Be sure that the host computer operating system and associated applications programs have been properly loaded and started. If host communication is restored, service the standby controller. Cabling Cabling refers to the general wiring practices used to complete the physical connection between a host communications port and a DB-15 Ethernet port. Physical Ethernet connections are determined by the network environment. Route cables away from sources of EMI and RFI noise which might induce spurious signals.
Induced noise can cause erratic system performance, including loss of service.
Remove breakout boxes or other adapters and line analyzers from communications links as soon as possible. Modems Modem setup parameters are dictated by the type of interface, communication protocol, cabling requirements, and answering mode required for the intended application. If the modems are connected over the switched public network or leased data lines, you must also contend with problems of noise, line losses and other problems common to data communications over analog networks. Traffic throughput requirements affect the CPU overhead required in the host computer. Host communications links must be operated and serviced in real time.