Functional description 867Foreign and surge voltage protectionLightning protectors must be installed between an external T1 carrier facilityand the system. For public T1 facilities, this protection is provided by thelocal operating company. In a private T1 facility environment (a campus, forexample), the NTAK92 protection assembly can be used.The NTAK09 circuit card conforms to safety and performance standards forforeign and surge voltage protection in an internal environment.Lightning protectors must be installed between an external T1 carrier facilityand the Option 11C cabinet. For public T1 facilities, this protection isprovided by the local operating company. In a private T1 facility environment(a campus, for example), the NTAK92 protection assembly may be used.The NTAK09 circuit card conforms to safety and performance standards forforeign and surge voltage protection in an internal environment.Lightning protectors must be installed between an external T-1 carrier facilityand the CS 1000 system. For public T-1 facilities, this protection is providedby the local operating company. In a private T-1 facility environment (acampus, for example), the NTAK92 protection assembly can be used.The NTAK09 circuit card conforms to safety and performance standards forforeign and surge voltage protection in an internal environment.Functional descriptionNTAK09 provides the following features and functions:• configurable parameters, including A-Law and μ-Law operation, digitalpads on a per channel basis, and Superframe or Extended Superframeformats• AMI or B8ZS line coding• 1.5 Mb Clock recovery and distribution of reference clocks• DG2 or FDL yellow alarm methods• card status and alarm indication with faceplate-mounted LEDs• automatic alarm monitoring and handling• Card-LAN for maintenance communication• loopback capabilities for both near-end and far-end• echo canceler interface• integrated trunk access (both D-channel and in-band A/B signaling canbe mixed on the same PRI)• faceplate monitor jacks for T1 interfaceNortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
