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Mode conditioning patch cables for Gigabit Ethernet applications are required when Gigabit 1000 Base-LX routers and switches are installed into existing multimode cable plants, which will increase your bandwidth without having to run a whole new fiber optic network.
The need for this patch cord is due to the single-mode launch nature of the -LX or long-wave (1300 nm) transceiver modules used for Gigabit Ethernet. These modules have to operate for both single-mode and multimode fibers. 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. These multiple signals, caused by Differential Mode Delay (DMD) effects, severely limit the cable distance lengths for operating at Gigabit Ethernet. 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.
The launch of the light coming out of the equipment begins on a Singlemode fiber. The Singlemode fiber is precision fusion spliced to the multimode fiber to a precise core alignment. The light is launched onto the multimode fiber at a precise angle, giving the cable its mode conditioning properties. The fusion splice is protected by a black over-wrap, and on the right side there is an orange and a yellow cable. This is the side of the cable that connects to the gigabit equipment with the yellow Singlemode leg connecting to the transmit side.
- Environmentally sealed construction
- Insertion Loss: <0.5
- Back reflection (Singlemode end)>50dB
- Optical offset to IEEE 802.5
- "Masks" Differential Mode Delay (DMD) effects
- Made in the USA
Things to know when using mode conditioning cables to patch an existing multimode cable plant to your Gigabit LX equipment.
- Mode conditioning cable are normally used in pairs. That means that you will need a MC cable at each end to connect the equipment to the cable plant. So then these cables are usually ordered in even numbers. The usual reason why someone may order one cable is so they may keep it as a spare.
- 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)
- Please see Frequently asked questions below for additional important information.
Principals and Basics on how a Mode Conditioning Cable works
The launch of the light coming out of the equipment begins on a Singlemode fiber. The Singlemode fiber is precision fusion spliced to the multimode fiber to a precise core alignment (see fig. 1). The light is launched on to the multimode fiber at a precise angle, giving the cable its mode conditioning properties. Looking at the mode conditioning cable assembly in figure 2, we can see that the fusion splice this protected by a black over-wrap. notice that on the right side there is an orange and a yellow cable. This is the side of the cable that connects to the gigabit equipment with the yellow Singlemode leg connecting to the transmit side.
Frequently Asked Questions
All of our mode conditioning cables are custom made to order . By industry standards, our lead times are very short . The lead time will vary according to the quantity desired , and the production load at the time of the order. Average lead times are as follows:
1 - 2 days for orders of 1 to 12 cables,
3 - 5 days for orders of 12 to 40 cables,
1 week for orders of 40 to 100+ cables.
Note: MT-RJ and MU cables may have higher lead times.
The great demand for increased bandwidth has prompted the release of the 802.3z standard (IEEE) for Gigabit Ethernet over optical fiber. 1000Base-LX requires the use of a launch conditioning patch cord to allow for proper propagation of the laser VCSEL light along the multimode fiber.
The Mode Conditioning Patch Cord is designed for long wave (-LX) multimode applications of Gigabit Ethernet. It is compliant with this IEEE 802.3z application standard. The need for this patch cord is due to the single-mode launch nature of the -LX or long-wave (1300 nm) transceiver modules used for Gigabit Ethernet. These modules have to operate for both single-mode and multimode fibers. 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. These multiple signals, caused by Differential Mode Delay (DMD) effects, severely limit the cable distance lengths for operating Gigabit Ethernet. 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.
Features
- IEEE-802.3z (Gigabit Ethernet) Compliant
- Permanent offset closure
- Low profile offset closure
- Low loss
- Fits existing cabling scheme
- Easy to use
Benefits
- "Masks" Differential Mode Delay (DMD) effects
- Correct offset always maintained
- Aesthetically pleasing
- Uses precision ceramic ferrules
- Use in place of standard equipment-to-cable plant patch cord
- Functions the same as a standard patch cord
Specifications
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