J.C. Ogbulezie  , M.U. Onuu  , D.E. Bassey  , 
    Assessment of NITEL Exchange, Calabar, Nigeria,
    Journal of Engineering and Applied Sciences,
    Volume 3,Issue 1,
    2008,
    Pages 55-58,
    ISSN 1816-949x,
    jeasci.2008.55.58,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2008.55.58)
    Abstract: Measurements and analyses of telephone in public switches in Calabar were undertaken in Nigerian Telecommunications Limited (NITEL), Calabar exchange. Data collected from 6 routes were analysed. Results show that the answer-bid ratio for the routes was in the range 9.70-47.40, answer-seizure ratio, 10.10-47.80 and call completion ratio, 77.70-100. This means that not up to half the number of calls were effectively carried, thereby implying poor performance compared to international evaluation indices.
    Keywords: NITEL exchange;public switches answer-bid ratio;answer-seizure ratio