SC Equip to ST Multimode OM1 62.5/125 Mode Conditioning Fiber Optic
Patch Cable
Description
Unique-Tel 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.
Function
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)
Features and Application
With following 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.
Increased transmission bandwidth up to 4 times
Fits existing cabling scheme Easy installation,Removes effects form
DMD
Permanent, low-profile offset closure
PC, UPC, APC polish types
Low insertion loss
Reduced modal noise
OFNR rated jacket complies with strict building codes
Compliant with IEEE 802.3 applications
Installation
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)
1. 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.
2. 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.
3. 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.
4. 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.
Specifications
(Notes:A B C and D,corresponding to A B C and D on Fig.2).
| Transmission Direction | Testing Wavelength | Insertion Loss |
| DuB | 850nm-1300nm | Max 0.30dB |
| BuD | 850nm-1300nm | Max 0.30dB |
| CuA | 850nm-1300nm | 15.0dB(50/125um) 18.0dB(62.5/125um) |
| AuC | 850nm-1300nm | Max 0.30dB |
| CuA | 1310nm-1550nm | 2.10dB(50/125um) 2.60dB(62.5/125um) |
| Return Loss | APC 60.0dB UPC 50.0dB | 35.0dB |
| Durability | 1000 mating | typical0.20dB |
| Operating Temperature | -40 to 85C | -40 to 185F |
Note
Mode 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 cords are required for link
distances greater than 984 feet (300 meters).
