Question 1

What's SC/UPC connector and patchcord?

Accepted Answer

SC is a fiber optic connector adopting a push-pull insertion and removal structure; UPC refers to the end-face polishing method of the connector. When purchasing, specifications such as fiber type, the interface at the other end, single-core or dual-core, length and jacket also need to be confirmed.

Question 2

Can SC/UPC and SC/APC be directly connected?

Accepted Answer

Direct interconnection is not recommended. UPC and APC have different end-face angles. Mixed connections will affect contact and reflection performance and may damage the end faces.
If two devices adopt UPC and APC ports respectively, a hybrid patch cord with UPC on one end and APC on the other can be selected to match the end-face type at each connection point. A common adapter alone cannot properly match UPC and APC.

Question 3

Should single-mode or multi-mode be selected?

Accepted Answer

It shall be compatible with optical modules and existing fiber links. OS2 single-mode patch cords are generally selected for single-mode links; for multi-mode links, corresponding grades such as OM2, OM3 and OM4 shall be chosen in accordance with design requirements.

Question 4

Do SC/UPC patch cords support Gigabit and 10 Gigabit speeds? What transmission distance can they achieve?

Accepted Answer

The rate and distance cannot be judged solely based on SC/UPC connectors. The actual performance is jointly determined by the optical module, fiber type, operating wavelength, total link length and loss.
When selecting components, you shall provide the target rate, optical module model and total link length, and then verify the applicability. The patch cord length is not equivalent to the transmission distance supported by the equipment.

Question 5

What do insertion loss and return loss mean respectively?

Accepted Answer

Insertion loss indicates how much optical power is lost after connection; generally, a lower value is better. Return loss represents the degree of suppression of reflected light. When expressed as a positive dB value, a higher value is usually preferable.
When comparing products, confirm whether the specifications correspond to a single connector or the entire patch cord, and distinguish between typical values and guaranteed maximum/minimum values. Data obtained under different test conditions c

Question 6

What kind of loss indicators can be required during procurement?

Accepted Answer

The insertion loss of SC/UPC connectors shall be less than 0.2dB, and the return loss shall be greater than 45dB.
The insertion loss of SC/APC connectors shall be less than 0.3dB, and the return loss shall be greater than 60dB.
Our products are delivered from the factory in strict accordance with the above standards.

Question 7

How to choose between G.652D, G.657A1 and G.657A2?

Accepted Answer

These are optical fiber specifications and cannot be simply regarded as different quality grades. The G.657 series features improved bend loss performance, suitable for wiring environments where bend loss needs to be controlled; G.657A2 is generally applied under stricter bending conditions than G.657A1.
For space-constrained scenarios such as cabinets and weak current boxes, priority can be given to checking the G.657A1 or G.657A2 solutions, while the bending requirements of finished patch cord

Question 8

Can patch cords be bent to a very small radius? Will bend-insensitive fiber never break?

Accepted Answer

Bend-insensitive fiber mainly reduces optical loss caused by bending. It does not mean the fiber can be folded, tightly knotted, or withstand arbitrary tension.
During installation, the minimum bending radius specified for finished patch cords shall be followed. Avoid sharp bends at the connector tail, overtightening with cable ties, and compression by cabinet doors. Requirements vary among different products. The bending parameters of bare fiber cannot be directly used as installation parameter

Question 9

What are the differences between the outer diameters of 2.0 mm and 3.0 mm?

Accepted Answer

A smaller outer diameter helps save wiring space; a larger outer diameter is generally easier to grip and manage. However, tensile and compressive performance also depend on reinforcing materials, sheaths and the overall structure, so quality cannot be judged solely by thickness.
Selection should be based on cabinet density, routing paths, fixing methods and actual mechanical performance requirements.

Question 10

Can ordinary patch cords be used outdoors?

Accepted Answer

It is necessary to check whether the product is clearly suitable for outdoor environments. Ordinary indoor jumpers are not supposed to have long-term ultraviolet resistance, waterproof performance or the ability to adapt to outdoor temperature changes by default.
For outdoor applications, the laying method, whether conduit installation is adopted, exposure to rain and sunlight, and temperature range shall be specified before selecting the corresponding sheath, structure and connection protection

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