What is an MDF, OMDF?

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Melontel, one of the leading Chinese communication equipment manufacturers, is here today. This article will cover definitions, applications, specifications, and benefits, among other things. Continue reading to learn more.

In the past, because ODF is mainly oriented to equipment connection, so the structure is basically based on single-sided rack, and the capacity is also small. With the rapid implementation of FTTX, optical fiber is used in large numbers in the access layer and gradually replace copper cables, which put forward higher requirements on the capacity, function and structure of ODF, making the original ODF highlights the shortcomings of small capacity, single function, walking fiber channel and pigtail shelter capacity is seriously insufficient, cable management is very inconvenient. Therefore, the market demand for MDF and OMDF is increasing. This article will provide you with a detailed introduction to MDF and OMDF.

There should be a fiber optic cable introduction, fixing and protection device. The device has the following functions.

(1) the fiber optic cable is introduced and fixed in the rack to protect the fiber optic cable and the fiber core after opening and stripping from damage; and meet the requirements of the fiber core radius of curvature of fiber optic cable.
2) Insulation of the metal part of the fiber optic cable and the rack.
(3) fixed cable metal sheath and strengthen the core should be reliably connected to high-voltage protective grounding device.
(4) bare fiber protection hose should be extrusion-resistant, aging-resistant, in line with the corresponding specification requirements.
(5) to ensure that the later deployment of fiber optic cable fixed shall not affect the safety of the pre-placement of fiber optic cable.
(6) fiber optic cable introduction, fixing and protection devices should be able to firmly and reliably fix the fiber optic cable, there shall be no loose, free twisting phenomenon.

Should have fiber optic into the end device. The device should facilitate the operation, construction, installation and maintenance of fiber optic cable, fiber cores and pigtail splicing; can fix and protect the joint parts straight and not displaced, to avoid the impact of external forces, to ensure that the coiled fiber cores are not damaged.

Through the fiber optic connector plug, it can quickly and easily dispatch the fiber cores in the cable and change the routing of the optical transmission system.

Fiber cores are protected and fixed after the cable is stripped and introduced into the fiber into the end device.

The rack and unit should have a complete marking and recording device for easy identification of the fiber core serial number or transmission path sequence, and the recording device should be easy to modify and replace.

Rack door should be posted with a clear color fiber schematic; rack should be set up with a marker box, the box can be placed in the blank marker card, easy for maintenance personnel to record information.

The rack and unit should have enough space for storing the remaining fiber. Its structure should be easy to maintain the adjustment of patch fiber in the cut, and easy to remove the abandoned patch fiber.

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(1) the rack high-voltage protective grounding device is connected to the metal reinforcement core and metal sheath in the fiber optic cable, the cross-sectional area of the connecting wire should be greater than 6mm2.

(2) the rack high-voltage protective grounding device and the ground connected to the connection terminal cross-sectional area should be greater than 3mm2.

(3) The insulation between the rack high-voltage protective grounding device and the rack, the insulation resistance is not less than l000MΩ/500V (DC).

(4) Rack high-voltage protective grounding device and the rack between the voltage resistance of not less than 3000V (DC) / 1min without breakdown, no flying arc.

(5) The rack high-voltage protective grounding device should be able to ground reliably, and there should be an obvious grounding mark at the ground.
(6) rack grounding device, the entire rack should ensure electrical conduction, and a perfect grounding system, rack top frame and bottom frame should have M8 grounding copper nuts for rack grounding; grounding should be obvious grounding mark at the location

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(1) MDF as far as possible to consider placing in the measurement table, so as to facilitate the future management of the jump connection.
(2) in principle, the trunk, relay cable “straight”, equipment and contact fiber optic cable “horizontal”.
(3) generally adopt 2.6 meters height, horizontal column of 48 cores an ODM, a total of 7 boxes; straight column of 72 cores an ODM, a total of 11 boxes.
(4) in the first MDF horizontal column side of the middle of the empty 3 blocks (03, 04, 05) for 144-core adapter cable (contact cable) on the column, with this adapter cable (contact cable), MDF in place will give priority to the new fiber optic cable on the column, the original cable cut on the column will be determined depending on the actual situation.
(5) the principle of jumping fiber using 2.0 wire diameter, in the middle of the front and rear columns added line buckle, convenient pigtail jumping finishing.
(6) adapter unified use of SC, to facilitate the jumping of large capacity.
(7) the construction process and the indicators refer to the original fiber optic cable construction process, equipment construction process requirements of the server room.

