In our current oilfield data network, it is based on 100Mbps Ethernet. There is a common problem in practical applications: the maximum transmission distance of twisted pair is only 100 meters, and the office locations of many secondary units are scattered, and as data The network access layer device generally has only one uplink Gigabit optical port to the core layer device. In this case, the optical transceiver is required to convert the electrical signal into an optical signal, and the optical fiber is used to extend the transmission distance of the Ethernet.
As a subordinate unit of the drilling company, the drilling pipe station is assigned an IP address by the Drilling Information Center. It is transmitted from the Baijitan ZXR 103904 switch to the Karamay ZXR 10T64G switch through the two-layer transparent link provided by the communication company, and the data is transmitted through the optical cable. Passed to the Keshi Pipeline Station, and then passed the data from the pipe station to the Keshi Pipe Station through the optical transceiver and optical cable.
Cable break
At the beginning of this year, we received a message from the production station of the pipe station that we were unable to access the Internet. We first checked the Layer 2 link provided for the user. A port was configured in the T64G to be divided into the VLAN of the pipe station. The gateway of the ping pipe station can be pinged. Indicates that the link from the T64G to the Drilling Information Center is normal. Next, check the T64G to the pipe station office and check that the fiber transceivers at both ends are all normal.
Finally, we placed the suspect point on the section of the pipe station and the pipe station production area. The length of this single-mode optical cable is 2.4 kilometers. When the RX (light-receiving) light is on, the TX (light-emitting) light is off, the ACT light is occasionally flashing, and the optical fiber transceiver RX (receiving light) in the production area of ​​the pipe station. The lamp is not lit, the TX (lighting) light is on, and the ACT light is not lit, indicating that only the signal confiscation signal is generated in the production area of ​​the pipe station. Therefore, we exchanged the transceiver fibers at both ends. The phenomenon is that the RX lamp of the pipe station is not bright, the TX lamp is on, the RX lamp in the production area of ​​the pipe station is on, and the TX lamp is not lit. Therefore, we judged that a core fiber cable has failed.
The cable goes through the underground pipeline, and the two ends are used for guiding, and the possibility of human damage is not great. Therefore, we have a higher possibility that the optical terminal boxes or pigtails at both ends have a problem, so the pigtails are re-spliced ​​and the terminal boxes at both ends are made. After the test, the red light pen is used for testing, and both cores can receive light, indicating that the terminal box, pigtail fiber, and fiber optic cable are all normal.
After the optical transceiver is connected, the light receiving lamps of the optical transceivers at both ends are not illuminated. The two-core fiber is not tested by the light source and the optical power meter. We feel very strange about this fault phenomenon. Generally speaking, the red light pen can be tested, and the optical cable is certainly no problem. Now the red light pen can be tested, but the light meter can not be measured. We tested again with a red pen and a light meter, and the phenomenon is still the same.
In order to solve this fault, we borrowed the OTDR (optical time domain tester) test, and the fault point was 2.4 km from the station station. From the user end of the pipe station test, the fault point was 50 meters, so we checked along the cable. It was found that the part of the cable in the dark well was covered with ice. After knocking on the ice block, it was found that the cable was cracked. We speculated that after the water penetrated the cable, it became ice, and the ice cracked the cable core because there was ice, red pen. The emitted 650 nm fluorescence can pass through, and the 1310 nm laser of the light source and the optical power meter is refracted, so that the red light pen can be used for measurement, and the light meter can not be measured.
Change network structure
Because it was winter, it was impossible to splicing the optical cable in the dark well. In order not to delay the user's work, the circuit must be rushed as soon as possible. There are three ways to achieve long-distance Ethernet access from the pipe station to the pipe station production area: fiber, wireless, SDSL Ethernet bridge. Fiber optic interruption can not be used, wireless equipment is expensive and is greatly affected by weather and external interference signals. SDSL Ethernet bridge equipment can use audio cable to provide transmission rate of up to 2Mbps up to 2Mbps, and the cost is low, so the network topology is carried out. Change, using a telephone cable to provide a 2Mbps temporary data link, to address the needs of users.
The link from the pipe station to the drilling information center remains unchanged. One SDSL Ethernet bridge is installed in the pipe station and production area, and the SDSL Ethernet bridge is interconnected by two cables. Due to the long distance, four telephone cables are jumped between the pipe station and the production area. The resistance of the tested single cable is 770 ohms. Two of them are connected to the SDSL bridge. After the bridge is powered up, The external line lights are normal, and then the network bridges are used to connect the bridges at both ends to the switch. Use the computer to ping the gateway of the drilling information center in the production area and ping it. This cable connection temporarily solved the user's Internet problem at the time.
