用于 HDM3310总线消防电话总机间的网络连接，具有 A/B端，可各连接 1台消防电话总机的通讯总线，实现数

字通信和语音信号的路由传输。 ★ 由通讯总线为网络路由器进行供电，无需外接电源，工作电压范围为DC24V±4V。 ★ A/B端在各自接入的通讯总线系统中各占 1位编码地址，有工作灯指示巡检状态。 ★ A/B端采用隔离电路设计，可减小通讯总线噪声串扰。 ★ A端适于连接中心控制消防电话总机，而 B端连接其他分区的消防电话总机。 ★ 金属外壳，不易损毁，抗干扰能力强。

★ Used for networking two or more HDM3310 addressable telehphone exchange, designed side A and B,

which connect bus-line of two exchanges respectively and realize bridging and networking voice and

digital signal. ★ Power supplied by exchange bus-line, no additional power source needed, rated voltage range: DC18­

DC26V ★ Isolated design between Side A and Side B, to minimizing crosstalk noise. ★ Side A is designed to connect to central control exchange, side B connects to other exchange. ★ Metal shell, not easy to broke, has strong shock resistance and anti-jam capability.