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Precautions when handling plug-in units

Electrostatic Precautions (ESP)
Use Electrostatic Precautions (ESP) when you handle plug-in units. An approved ESP equipment makes a resistive connection, ensuring your safety and preventing a sudden static discharge during the connection to the earthing point. This means that you must be earthed to the equipment racks with an approved wrist strap and
a connecting lead.

The ESP equipment must be continuity-tested before use.

Removing or inserting a plug-in unit connected to DMC bus
Before removing or inserting a plug-in unit connected to the DMC bus, switch off the cartridge’s power supply. If you remove or insert a plug-in unit when the cartridge’s power supply is on, it may damage the plug-in unit.
Note
In BSC3i there is no need to switch off the power supply if the plug-in unit being replaced has a Hot Swap functionality.
Do not insert the plug-in unit in two movements, for example by first pushing it near the bottom (partial contact) and then all the way to the bottom. This can cause disturbances in the operation of the network element, or in the worst case,damage the plug-in unit.
Caution
Electrostatic discharge (ESD) and incorrect installation and uninstallation can damage the circuits or shorten their lifetime. To ensure the proper functioning of the plug-in units during their usual lifetime, take the following precautions before handling them.
. Before touching the integrated circuits, ensure that you are working in an electrostatic-free environment.
. Wear an ESD wrist strap or use another corresponding method to discharge static electricity from your body.

Plug-in unit spares
Always check the compatibility of the plug-in unit spares before changing a faulty plug-in unit. This means that you must check the interchangeability and the strappings of the plug-in unit.
Check the strappings according to the Jumper Settings of the Plug-in Units in BSC3i and the interchangeability according to the Base Station Controller and Transcoder, Hardware Revisions List available in Nokia Online Services (NOLS).
The plug-in units must be transported to and from the spare cabinets in the packaging provided.

By maintaining a log of spares you can trace any plug-in unit any time.

Controller plug-in units of the peripheral device
The instructions given in Section Replacing a plug-in unit also apply to the SCSI and SERO controller plug-in units of the peripheral equipment.
Always check the interchangeability of the spares before changing a faulty plug-in unit.
The interchangeability code, version number, and variant identifier of the plug-in unit are on the label attached to the front panel of the plug-in unit.
For information on strappings, see Jumper Settings of the Plug-in Units in the Site Documents binder.

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