AT&T System 25 - Manual (Page 179)

MAINTENANCE
Precautions
Electromagnetic fields radiating from the system cabinets may generate noise
in other communications equipment. The technician must be sure that all
cabinet panels and covers
are securely in place after performing
maintenance.
Caution: Electrostatic discharge can destroy or severely damage
integrated circuits on CPs.
The maintenance technician MUST ALWAYS WEAR A WRIST GROUNDING
STRAP when handling CPs.
The cord must be attached to the grounding
block at the back of the cabinet. Damage to integrated circuits caused by
electrostatic discharge may not be immediately apparent.
Caution: The wrist grounding strap must
cabinet location other than the
front-cover retainer screw. The
must not be attached to a CP.
not be clipped to any
grounding block or a
wrist grounding strap
4-3