HP 81200, Installation Manual, Page: 31 / 76

Setting up a proprietary System
Setting up an Extended HP 81200 System based on HP E4849A/B and HP E4848A/B Mainframes
31
Clock Reference Interconnection
Tools Required
You need a flat screw driver and a TORX No. 362 screw driver. A TORX screw driver is attached to
the shipment.
Steps to perform
Each of the mainframes is equipped with an HP E4805A Central Clock Module. Use the delivered
clock distribution cables (p/n E4805-61601, the cables are already connected to the clock module in
the Extender mainframes) to connect from one HP E4805A module in one mainframe to the other HP
E4805A module in the other mainframe. Up to two additional mainframes can be connected.
It is necessary to unplug the HP E4805A Central Clock Module from the Master mainframe, open the
side panel and connect the flat cable from Extender 1 and Extender 2 into the connectors on the main
board of the module.
1. In the Master mainframe, disconnect all clock distribution cables to the HP E4841A modules
going from the Central Clock module of the Master mainframe.
Figure 20 Disconnect all Clock Distribution Cables from the Clock Module
2. Unscrew the two screws, on top and bottom of the front panel of the HP E4805A Clock Module,
which secure the module to the mainframe. A flat screw driver is required.
3. Remove the HP E4805A Clock Module from the Master mainframe.
Disconnect all Clock Cables
from the HP E4805A Central Clock Module
This ends of the clock cables can be kept connected