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Make OTDR test links easier to judge

The OTDR transmit cable box houses a specified length of fiber optic assembly in a portable hard-shell case, placed between the OTDR and the link under test, to help testers observe near-end connectors and link events.

During OTDR testing, the instrument's transmitted pulses affect the first connector closest to the instrument. By inserting a known length of transmitting fiber, the near-end connector can be distinguished from the OTDR's own transmitted pulses.

According to the test plan, the product can also be used as a receiving optical cable, connected to the end of the link under test, to help observe the insertion loss and reflection performance of the remote connector.

It is not an ordinary fiber optic storage box.

This is a measurement auxiliary component in the OTDR test link. The enclosure is responsible for protecting and organizing the optical fibers, while the fiber length, connectors, and polishing methods serve the specific test plan.

OTDR

Launch Cable
Transmitting optical cable

fiber optic link under test

Receive Cable
Receive optical cable

Test endpoint

Organizing and protecting optical fibers for on-site testing

Used for OTDR transmitter or receiver

It can be configured as a Launch Cable or Receive Cable according to the test link for link loss and connector performance testing.

Fiber optics and connectors are configurable

Supports different fiber optic modes, lengths, input/output connectors, and PC, UPC, and APC polishing methods.

Hard-shell case is suitable for on-site transport.

The yellow hard-shell case, lock, handle, and portable hook facilitate transportation, storage, and on-site testing.

Internal optical fibers are coiled in an orderly manner

The optical fibers are housed along an internal coil structure and held in place by a fixing strap, reducing scattering during transportation and reuse.

Connector individual protection

The input and output connectors are placed separately, and you can see the connector protective sleeves or dust caps in the picture.

Service installation, maintenance and training

It is suitable for fiber optic link testing, installation and acceptance, on-site maintenance, technical training and some calibration testing scenarios.

Different configuration combinations

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160 m · G657A1 single-mode sample

Fiber length	160 m
Fiber type	SM 9/125 μm · G657A1
Input I/P	LC/UPC
Output O/P	SC/UPC

The specific sample from the product photos has labels that allow direct verification of length, fiber type, and end configuration.

Single-mode sample

1000 m · Single-mode sample

Fiber length	1000 m
Fiber type	Singlemode 9/125 μm
Input I/P	SC/APC
Output O/P	SC/UPC

Images are from the original product documentation; the label does not specify the exact fiber type, such as G.652.D or G.657.A.

Capacity is confirmed according to the specific container type: two sets of samples show different lengths and end face combinations. The 2,000 m container capacity, 20,000 m upper limit parameter, and 4 km illustration labels in the document have not yet been established with model correspondences. When ordering, you need to confirm the actual loadable length of the selected container type.

Coiling, fixing, and end-face protection facilitate repeated use.

Maintain a clear fiber optic path inside the box.

The photo shows a yellow hard-shell enclosure, a black lining, a white fiber coil structure, and black securing straps. The optical fiber is coiled along the internal structure, with connectors positioned separately and equipped with end protection.

After testing, retract the cable along the original path to avoid it being caught in the cover or latches, and coil it according to the bending radius requirements of the actual component. The documentation does not specify a minimum bending radius; this should be confirmed based on the selected fiber optic cable structure.

Check the enclosure functions according to the selected enclosure type.

The document mentions a latch with a locking function, and an automatic pressure balancing valve to balance the pressure difference inside and outside the chamber when altitude and temperature change. Whether a specific chamber model includes this valve needs to be checked separately.

The documentation describes waterproof and dustproof properties but does not list the IP rating or test results; when there are specific on-site protection requirements, the corresponding rating and applicable conditions should be confirmed.

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Details of the fiber coil structure, retaining strap,

and connector end protection.

The parameters should be viewed together with the configuration and test conditions.

