H3C S5120-28P-SI 交换机光模块不发光

光模块是华三的，而且确定好的， S5120-28P-SI 交换机1-24口是电口，25-28口是光口，我在1口上插上网线，25口插上光模块，并在G1/0/25口里敲了undo shutdown，但是25口还是DOWN起的，光模块无光发出。我又试了下combo enable fiber命令，显示错误，压根没这个命令，求大神帮帮，谢谢，下面是26口的状态。

GigabitEthernet1/0/26 current state: DOWN IP Packet Frame Type: PKTFMT_ETHNT_2, Hardware Address: 5866-bac6-c130 Description: GigabitEthernet1/0/26 Interface Loopback is not set Media type is optical fiber, Port hardware type is 100_BASE_LX_SFP Unknown-speed mode, unknown-duplex mode Link speed type is autonegotiation, link duplex type is autonegotiation Flow-control is not enabled The Maximum Frame Length is 10240 Broadcast MAX-ratio: 100% Unicast MAX-ratio: 100% Multicast MAX-ratio: 100% PVID: 1 Port link-type: access Tagged VLAN ID : none Untagged VLAN ID : 1 Port priority: 0 Last clearing of counters: Never Peak value of input: 0 bytes/sec, at 00-00-00 00:00:00 Peak value of output: 0 bytes/sec, at 00-00-00 00:00:00 Last 300 seconds input: 0 packets/sec 0 bytes/sec -% Last 300 seconds output: 0 packets/sec 0 bytes/sec -% Input (total): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses Input (normal): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses Input: 0 input errors, 0 runts, 0 giants, - throttles 0 CRC, 0 frame, 0 overruns, 0 aborts - ignored, - parity errors Output (total): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses Output (normal): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses Output: 0 output errors, - underruns, - buffer failures 0 aborts, 0 deferred, 0 collisions, 0 late collisions - lost carrier, - no carrier