When the weather warmed up, we welded the cracked core in the dark well and the cable link returned to normal. This is an uncommon cable failure.
As a subordinate unit of the drilling company, the drilling pipe station is assigned an IP address by the Drilling Information Center. It is transmitted from the Baijitan ZXR 103904 switch to the Karamay ZXR 10T64G switch through the two-layer transparent link provided by the communication company, and the data is transmitted through the optical cable. Passed to the Keshi Pipeline Station, and then passed the data from the pipe station to the Keshi Pipe Station through the optical transceiver and optical cable.
Cable break
At the beginning of this year, we received a message from the production station of the pipe station that we were unable to access the Internet. We first checked the Layer 2 link provided for the user. A port was configured in the T64G to be divided into the VLAN of the pipe station. The gateway of the ping pipe station can be pinged. Indicates that the link from the T64G to the Drilling Information Center is normal. Next, check the T64G to the pipe station office and check that the fiber transceivers at both ends are all normal.
Finally, we placed the suspect point on the section of the pipe station and the pipe station production area. The length of this single-mode optical cable is 2.4 kilometers. When the RX (light-receiving) light is on, the TX (light-emitting) light is off, the ACT light is occasionally flashing, and the optical fiber transceiver RX (receiving light) in the production area of ​​the pipe station. The lamp is not lit, the TX (lighting) light is on, and the ACT light is not lit, indicating that only the signal confiscation signal is generated in the production area of ​​the pipe station. Therefore, we exchanged the transceiver fibers at both ends. The phenomenon is that the RX lamp of the pipe station is not bright, the TX lamp is on, the RX lamp in the production area of ​​the pipe station is on, and the TX lamp is not lit. Therefore, we judged that a core fiber cable has failed.
The cable goes through the underground pipeline, and the two ends are used for guiding, and the possibility of human damage is not great. Therefore, we have a higher possibility that the optical terminal boxes or pigtails at both ends have a problem, so the pigtails are re-spliced ​​and the terminal boxes at both ends are made. After the test, the red light pen is used for testing, and both cores can receive light, indicating that the terminal box, pigtail fiber, and fiber optic cable are all normal.
After the optical transceiver is connected, the light receiving lamps of the optical transceivers at both ends are not illuminated. The two-core fiber is not tested by the light source and the optical power meter. We feel very strange about this fault phenomenon. Generally speaking, the red light pen can be tested, and the optical cable is certainly no problem. Now the red light pen can be tested, but the light meter can not be measured. We tested again with a red pen and a light meter, and the phenomenon is still the same.
In order to solve this fault, we borrowed the OTDR (optical time domain tester) test, and the fault point was 2.4 km from the station station. From the user end of the pipe station test, the fault point was 50 meters, so we checked along the cable. It was found that the part of the cable in the dark well was covered with ice. After knocking on the ice block, it was found that the cable was cracked. We speculated that after the water penetrated the cable, it became ice, and the ice cracked the cable core because there was ice, red pen. The emitted 650 nm fluorescence can pass through, and the 1310 nm laser of the light source and the optical power meter is refracted, so that the red light pen can be used for measurement, and the light meter can not be measured.
Change network structure
Because it was winter, it was impossible to splicing the optical cable in the dark well. In order not to delay the user's work, the circuit must be rushed as soon as possible. There are three ways to achieve long-distance Ethernet access from the pipe station to the pipe station production area: fiber, wireless, SDSL Ethernet bridge. Fiber optic interruption can not be used, wireless equipment is expensive and is greatly affected by weather and external interference signals. SDSL Ethernet bridge equipment can use audio cable to provide transmission rate of up to 2Mbps up to 2Mbps, and the cost is low, so the network topology is carried out. Change, using a telephone cable to provide a 2Mbps temporary data link, to address the needs of users.
The link from the pipe station to the drilling information center remains unchanged. One SDSL Ethernet bridge is installed in the pipe station and production area, and the SDSL Ethernet bridge is interconnected by two cables. Due to the long distance, four telephone cables are jumped between the pipe station and the production area. The resistance of the tested single cable is 770 ohms. Two of them are connected to the SDSL bridge. After the bridge is powered up, The external line lights are normal, and then the network bridges are used to connect the bridges at both ends to the switch. Use the computer to ping the gateway of the drilling information center in the production area and ping it. This cable connection temporarily solved the user's Internet problem at the time.
When the weather warmed up, we welded the cracked core in the dark well and the cable link returned to normal. This is an uncommon cable failure.
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