Dear fellows: Often people can find a 'ESD frame ground' (ESD - ElectroStatic Discharge) surrounding the PCB of each Slide-in card in the telecommunication equipment, are there any friends being capable of offering me some theoretical materials on this subject? Appreciate. Dr. Chi-Fang Huang 12F-2, #8 Hsin-Hai Rd., Sec. 1 Taipei, TAIWAN Office: Siemens Telecommunication Systems, Ltd. tel - 02-25186566 fax - 02-25053866 (by attention "Dr. Chi-Fang Huang (D520)") ################################################################ DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################