Chapter 1. Introduction61200410L1-1 ESU LT User Manual 1-3ESU LT Features• An E1 interface and an Nx56/64 DTE serial interface port.• Easy configuration capabilities using simplistic menusdisplayed in a liquid crystal display (LCD) window oper-ated by a front panel keypad.• Data port supports V.35, EIA-530, V.36 and X.21 electricalinterfaces.• Selectable timing from the network, the Nx56/64 DTEport, or internally.• All ones, all zeros, 511, QRSS, and 1:8 test patterns.• Extensive self-testing and monitoring ensures proper op-eration.• Flexible channel allocation (any starting channel and al-ternate or contiguous).ESU LT InterfacesThe ESU LT is equipped with four interfaces:• E1 Network interface per ITU G.703• Nx56/64 high-speed, multiprotocol serial interface• Control input (EIA-232)/Chain port input• Chain port outputSee Figure 1-3 and the following descriptions in this section.Figure 1-3. ESU LT InterfacesESU LT ESU LT
