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External Time Reference (ETR)
Connectivity Information
|
ETR Reference
ETR ESCON Duplex Port
ETR ESCON Duplex Port
Figure 6-7. ETR Card
Ordering ETR Cables
6-14
zSeries 800: Installation Manual for Physical Planning
The External Time Reference function is part of the processor in the zSeries 800
system. There is an ESCON duplex port on each ETR card for the cable connection
to a Sysplex Timer. Each ETR card should connect to a different Sysplex Timer in
an Expanded Availability configuration.
v Cable is multimode 62.5 micron fiber optic
v Cable connector is ESCON Duplex
v See Fiber Optic Links Planning (ESCON, FICON, and Coupling Links),
GA23-0367 for information about link distances and light loss budget.
The following illustration shows the ETR cards, the channel ports on the cards, and
the type of fiber optic connector that plugs to the channel ports.
Two ESCON Duplex cables for the ETR feature on the zSeries 800 system will
automatically be added to any zSeries Fiber Cabling Service contract offered by
IBM Global Services. Contact your local IBM Installation Planning Representative,
IBM zSeries 800 Product Specialist, or IBM Connectivity Services Specialist for
details. If you choose not to use this Service, you may purchase the two ESCON
Duplex cables separately, or provide them yourself from another source.
ETR ESCON Duplex Connector
External Time Reference
(ETR)
Cards
ETR ESCON Duplex Connector
Level 04a, June 21, 2004
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