Above - Baseline Electrical Protection for Designated Telecommunications Central offices and Similar-Type Facilities Against High-Altitude Electromagnetic Pulse (HEMP)
Telecommunications facilities covered This above-baseline standard applies to central offices and similar-type facilities in public telecommunications networks in which a special measure of resistance to damage from high-altitude electromagnetic pulse (HEMP) is desired. It describes electrical protection measures that extend beyond the baseline-level measures against the normally encountered electromagnetic threats included in T1.308-1996 (R2002) and T1.313-2003. The measures of this standard are intended for telecommunications facilities that contain electronic communications equipment@ including switching centers@ central offices@ signal transfer points@ head-ends@ Electronic Equipment Enclosures (EEE)@ routers@ and any other subsystem upon which the call process is dependent. Application of protection measures This standard is intended to provide practical and cost-effective electrical/electromagnetic protection measures that will impart a basic level of protection against HEMP for central offices and similar type facilities of public telecommunications networks (PTN). It presents a background of generalized measures to be applied to a specific site. The protection measures of this above-baseline standard shall be negotiated with each individual service provider (local exchange carrier@ interexchange carrier@ etc.) as each situation arises. Measures not covered This standard does not cover the specialized and comprehensive measures that would be needed for near- absolute immunity to HEMP on special-purpose@ hardened telecommunications routes. Detailed site-specific measures are beyond the scope of this standard and are subject to negotiation between user and supplier. The measures described in this standard apply at the facility level@ and do not provide techniques for the protection of specific network equipment or components.