接入交换单元作为全光网核心汇聚单元与光馈扩展单元的节点，具有承上启下的作用，为核心层和扩展层之间提供光传输通道，完成光信号的双向传输。它能够处理来自核心汇聚单元的所有通信量，为整个光网提供一个高速、安全与具有QOS（服务质量）保障能力的数据传输环境，并将其进行平等转发及选路提供到扩展单元
As the node of the core aggregation unit and the optical feed expansion unit of the all-optical network, the access switching unit plays the role of connecting the upper and lower levels, providing an optical transmission channel between the core layer and the expansion layer, and completing the two-way transmission of optical signals. It is capable of handling all traffic from the core aggregation unit, providing a high-speed, secure, and QOS (Quality of Service) data transmission environment for the entire optical network, and providing it to the expansion unit with equal forwarding and routing
接入交换也是核心汇聚的输出点，作用是将扩展单元接入节点统一出口，它能够处理来自接入层设备的所有通信量，并提供到核心层的上行链路。因此汇聚层交换机与接入层交换机比较，汇聚层交换机需要具备高转发性能，通常也是三层交换机，因此接入交换单元需要更高的性能，更少的接口和更高的交换速率。
The access exchange is also the output point of the core aggregation, which is used to unify the exit of the extension unit access node, which can handle all the traffic from the access layer devices and provide the uplink to the core layer. Therefore, compared with access layer switches, aggregation layer switches need to have high forwarding performance, usually Layer 3 switches, so the access switching unit needs higher performance, fewer interfaces, and higher switching rates.
光纤作为传输介质，具备低时延、低损耗、抗干扰等优势，确保通信信号的稳定传输。
As a transmission medium, optical fiber has the advantages of low delay, low loss, and anti-interference to ensure the stable transmission of communication signals.
通过核心汇聚单元把射频信号转为光信号。实现全光网络传输，确保通信信号的高质量传输。
The RF signal is converted into an optical signal through the core aggregation unit. Realize all-optical network transmission to ensure high-quality transmission of communication signals.
执行下行帧串行信号的光/电转换并进行波分复用
Perform optical/electrical conversion of the downlink frame serial signal and perform wavelength division multiplexing
接受并调制异步传输的信元以产生下行帧，并转换下行帧的并行数据为串行数据
Accepts and modulates asynchronously transmitted cells to generate a descending frame, and converts the parallel data of the descending frame into serial data
| 型号/Model | GM5300H |
|---|---|
| 应用层级/Application level | 三层 |
| 传输模式/Transmission mode | 支持全双工 |
| 频率范围/Frequency range | 80～470MHz |
| 带宽/bandwidth | 20MHz（频率可定制） |
| 光接收灵敏度/Light reception sensitivity | >-20dBm |
| 光通路/Light pathway | 数字光 |
| 射频输入信号/RF input signal | -5--10dBm |
| 射频输出信号/RF output signal | <0dBm |
| 光功率/Optical power | －5dBm |
| 工作电压/Operating voltage | 5-12V DC或220V AC |
| 光接口/Optical interface | FC/APC或LC/UPC |
| 光接口数量/Number of optical interfaces | 1/8 |
| 尺寸(高X宽X深)/Dimensions (HxWxD) | 88.9×483×383mm |
| 工作温度范围/Operating temperature range | -40℃～80℃ |
