Abstract: A condensing gas boiler, which recollects condensed latent heat by uptrend combustion, is provided. Latent heat exchangers are disposed in the same area as that of a combustion chamber, and perpendicular with the combustion chamber. An exhaust gas guiding member is installed so that the exhaust gas is collected into a place in the rear portion of a latent heat portion to then pass through the latent heat exchangers. The latent heat exchangers are installed slantly in such a manner that re-absorption of the condensed latent heat can be done in the latent heat exchangers under the optimal condition. Thus, the condensing gas boiler, which recollects condensed latent heat by uptrend combustion, can realize a product of a high efficiency, lightness and compactness.

Abstract: A point-to-multipoint communication system includes a central telephony unit having at least one telephony module interface coupled to at least one set of telephony modules. Each set of telephony modules includes a predetermined number of telephony modules connected in a daisy chained configuration. Each telephony module includes a plurality of terminal communication equipment interfaces which allow a corresponding number of terminal communication equipment to be coupled to each and every telephony module. Each terminal communication equipment responds to a unique terminal communication identifier which is transmitted with each message from the central telephony unit. The point-to-multipoint communication system includes a configuration mode which allows the system to automatically map its configuration including the number of telephony modules in each set and the number of terminal communication equipment coupled to any one telephony module.