We describe analytical formalism for estimating neutron radiative capture and elastic scattering cross section covariances in the resolved resonance region. We use capture and scattering kernels as the starting point and show how to get average cross sections in broader energy bins, derive analytical expressions for cross section sensitivities, and deduce cross section covariances from the resonance parameter uncertainties in the recently published Atlas of Neutron Resonances. The formalism elucidates the role of resonance parameter correlations which become important if several strong resonances are located in one energy group. Importance of potential scattering uncertainty as well as correlation between potential scattering and resonance scattering is also examined. Practical application of the formalism is illustrated on 55 Mn(n,γ) and 55 Mn(n,el).

The SLC*‐96 system is a digital subscriber carrier system that can carry up to 96 subscriber channels, when fully equipped, between a Central Office Terminal (cot) and a Remote Terminal (rt), using T1 digital lines. Typical economic applications are for expanding the service capability of existing cable plant or for new wire center deferral. Recent application studies show that SLC‐96 systems will be economically attractive in many permanent subscriber applications. In addition to Message Telephone Service (mts), the system can provide coin services, voice‐frequency special services, and digital data services. The SLC‐96 system is based on the transmission and physical format of the D4 system used for interoffice trunks. The system employs μ255 pulse code modulation (pcm) for voice transmission and, as a result, will allow the direct interface of the rt with a digital central office. Its maintenance features include channel and drop testing from a local test desk; single‐ended, active, T1 fault‐locating; automatic T1 line protection; extensive local and remote alarm displays; and outputs that can be transmitted to a remote operations center such as the Switching Control Center (scc). The channel and drop testing scheme requires a Pair Gain Test Controller (pgtc) to be installed in each wire center containing one or more SLC‐96 systems. Various other features that will enhance the application of the SLC‐96 system in the loop plant include extended range channel units, remote T1 line power feed, and a variety of RT enclosures.

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