Product specifications

Exchanging a Defect RCU Link Cables Online Section 5 Maintenance
202 3BSE036351-510 A
Exchanging a Defect RCU Link Cables Online
In Configuration with BC810
If online change proves to be supported, after the caution above has been
considered, and the BC810s are externally supplied with 24V the same steps as in
configuration without BC810 can be followed.
In Configuration without BC810
To exchange a RCU link cable in a redundant CPU configuration, perform the
following steps:
1. Switch OFF the Power for the backup CPU. (Power on the primary CPU must
still be On.)
2. Disconnect the RCU link cable from the backup CPU.
3. Disconnect the RCU link cable from the primary CPU.
4. Attach the new RCU link cable to the primary CPU, note the UPPER
orientation on the cable.
5. Attach the other end of RCU link cable to the backup CPU.
6. Switch ON the Power to the backup CPU.
Do not replace the RCU link cable online in a previous version than 5.0. The
support for online replacement also depends on hardware Product Revision
levels. Please consult Release Notes (3BSE021377*) for detailed information.
Do not leave the primary CPU with the RCU link cable disconnected for a
prolonged time. If a power fail occurs while the cable is disconnected, the
primary CPU cannot perform a startup when the power come back.
The new cable-ends must be connected to the redundant CPUs (exactly) in the
same way as the replaced cable was. Thus, the UPPER mark on the cable-end
must be located to the same CPU as before the exchange.