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LAN-RING - minimum quality requirements for optical routes

Below is an overview of the minimum quality requirements for LAN-RING optical routes:

  • All requirements are universally applicable to all types of manufactured F and G series switches and all media converters with METP SFP modules of the BX-100, BX-1000 and BX-10G series,
  • If the original SFP modules are not used on the F and G series switches or media converters but are used the SFP modules from other manufacturers, only the requirements for reflection damping (OTDR) apply.
Basic parameters of SFP modules METEL
Type Bitrate Finishing and Grinding Wavelengths
Tx/Rx [nm]
Fibers Reach for SM/MM Fiber [km]
Power/Sensitivity [dBm]
BX-100-20-W4-L 100Mbps SC/PC 1310/1550 1 20/5 -14 ~ -8 / < -32
BX-100-20-W5-L 100Mbps SC/PC 1550/1310 1 20/5 -14 ~ -8 / < -32
BX-1000-20-W4-L 1Gbps SC/PC 1310/1550 1 20/2 -9 ~ -3 / < -22
BX-1000-20-W5-L 1Gbps SC/PC 1550/1310 1 20/2 -9 ~ -3 / < -22
BX-1000-60-W4-L 1Gbps SC/PC 1310/1550 1 60/- -3 ~ +2 / < -22
BX-1000-60-W5-L 1Gbps SC/PC 1550/1310 1 60/- -3 ~ +2 / < -22
BX-10G-20-W4 10Gbps LC 1270/1330 1 20/- -2 ~ +2 / < -14 
BX-10G-20-W5 10Gbps LC 1270/1330 1 20/- -2 ~ +2 / < -14

Failure to comply with these requirements may result in a significant reduction in the quality of the connection or even in the connection. Poor quality optical path is typically manifested by:

  • TCP Video Streaming - for TCP communication, the TCP client first establishes a connection with the server that acknowledges the receipt of the data. As the number of errors increases, the load on the network increases, which can lead to network congestion.
  • UDP Video Streaming - unlike TCP communication, the counterparties do not establish a connection and the data receipt is not confirmed. For example, in multicast clients, packet corruption or loss results in randomly occurring lines in the image.

Supported Fiber Types

All BX100 and BX1000 series SFP modules are universally applicable to all types of fiber optics listed below.

Type Core / Sheath Diameter Type
BX-100 Series
BX-1000 Series
BX-10G Series
Multimode 50/125 µm OM2-4* Compatible Compatible -
62.5/125 µm OM1* Compatible Compatible -
Singlemode 9/125 µm OS2 Compatible Compatible Compatible
* Especially for types OM1 and OM2, consider the bandwidth that is limiting for transmission over long distances. See the paragraph "Optical Fiber Bandwidth"

Optical Fiber Bandwidth

Bandwidth given in MHz / 1km limits usability especially in older types of multimode fibers OM1 and OM2.
The table below shows the maximum reach for different data rates and fiber types.

OM1 - 62.5/125µm Multi-Mode OM2 - 50/125µm Multi-Mode OM3 - 50/125µm Multi-Mode OM4 - 50/125µm Multi-Mode OS2 - Single Mode
100Mbps 2000m 2000m 5000m 5000m 20km
1Gbps 550m 550m 1000m 2000m 20/60km
10Gbps 300m 300m 300m 300m 20km



OTDR - Attenuation of Reflections on Joints and Welds

Before installing active elements we recommend measuring all optical paths by the OTDR method. Measurements shall be made from both sides and with a ballast eliminating the OTDR analyzer dead zone. Measurement using this method gives you information about:

  • Total optical path attenuation,
  • attenuation of all welds, couplings and other connections
  • accurate positioning of all welds, couplings and possible disturbances in the routes
  • attenuation of optical fibers and its distribution in the path
  • route length
  • fiber inhomogeneity,
  • continuity of routes to verify correct assembly

NOTE: Low damped reflections have a major effect on the function of the installed active elements. In case of complaints due to connection failures, communication jamming, high error rate and similar reasons, we reserve the right to deal with the complaint only after submission of OTDR protocols to the used optical routes. The aim of this measure is to speed up the resolution of the complaint, because in the vast majority of cases with the above-mentioned causes are reflections in optical paths.

Minimum Reflection Attenuation
Multimode Fibers 40dB
Singlemode Fibers 60dB

Updated: 24. 04. 2020