EMC/ESD information

Required connections

The system was developed in compliance with the ETSI Mesh Ground requirements. This means EMC compliance and personnel safety can be achieved only if the system is connected to a System-Reference Potential Plane (SRPP) at many places as described in ETS 300 253 (see the figure below).

All peripheral equipment and its protective earth/ground must also be connected to the SRPP by one or more fixed wires.

The EMC/ESD boundary is defined at unit level. The principle is based on the “Faraday Cage” theory. If there are covers, then the covers must be closed.

Every rack provides an ESP bonding point to which a wrist strap can be connected.

Option card and SFP handling

The following ESD instructions must be observed when handling option cards and/or SFPs:

• Wear working garment made of 100% cotton to avoid electrostatic charging.

• Touch the option cards/SFPs at the edges only.

• Ensure that the 1643 AM and 1643 AMS units are grounded.

• Wear conductively connected wrist straps and connect them to an ESP bonding point.

• Work in an area which is protected against electrostatic discharge. Use conducting floor and bench mats which are conductively connected to an ESP bonding point.

• Conductively connect all test equipment and trolleys to an ESP bonding point.

• Store and ship the option cards/SFPs in their shipping packing. The option cards/SFPs must be packed and unpacked only at workplaces suitably protected against build-up of charge.

• Whenever possible, maintain the relative humidity of air above 20%.