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首先看你纤芯资源如何?如果有直达光纤且资源比较富裕的话，站点暂无传输设备的情况下可以直接用光纤直驱方式连接。

长远来看，上联交换机通常是作为OLT汇接用的，通常情况下交换机处是有传输资源的，如果OLT点紧紧是单台设备，那么如果光纤资源足够，直接上联相对来说投资划算些，如果OLT点还放置了其他业务设备，或者以后可能会新增OLT设备，那当然使用传输设备上联能大幅度节约光纤资源，并且以后也要考虑OLT上行板卡扩容问题，加上这么远的距离，长远来看，用传输设备是划算的。

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