326 NT5D97 Dual-port DTI2 PRI2 cardDANGERDANGER OF ELECTRIC SHOCKThe NT5D97 DDP2 card is not designed to be connecteddirectly to the Public Switched Network, or other exposed plantnetworks. Such a connection should only be done using anisolating-type networking terminating device that provides voltagesurge protection, such as a Line Terminating Unit (LTU), NetworkChannel Terminating Equipment (NCTE), or Network Termination1 (NT1), as certified by your local, regional, or national safetyagency and telecommunication authority.Physical descriptionExternal D-Channel Interface DCH or MSDLThe connection between the DDP2 card and the external DCH or MSDL isthrough a 26-pin female D type connector. The data signals conform to theelectrical characteristics of the EIA standard RS-422.Two control signals are used to communicate the D-channel link statusto the DCH or MSDL. These are:• Receiver Ready (RR), originating at the DDP2 card, to indicate to theDCH or MSDL that the D-channel link is operational.• Transmitter Ready (TR), originating at the DCH or MSDL, to indicate tothe DDP2 card that the DCH are ready to use the D-channel link.Table 134 "DCH/MSDL Receiver Ready control signals" (page 326) indicateshow the RR control signal operates with regard to the DDP2 status.Table 134DCH/MSDL Receiver Ready control signalsRR State ConditionON • D-Channel data rate selected at 64 Kbps.• PRI2 loop is enabled.• PRI2 link is not in OOS or Local Alarm mode state.• PRI2 link is not transmitting a Remote Alarm pattern.• PRI2 link is not receiving a Remote Alarm Indication from aremote facility.OFF All other conditionsNortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