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(1) the bureau before the well and channel pipe hole must be set within the sub-pipe.
(2) the pipe hole from the bottom layer, the same layer, from the farthest away from the alignment frame, see the attached Figure 1, the number of small first use:.

(3) optical cable residual line retained about 10 meters, left in the channel, alignment and retention location (from the location near the front of the bureau well, vertical ground placement, no overlap.

At the same time, the remaining line shall not be left in the side near the alignment frame) see Figure 2: top view.

(4) ODM and lead plate 1.4.1 under the alignment inline lead plate and ODM position as shown in Figure.

① The installation position of the lead plate and ODM to maintain the level.

② The first lead plate is installed in the position parallel to the 05 ODM (the upper edge is parallel to the upper and lower edge of the 05 ODM).

③ The No.2 lead plate is installed parallel to the No.09 ODM (the upper edge is parallel to the upper and lower edges of the No.09 ODM).

④ The No. 3 lead plate is installed parallel to the label plate (the upper edge is parallel to the upper edge of the label plate).

⑤ The No.1 lead plate is installed in the deepest position, and the No.2 and No.3 are installed in the 5th, 4th and 3rd holes from outside to inside respectively.

(6) The fiber optic cable at the end of the lead plate on the previous layer can only be passed through the back of the lead plate on the next layer.

(7) The fiber optic cable terminated in ODM No. 01 to 04 is fixed on the No. 1 lead plate; the fiber optic cable terminated in ODM No. 05 to 08 is fixed on the No. 2 lead plate; the fiber optic cable terminated in ODM No. 09 to 11 is fixed on the No. 3 lead plate.

⑧ When the fiber optic cable is terminated, in the case of saturation of the upper lead plate, the lower lead plate can be used, and vice versa is not allowed.

⑨ After the optical cable is peeled and fixed, the protective hose is placed upward against the ribbed column between the lead plate and ODM, and then into the tray, during which, no loops or downward bending is allowed.

As shown in Figure 3, in the case of downward alignment.
(1) The lead plate is installed at a position level with the ODM.
(2) No. 1 lead plate is installed in the position parallel to the label plate (the lower edge is parallel to the upper edge of the label plate).

(3) No. 2 lead plate is installed in the position parallel to the 04 ODM (the lower edge is parallel to the upper and lower edge of the 09 ODM).

(4) No. 3 lead plate is installed in the position parallel to No. 08 ODM (the lower edge is parallel to the upper and lower edge of No. 04 ODM).

(5) No. 1 lead plate is installed in the shallowest position, No. 2 and No. 3 are installed in the deepest position, respectively, in the 3rd, 4th and 5th holes from the outside in.

(6) in the next layer of cable board into the end of the fiber optic cable, only in the previous layer of cable board back through.

(7) In the 01 to 04 ODM into the end of the cable, in the No. 1 cable plate fixed; in the 05 to 08 ODM into the end of the cable, in the No. 2 cable plate fixed; in the 09 to 11 ODM into the end of the cable, in the No. 3 cable plate fixed.

(8) fiber optic cable into the end, in the case of saturation of the lower lead plate, you can use the upper lead plate, and vice versa is not allowed.

1）After the optical cable is stripped and fixed, the protective hose is placed downward against the ribbed column between the lead plate and ODM, and then into the tray, during which, no loops or upward bending is allowed.

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(1) in-rack jumping fiber: jumping fiber from the equipment side of the fiber terminal unit terminal to start deployment, after the corresponding fiber buckle into the fiber tray to the right, through the corresponding equipment side into the end of the corresponding fiber ring, side hanging fiber axis to adjust the height into the line side, through the target terminal is located on the line side into the end of the corresponding fiber ring frame, through the tray left independent hanging fiber ear to the line side 12-core integrated tray front adapter into the end.

