The Link CX-24 communicates with SNMP-based Element Management Systems and NetworkManagement Systems over Ethernet communication links. Because the Link CX-24 contains twoindependent switched Ethernet ports, one Link CX-24 can be connected directly to an Ethernet switch orrouter, and collocated Link CX-24s can be cascaded. Figure 2.2 shows some common arrangements forthe EMS and/or NMS Ethernet links.The cable run from the Ethernet switch or router to the Link CX-24 must be 100 m (328 ft.) or less, andcan be straight-through or crossover, because the Link CX-24 Ethernet ports automatically detect thetransmit and receive pairs and switch them if necessary. YDI sells 25 m (82 ft.), 50 m (14 ft.), and 100 m(328 ft.) Ethernet cables with the correct connectors for these links, as described in Section 1.7.6.Alternatively, when Link CX-24s are to be cascaded as shown in Figure 2.2 (B), YDI sells a 6 m (20 ft.)Ethernet cable with the correct connectors for the Link CX-24-to-Link CX-24 links, as described in Section1.7.6. Note that the EMS or NMS must be within eight or fewer Ethernet hops of the Link CX-24 for propercommunications.2.4.2 Links Between Link CX-24sAs shown in Figure 2.2, the near end Link CX-24 automatically sets up an Ethernet connection to the LinkCX-24 at the far end of each radio system, or link. In Ethernet models, the in-band Ethernet connectionuses the payload data Ethernet link, while in DS-3 models the Ethernet connection is out-of-band, anddoes not interfere with the DS-3 payload data. Because the Link CX-24-to-Link CX-24 Ethernetconnection cannot be turned off, make sure you do not connect both ends of the Link CX-24-to-Link CX-24 to the Ethernet. This will help prevent Ethernet loops and potential data storms. |
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