IBM zSeries 800 Installation Manual

Also see for 800: Parts manual Product overview

Contents

External Time Reference (ETR)The External Time Reference function is part of the processor in the zSeries 800system. There is an ESCON duplex port on each ETR card for the cable connectionto a Sysplex Timer. Each ETR card should connect to a different Sysplex Timer inan Expanded Availability configuration.Connectivity Informationv Cable is multimode 62.5 micron fiber opticv Cable connector is ESCON Duplexv See Fiber Optic Links Planning (ESCON, FICON, and Coupling Links),GA23-0367 for information about link distances and light loss budget.ETR ReferenceThe following illustration shows the ETR cards, the channel ports on the cards, andthe type of fiber optic connector that plugs to the channel ports.Ordering ETR CablesTwo ESCON Duplex cables for the ETR feature on the zSeries 800 system willautomatically be added to any zSeries Fiber Cabling Service contract offered byIBM Global Services. Contact your local IBM Installation Planning Representative,IBM zSeries 800 Product Specialist, or IBM Connectivity Services Specialist fordetails. If you choose not to use this Service, you may purchase the two ESCONDuplex cables separately, or provide them yourself from another source.ETR ESCON Duplex ConnectorETR ESCON Duplex ConnectorETR ESCON Duplex PortETR ESCON Duplex PortExternal Time Reference(ETR)CardsFigure 6-7. ETR CardLevel 04a, June 21, 20046-14 zSeries 800: Installation Manual for Physical Planning|