多頻段POI (Point Of interface)是一個多頻段的合路器,將許多不同頻段的射頻信號混合為四個迴路至天線系統.

合路器一般用於發射端，其作用是將兩路或者多路從不同發射機發出的射頻信號合為一路送到天線發射的射頻器件，同時避免各個埠信號之間的相互影響。 

 合路器一般有兩個或多個輸入埠，只有一個輸出埠。埠隔離度是一個比較重要的指標，用於描述兩路信號互不影響的能力。

Multi-band POI (Point Of Interface) is a multi-band combiner that mixes RF signals of many different frequency bands into four loops to the antenna system.

The combiner is generally used at the transmitting end, and its function is to combine two or more radio frequency signals from different transmitters into one radio frequency device sent to the antenna for transmission, while avoiding the mutual influence between the signals of each port.

The combiner generally has two or more input ports and only one output port. Port isolation is a relatively important indicator used to describe the ability of two signals to not affect each other.

在電信領域，接口點 (POI) 用於顯示兩個不同運營商之間的物理接口。

POI（Point Of Interface）作為室內覆蓋多網融合的核心設備，POI（Point Of Interface）採用多頻低損耗合路技術，對運營商的上下行射頻信號進行有效合分，可以保證系統無失真合路器傳輸上下行信號，各網絡信號互不干擾，不同系統共用一個室內分佈式系統。

POI作為強大的多路合路器，是一種綜合可靠的無源器件，用於信號集成和傳輸。由於不同的運營商為他們的客戶提供各自的頻率範圍，而客戶可以不受頻率限制地與人自由互動，因此應該有一個智能係統來盡可能地適應移動通信——這就是 POI 的作用。配合直放站設備，可以不受操作者限制地定制頻率接口，同時向樓層、建築物等傳輸組合穩定的信號。

適用於LTE TDD、LTE FDD、TD-SCDMA、CDMA、GSM、DCS、WCDMA（UMTS）、WLAN等移動通信、專用集群通信、電信接入網等系統。

• 整個室內覆蓋系統利用率高，資金成本低。

• 綜合成本低，系統具有可擴展性和可擴展性。

• 高互調，可抗大功率。 

• 易於安裝。

In telecommunications a point of interface (POI) is used to show the physical interface between two different carriers.

POI（Point Of Interface）As the core device of multi-network integration for indoor coverage, POI (Point Of Interface) uses multi-frequency low-loss combiner technology to carry out effective combination and division of uplink and downlink RF signals of operators, which can ensure that the system distortion-less combiner transmits uplink and downlink signals without interference among signals in each network, and different systems share an indoor distributed system.

Serving as a powerful multi-combiner, POI is a comprehensive and reliable passive component to signal integration and transmission. Due to different operators provide respective frequency range to their customers, while customers will interact freely with persons despite frequency boundaries, there should be a smart system to accommodate mobile communication as much as possible – this is what POI works for. Partnered with repeater equipment, it can be tailored to frequency interfaces without operator limits, meanwhile transmit combined and stable signal to floors, building, etc.

It is applicable to mobile communications, private trunking communications, telecommunications access network and other systems such as LTE TDD, LTE FDD, TD-SCDMA, CDMA, GSM, DCS, WCDMA (UMTS), WLAN, etc.

 The entire indoor coverage system has a high utilization ratio and low capital cost. 

• The comprehensive cost is low, and the system is extensible and scalable.
• High inter-modulation and can resist high power.
• Easy to get installed.