General Precautions; Floor Space Preparation; Tests; Esd Consequences - Lucent Technologies SLC-2000 Remote Terminal Assembly Manual

363-208-010
General Information

Floor Space Preparation

Installation work can begin before the arrival of the SLC -2000 RT Frames. The
floors can be predrilled using a template derived from footprint figures in Chapter
2, Installation Procedures. Completion of other advance work before the arrival of
the equipment (extensions for the cable rack, aisle lighting, and appliance outlets)
would further reduce the installation interval.

Tests

The test procedure in this manual consists of voltage readings and wiring
continuity checks only. The turn-up and acceptance tests are covered in the SLC -
2000 User/Service Manual, Lucent Technologies Practice 363-208-001.
The turn-up tests may be performed when all activities covered in this installation
manual are completed.

General Precautions

ESD Consequences

Semiconductor devices and circuit packs, in general, are sensitive to static
charges. Most circuit pack integrated circuit (IC) damage can be attributed to a
discharge of static electricity.
For a person to feel the discharge of static electricity, a minimum level of 3500
volts must exist. A person walking across a floor can generate electrostatic
voltages in excess of 5000 volts. Tests have shown that ICs can be damaged by
discharges of less than 100 volts. Since ESDs contain little or no current, there is
no employee safety hazard.
In addition to ESD resulting from an ungrounded person touching a circuit pack,
static discharges may result from other sources. If a piece of plastic is placed near
one end of a circuit pack lying on an insulated table top, it can direct its charge into
the circuit pack.
Identifying ESD damage can be difficult because in most cases, physical damage
cannot be seen. A circuit pack which has been exposed to an ESD may:
Not be affected, i.e., work perfectly with normal life expectancy
Function normally, but with reduced life expectancy
Function erratically at times
Stop functioning altogether
1-2
Issue 5 May 1997