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T3 Interfaces Overview


T3 is the physical layer protocol used by the Digital Signal level 3 (DS3) multiplexing method in North America. A T3 interface operates at a bit rate of 44.736 Mbps. The Junos OS supports payload scrambling and subrate operation on each physical T3 interface. One encapsulation format—Point-to-Point Protocol (PPP), Frame Relay, or High-level Data Link Control (HDLC)—must be configured for the interface. DS3 standards supported include:

  • ANSI TI.107, TI.102

  • GR 499-core, GR 253-core

  • Bellcore TR-TSY-000009

  • AT&T Pub 5404

  • ITU G.751, G.703, G823

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