Problems encountered in the installation and use of fiber optic transceivers and their solutions

This article will share with you the problems and solutions frequently encountered during the installation and use of fiber optic transceivers. When encountering these problems, how should we deal with them? Now Fiber-mart.com Communication will share with you the installation and troubleshooting methods of the optical fiber transceiver through this article:

Problems encountered in the installation and use of optical fiber transceivers

Step 1: First check whether the indicator light of the fiber optic transceiver or optical module and the twisted pair port indicator light are on?

1. If the optical port (FX) indicator of the A transceiver is on and the optical port (FX) indicator of the B transceiver is off, the fault is at the A transceiver: one possibility is: A transceiver (TX) optical transmission The port is broken, because the optical port (RX) of the B transceiver cannot receive optical signals; another possibility is: there is a problem with the optical fiber link of the optical transmitting port of the A transceiver (TX), such as a broken fiber jumper .

2. If the FX indicator of the transceiver is off, please make sure whether the optical fiber link is cross-linked? One end of the fiber jumper is connected in parallel; the other end is connected in cross mode.

3. Twisted pair (TP) indicator light is not on. Please make sure whether the twisted pair connection is wrong or wrong? Please use a continuity tester to check (but the twisted pair indicator of some transceivers must wait for the optical fiber link Lights up after the circuit is connected).

4. Some transceivers have two RJ45 ports: (ToHUB) indicates that the cable connecting the switch is a straight-through line; (ToNode) indicates that the cable connecting the switch is a crossover cable.

5. There is an MPR switch on the side of some transmitters: it means that the connection line to the switch is a straight-through line; DTE switch: the connection line to the switch is a crossover line.

Step 2: Analyze and determine whether there are problems with fiber jumpers and cables?

1. On-off detection of optical fiber connection: use a laser flashlight, sunlight, etc. to illuminate one end of the optical fiber jumper; see if there is visible light at the other end? If there is visible light, it indicates that the optical fiber jumper is not broken.

2. Optical cable on-off detection: use a laser flashlight, sunlight, or luminous body to illuminate one end of the optical cable connector or coupler; see if there is visible light at the other end? If there is visible light, it means that the optical cable is not broken.

Step 3: Is the half/full duplex mode wrong?

There is an FDX switch on the side of some transceivers: it means full-duplex; HDX switch: it means half-duplex.

Step 4: Use an optical power meter to detect

The luminous power of the optical fiber transceiver or optical module under normal conditions: multimode: between -10db and 18db; single mode 20 km: between -8db and 15db; single mode 60 km: between -5db and 12db ; If the luminous power of the optical fiber transceiver is between -30db–45db, then it can be judged that there is a problem with the transceiver.

Matters needing attention in fiber optic transceivers

For the sake of simplicity, it is better to use a question-and-answer format, which can be clear at a glance.

1. Does the optical transceiver itself support full duplex and half duplex?

Some chips on the market can only use the full-duplex environment at present, and cannot support half-duplex. If they are connected to other brands of switches (SWITCH) or hubs (HUB), and it uses half-duplex mode, it will definitely cause Serious conflicts and packet loss.

2. Have you tested the connection with other fiber optic transceivers?

At present, there are more and more optical fiber transceivers on the market. If the compatibility of transceivers of different brands has not been tested beforehand, it will also cause packet loss, long transmission time, and sudden speed and slowness.

3. Is there any safety device to prevent packet loss?

In order to reduce costs, some manufacturers use Register data transmission mode when manufacturing fiber optic transceivers. The biggest disadvantage of this method is instability and packet loss during transmission. The best is to use buffer circuit design, which can be safe. Avoid data loss.

4. Temperature adaptability?

The fiber optic transceiver itself will generate high heat when it is used. When the temperature is too high (not greater than 50°C), whether the fiber optic transceiver is working properly is a factor worthy of customers’ consideration!

5. Does it comply with the IEEE802.3u standard?

If the fiber optic transceiver meets the IEEE802.3 standard, that is, the delaytime is controlled at 46bit, if it exceeds 46bit, it means that the transmission distance of the fiber optic transceiver will be shortened!!!

6. After-sales service:

In order to enable the after-sales service to respond promptly and early, it is recommended that customers purchase optical fiber transceivers according to the manufacturer’s strong strength, technology, reputation and other companies. For example: ETULINK (etulink.com) is a high-tech company focusing on the development, application and promotion of new technologies and new products. With a good reputation, stable product quality and professional technical service capabilities, the company has become the preferred supplier of switching equipment, routing equipment and other network products at home and abroad.

Author: Fiber-MART.COM

eShop of Fiber Optic Network, Fiber Cables & Tools

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