September 2002
Intermediate to advanced
332 pages
11h 1m
English
Content preview from IBM eServer zSeries 900 Technical Guide
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Chapter 3. Connectivity 143
3.8.1 Connectivity
This section describes the ETR connectivity of the z900 server.
OSC/ETR
Two OSC/ETR cards are standard on the z900 server. These cards provide the main
oscillator for the z900 server, including the Self Timed Interface (STI), reference, and Memory
Bus Adapter (MBA) clocks. They also provide the I/O for the External Time Reference
connection to one or two 9037 Sysplex Timer Units.
The two standard OSC/ETR cards are located in the CPC cage of the z900 server. Each card
has a single port supporting an MT-RJ fiber optic connector to provide the capability to attach
to a 9037 Sysplex Timer Unit. The MT
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