HP 81200 Installation Manual page 33

Setting up an Extended HP 81200 System based on HP E4849A/B and HP E4848A/B Mainframes
6. Connect the flat cables from Extender 1 and Extender 2 into the connectors on the main board of
the HP E4805A Central Clock module which goes into the Master mainframe.
Figure 23 Connect Flat Cables coming from Extender 1 and Extender 2
7. Carefully refit the side panel again, start with the middle screw of the three ones which are close to
the front panel. These three screws are short ones (5 mm). The other four screws are long ones
(14 mm).
8. Plug in the HP E4805A Clock module into its place in the Master mainframe.
9. Re-connect all clock cables which go to the HP E4841A modules in the Master mainframe.
10. Now connect the two clock distribution cables which go from the Master mainframe's HP E4805A
Clock Module Extender Connection to Extender 1 and Extender 2 mainframes, see next figure.
The clock cable connects to Extender OUT in the Master mainframe and to Extender IN in the
Extender mainframes.
Figure 24 Clock Reference Distribution of the Extended HP 81200 System
Clock Distribution to
E t d 2
Setting up a proprietary System
Flat cable from
Extender 1
Flat cable from
Extender 2
Clock Distribution to
Extender 1
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