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论述了天津发展Ｂ＿ＩＳＤＮ的必要性及其构成Ｂ＿ＩＳＤＮ的三个基础网络，提出了天津建设Ｂ＿ＩＳＤＮ的有关建议。
The necessity of developing B_ISDN in Tianjin and the three basic networks that constitute B_ISDN are discussed. Proposals on the construction of B_ISDN in Tianjin are put forward.