Chapter 1 Product Description LAN Ethernet Bridge E1/T1 RS232 Loop-E 1500 E1/T1 E1/ T1 E1/T1 Loop-AM 3440 E1/T1 In-band Management Figure 1- 2 Loop-AM 3440 Application Illustration 2 of 2 1-3 U- Interface : : : HDSL- Interface : : : DTE- Interface