The Cisco 1-Port CHOC-12 ISE line card is built on the Cisco IP Services Engine (ISE) technology designed for telcos and Internet service providers (ISPs), the line card can channelize an STS-12 or STM-4 signal into a maximum of 70 channel groups per supported path (STS-1, TUG-3, or AU-3), with up to 840 channel groups of DS1, fractional DS1, or n x DS0 signals. (That is, 12 paths per line card with 70 channel groups maximum per path). The line card also supports up to 168 Multilink Frame Relay (MLFR) or Multilink Point-to-Point Protocol (MLPPP) T1 bundles, each of which supports up to 8 DS1 channel groups. The concatenated, or unchannelized SONET and SDH modes are not supported.The Cisco 1-Port CHOC-12 ISE card supports four quality of service (QoS) queues per channel group or T1 bundle, with Weighted Random Early Detection (WRED) and Modified Deficit Round Robin (MDRR). For traffic with low-latency requirements such as voice over IP (VoIP), the line card supports link fragmentation and interleaving (LFI) and the FRF.12 standard protocol. The Cisco 1-Port CHOC-12 ISE Line Card can be used in any of the Cisco 12000 Series Routers and supports "hitless" online insertion and removal (OIR).