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The Cisco Transport Node Controller (TNC) and Transport Shelf Controller (TSC) and the enhanced versions (TNCE and TSCE, respectively) are next-generation system processors for the Cisco ONS 15454 M6 and ONS 15454 M2 Multiservice Transport Platforms (MSTPs) and the Cisco Carrier Packet Transport (CPT) 600 and CPT 200 platforms. The Cisco TNC, TNCE, TSC, and TSCE cards perform system initialization, provisioning, alarm reporting, maintenance, diagnostics, IP address detection and resolution, SONET and SDH data-communications-channel (DCC) termination, system DC input-voltage monitoring, and system fault detection, and they support multishelf connections. The TNC and TNCE cards also have two optical service channels that support a supervisory data channel (SDC), distribution of synchronous clocking, and a 100-Mbps user data channel (UDC). The enhanced versions, TNCE and TSCE, support the IEEE1588v2 Precision Timing Protocol (PTP) and time of day (ToD) with pulse per second (PPS), in addition to support for Synchronous Ethernet (SyncE)/Source Specific Multicast (SSM) and traditional SONET and SDH Building Integrated Timing Supply (BITS) timing, which the TNC and TSC also support. The cards reside in slots 1 and 8 in the Cisco ONS 15454 M6 and Cisco CPT 600, and slot 1 in the Cisco ONS 15454 M2 and Cisco CPT 200. In the Cisco ONS 15454 M6 and Cisco CPT 600, the card can be equipped as active and standby, providing 1:1 equipment protection. In the Cisco ONS 15454 M2, ONS 15454 M6, CPT 200, and CPT 600, a single card is used in simplex mode.