Enclosure and Environmental Parameters

For narrow screens, horizontal scrolling is possible to view complete parameters. The environment range is as stated in the original documentation; test conditions are not provided.
parameter	Data annotation	Confirmation points during selection
Small box size	238 × 141 × 67 mm	The original dimensions are 23.8 × 14.1 × 6.7 cm.
Large box size	304 × 248 × 120 mm	The original text is 30.4 × 24.8 × 12 cm; confirm the correspondence with the length configuration.
Material	SR Polypropylene	Polypropylene; the original text does not define the specific meaning of "SR".
Color and box form	Yellow, sturdy hard-shell shipping box	The specific configuration of buckles, handles, and pressure balance valves should be checked according to the box type.
empty box weight	Original text: 0.75kg/3.5kg without fiber	The suspected weights are 0.75 kg and 3.5 kg, but the corresponding box types are not clearly defined.
Operating temperature	-40 to +85 °C	Confirm the actual applicable scope of the selected fiber optic components and enclosure.
Storage temperature	-40 to +85 °C	Original source statement.
relative humidity	0–95%, no condensation	Condensation must not occur.

Fiber Optic and Connector Parameters

Typical losses correspond only to the wavelengths and lengths listed in the original data; all specifications should correspond to the final components and test methods.
parameter	Data annotation	Conditions and meanings
Fiber type	SMF G652A Corning, G652D, G657A; OM1, OM2, OM3, OM4	Specify the exact fiber optic type and brand requirements in the order.
Fiber length	100–20,000 m	Each model must be checked against the description of the enclosure as "maximum 2,000 m" and the 4 km image example.
Lead wire	2 m; 3 mm buffer	Whether 2 m or 3 mm refers to the outer diameter or other structural features is not clearly stated in the original text.
connector	SC / LC / FC / ST	The input and output ends are specified separately.
end face grinding	PC / UPC / APC	Matches the endface type of the corresponding interface.
Typical losses	<0.5 dB @ 1310 nm, 1000 m	It is not specified whether connectors at both ends are included; other wavelengths, lengths and fiber types should be confirmed separately.
Return loss	PC ≥35 dB; UPC ≥50 dB; APC ≥60 dB	Confirm the relevant specifications based on the selected connector end face type.
Repeatability	≤0.2 dB (original text specifies 1000 times)	The specific testing methods and conditions for repeated connections need to be confirmed.
Interchangeability	≤0.2 dB	This is used to describe the performance changes during interoperability connections; the original text does not provide a testing method.

Common problems encountered during product selection

Can transmitting optical fiber eliminate the dead zone of the OTDR itself?

The transmitting optical cable provides a pre-fiber section so that the starting point of the measured link is located after the recovery zone of the initial strong reflection, when the length is appropriate. The instrument's own dead zone characteristics are still related to the pulse width and measurement conditions; the length should be selected according to the actual settings.

Is it necessary to use both transmitting and receiving optical cables simultaneously?

When the test plan requires evaluation of near-end and far-end connectors, auxiliary optical fibers can be configured before and after the link, respectively. The receiving optical cable provides analyzable curves after the far-end connector; the specific configuration is determined according to the test objectives.

Which should I choose, 160 m or 1000 m?

Both are sample lengths shown in existing photos. When selecting, you should provide the OTDR model, pulse width or dead zone information, the type of fiber under test, and the test target to confirm the required recovery distance and then match it with the available cabinet type.

What is the maximum range a fiber optic box can accommodate: 2 km, 4 km, or 20 km?

The original documentation included enclosure descriptions stating "maximum capacity 2,000 m", parameter ranges of "100–20,000 m", and enclosure photos labeled 4 km. Model correspondences for this information have not yet been established; the maximum length needs to be confirmed based on the actual enclosure type, fiber optic structure, and configuration.

Why do we still need to confirm the test conditions even if the typical loss is less than 0.5 dB?

The original text only provides typical values at 1000 nm and 1310 nm, without specifying whether it includes connectors at both ends, the measurement method used, or values for other wavelengths and lengths. Loss parameters, configuration, and test conditions should be agreed upon together during acceptance testing.

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