HDM2101消防电话系统是建筑物消防系统中重要的消防设备。多线制消防电话具有工作可靠、施工简单、通话清晰、覆盖范围宽广、易于维护等特点，是当前众多消防通信产品中的主流产品。系统主要由消防设备电源、消防电话主机和多个品种的消防电话分机构成，其中消防电话主机内可装5块用户板，每块用户板可有8个电话分机端口，每个端口可接消防电话分机4部，共计可接消防电话分机32部。另外用户板电话分机端口还可选择多线制消防电话插孔接驳，每个端口最多可接驳6个消防电话插孔，整套系统最多接驳数量不大于1000个，形成较大的消防电话覆盖范围，系统中设有末端检测电阻，用于判断各分路是否出现短路、断路故障，除此以外本系统还设计有其它诸多易于使用、便于安装的人性优异功能。HDM2101 conventional fire telephone system as one key part of emergency communication, is highly reliable, provides high quality of voice and is easy for maintanence. HDM2101 exchange panel may have 8 to 40 loop zones configeration refer to field requirements, every 8 loops are integrated on one loop interface broad, where the exchange panel may have up to 5 loop interface broad. For each loop zone, the system allows to connect 4 telephone extensions or 60 telephone jacks, while 1000 communication spots at total are supported in system.