Line buildout settings are an inherent part of T1 and T3 network element transmission circuitry. Because cable lengths between network elements and DSX vary in the central office, LBO settings are designed to adjust the output power of the transmission signal to achieve equal level point (ELP) at the DSX. Most network elements allow LBO settings to be adjusted via software or hardware settings. | I R Central Office Line Buildout Settings and Equal Level Point Overview This application note clarifies the function of line buildout LBO settings in the central office network architecture. LBO Functionality in the Network Line buildout settings are an inherent part of T1 and T3 network element transmission circuitry. Because cable lengths between network elements and DSX vary in the central office LBO settings are designed to adjust the output power of the transmission signal to achieve equal level point ELP at the DSX. Most network elements allow LBO settings to be adjusted via software or hardware settings. Purpose of LBO Settings In the central office network LBO settings are designed specifically to establish equal level point at the DSX typically defined as 0dB . The long and short line buildout settings refer to power output levels that correspond to the attenuation characteristics of the cabling between the network element and the DSX. The output power levels associated with LBO settings are not designed to accommodate overall cable lengths near- end NE to DSX DSX to DSX and DSX to far-end NE . By setting the LBOs for all network elements to a standard equal level point at the DSX service providers are able to cross-connect any two network elements at any point in time and achieve an operational transmission path with predictable results. Using LBO to Bypass Equal Level When a network element is initially cabled to the DSX the service provider may not know if the circuit will ultimately be handed to another carrier CLEC or where the far end equipment will be located in the central office. It is possible to make a particular signal work by ignoring equal level point at the DSX and adjusting LBO settings such that the signal is driven to the far-end receiving equipment. However this practice has several negative implications for the network. Service providers cannot be assured of any-to-any circuit compatibility when cross-connecting. This impacts .
