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Mode Conditioning Cable


Mode Conditioning Patch cord (MCP), also known as Gigabit Launch Patch cord, is used in longwave/ long haul (LX/LH) Gigabit Interface Converter (GBICs) with multimode fiber. Without using MCP, multiple signals are generated when a singlemode laser launch into the center of a multimode fiber. This would result in pulse broadening or Differential Model Delay (DMD) effects which degrade the modal bandwidth of fiber cable and limit the link span (the distance between the transmitter and receiver) for operating Gigabit Application. MCP provides an offset single mode to multimode fiber connector point that eliminates the effect of DMD by launching the single mode laser into multimode core at a specified offset.

OMC manufactures and supplies standard and custom length 50/125,62.5/125 and OEM equivalent mode conditioning fiber optic patch cords for 1000BASE-LX/LH Gigabit Ethernet (1300nm long wavelength) applications installed into existing multimode cable plants. These specialized cords help avoid Differential Mode Delay(DMD)effects that can occur when long wave transceiver modules operate at both single-mode and multimode wavelengths. And they are available with FC, ST, SC, LC and MT-RJ connectors.


How the Mode Conditioning Cable Works
The need for this conditioning fiber optic patch cord is due to the single-mode launch nature of the-LX or long-wave(1300nm) transceiver modules used for Gigabit Ethernet. Launching a single-mode laser into the center of a multimode fiber can cause multiple signals to be generated that confuse the receiver at the other end of the fiber. In that case, a mode conditioning patch cord eliminates these multiple signals by allowing the single-mode launch to be offset away from the center of a multimode fiber. This offset point creates a launch that is similar to typical multimode LED launches. (see diagram below) 

Mode Conditioning Cable

In some cases, customers might experience that a link would be operating properly over FDDI-grade,OM1 or OM2 fiber types without MCP.However please note there is no guarantee link will be operating properly over time, and the recommendation remains to use the MCP.There is a risk associated to this type of nonstandard deployment without MCP,especially when the jumper cable is an FDDI-grade or OM1 type.In such case the power coupled directly into a 62.5-micron fiber could be as high as a few dBm and the adjacent receiver will be saturated.This can cause high bit error rate,link flaps,link down status and eventually irreversible damaged to the device.Mode conditioning patch cords can only convert single-mode to multimode.If you want to convert multimode to single-mode,then a media converter will be required.Another alternative for short reaches within the same location is to use a single-mode patch cable.There will be no saturation over single-mode fiber.


How to Install the Mode Conditioning Cable

If your gigabit LX switch is equipped with SC or LC connectors,please be sure to connect the yellow leg(Singlemode)of the cable to the transmit side,and the orange leg(multimode)to the receive side of the equipment.It is imperative that this configuration be maintained on both ends.The swap of transmit and receive can only be done at the cable plant side.(see diagram below)

Mode Conditioning Cable

Things to Know When Using Mode Conditioning CablesMode conditioning patch cords are usually used in pairs.Which means that you will need a mode conditioning patch cord at each end to connect the equipment to the cable plant.Generally,Mode Conditioning patch ords are required for link distances greater than 984 feet(300 meters).

Mode Conditioning Cable


Features and Application of Fiberstore's MCP(Mode Conditioning Patch Cable)


·Increased transmission bandwidth up to 4 times

·PC,UPC,APC polish types

·Fits existing cabling scheme

·Low insertion loss

·Easy installation

·Reduced modal noise

·Removes effects form DMD

·OFNR rated jacket complies with strict building codes

·Permanent, low-profile offset closure

·Compliant with IEEE 802.3 applications

With above excellent characteristics, mode conditioning patch cables can be used to deploy new high-speed 1000BASE-LX routers, switches, or transceivers within existing multimode system backbones. These cables can be applied in Local Area Networks and Metropolitan Area Systems.

Specifications of Mode Conditioning Patch Cable



Insertion Loss

Light Source Transmission Direction

Testing Wavelength

Insertion Loss


850nm, 1,300nm

Max .≤ 0.30dB


850nm, 1,300nm

Max .≤ 0.30dB


850nm, 1,300nm

≤ 15.0dB(50/125um);
≤ 18.0dB(62.5/125um)


850nm, 1,300nm

Max .≤ 0.30dB


1,310nm, 1,550nm

≤ 2.10dB(50/125um);
≤ 2.60dB(62.5/125um)

Return Loss

SM APC≥60.0dB; SM UPC≥50.0dB

MM PC≥35.0dB


1,000 mating, typical≤0.20dB

Operating Temp

-20℃ to +70℃

Storage Temp

-40℃ to +85℃

Notes: A B C and Corresponding to A B C and D on Fig.2.

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