2 x C37.94 compliant SFP ports (LC, MM); 2 x E1 RJ45 ports; E1 (2.048 Mbps) compliant with ANSI T1.102, OFTEL OTR001 and ITU-T recommendations G.703 and G.823; 64 kbps cross connect per card; Up to 16 independent circuit emulated streams; CESoPSN and SAToP circuit emulation packet formats; Hitless switching (zero packet loss with 1+1 protection); Support for hair pinning mode (C37.94 to E1) without circuit emulation on a single card; Testing: Loopback, BERT; LAN operation