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-----Mensaje original-----
De: IBM Mainframe Discussion List [mailto:[email protected]] En nombre de 
Noshir Dhondy
Enviado el: jueves, 20 de agosto de 2009 14:48
Para: [email protected]
Asunto: Re: Synchronizing TOD between mainframe and other platforms

It is not possible to have the Sysplex Timer (9037) attach to non-S/390 or 
zSeries servers. However, there is a way that customers can get the same time 
across both zSeries and non-zSeries servers in their data center. The
9037 can attach to an External Time Source (ETS), the options are described in 
the 9037 Model 2 planning manual as well as the Redbook SG24-2070. The
9037 attachment to an ETS supports 3 possible RS-232 protocols.

To get the same time across zSeries and non-zSeries, a potential solution is:

The customer uses an NTP server that also has the RS-232 protocols supported by 
the 9037. These NTP servers are available from multiple vendors - one example 
is the Symmetricom SyncServ S250.
                                                                       
http://www.symmetricom.com/products/ntp-servers/ntp-network-appliances/SyncServer-S250/

Input options for these devices includes GPS, IRIG-B and the USA NIST ACTS
telephone service.                                                             
                                                                       
Outputs for this device includes an Ethernet NTP (Network Time Protocol) Time 
Server as well as the necessary EIA-232 serial time code for the 9037, the 
former could connect to their non-S390 or non-zSeries servers and the latter to 
the 9037.  This would allow a customer to have the same external time source 
for both a S/390 or zSeries server and a non-System z server. 

Note that this does not provide the kind of synchronization that is required in 
a zSeries or S/390 Parallel Sysplex. However, it will allow the customer to 
have the enterprise running on the same time standard and therefore coordinate 
time stamps, etc.

The above product is not necessarily the only one that provides this 
capability. Other Symmetricom models also provide this function, and if you 
want a second source for your External Time Source that provides similar 
function please do your own research to find another vendor. Other vendors I am 
aware of that provide this capability are Meinberg, Spectracom.


Noshir Dhondy ([email protected])

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