(2）inter-rack jumping fiber: jumping fiber from the equipment side of the fiber terminal unit terminal to start deployment, after the corresponding fiber buckle into the fiber tray to the right after deployment, through the horizontal fiber channel to the target outer terminal is located in the MODF column frame, through the corresponding fiber ring, side hanging fiber axis to adjust the height into the line side, through the target terminal is located in the line side into the end frame corresponding to the fiber ring, through the tray left independent hanging fiber lug to the line side 12 The front end of the integrated tray adapter into the end of the core.
(2) The specific patch fiber placement route should be determined according to the MODF model of each manufacturer.

(1) the use of 2.0mm diameter yellow tight tube (lined with Kevlar) patch fiber.

(2) patch fiber connector model is consistent with the adapter (generally SC).

(3) the model of the patch fiber is consistent with the patch cable (generally G.652).

(4) Use double-core patch fiber when patching double-core optical paths and single-core patch fiber when patching single-core optical paths.

(5) according to the actual situation to choose the appropriate length of patch fiber. Jumping fiber length series to 0.5m.

(1) jumping fiber requirements through the jumper ring alignment.
(2) the alignment should follow the principle of proximity and neatness.
(3) the alignment must be set up along the wiring frame routing, shall not cross into the cable, fiber optic cable into the end of the fiber area, shall not block the terminal panel and label.
(4) jumping fiber between the straight column must first cross to the horizontal side of the alignment slot, and then along the alignment slot back through the straight column.
(5) jumping fiber in the alignment slot on the loose and tight, the residual line is only allowed to be reserved in the space between the lower line of the alignment slot, jumping fiber residual line with gravity is a natural U-shaped curve, the residual line shall not be crossed.
(6) the remaining line shall not be placed in any position in the circle.

(1) jumping fiber shall not have the outer skin broken, playing the phenomenon of small circles.

(2) jumping fiber is strictly prohibited in the middle joint.

(3) jumping fiber should be in accordance with the norms of alignment, not arbitrary horizontal jumping, oblique jumping.
(4) the terminal is not connected to the jumping fiber, must wear a dust cap.
(5) jumping fiber alignment shall not interfere with the construction and maintenance of optical cable.

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1, the metal part of the cable and rack insulation;
2, bare fiber protection hose extrusion resistance, aging resistance;
3, the later deployment of optical cable fixed does not affect the safety of the pre-launched cable;
4, the fixed cable metal sheath and reinforced core can be connected to high-voltage protective grounding device;
5, the introduction of optical cable and fixed in the rack to protect the cable and the fiber core after stripping will not be damaged;
6, optical cable Introduction, fixing and protection devices can firmly and reliably fix the fiber optic cable, there will be no loose, free twisting phenomenon.

The fiber transfer function through the fiber optic connector plug, can quickly and easily dispatch the fiber cores in the cable and change the routing of the optical transmission system.
Fiber-optic termination function with fiber-optic termination device, in order to facilitate the operation, construction, installation and maintenance of fiber optic cable, fiber cores and pigtail splicing, can fix and protect the connector parts straight and not displaced, to avoid the impact of external forces, to ensure that the coiled fiber cores are not damaged.
The fiber storage function rack and unit should have enough space for the storage of residual fiber. Its structure should be easy to maintain the adjustment of the patch fiber in the cut, and easy to remove the abandoned patch fiber.
The logo and record function racks and units with perfect identification and recording devices, can easily identify the core serial number or transmission road sequence, and recording devices should be easy to modify and replace. Clear color fiber schematics are posted inside the door of the rack, and the rack is equipped with a marker box, which can be placed inside the blank marker card to facilitate maintenance personnel to record information.

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MDF stands for Master Fiber Distribution Frame.
The horizontal side connects optical communication equipment, mainly connecting the equipment side and providing the fixing of the equipment side patch fiber (pigtail).
The inline side connects to the external fiber optic cable, mainly for the outdoor fiber optic cable to provide open stripping fixed, provide reinforcement core grounding device and can provide external cable into the end of the equipment.
The inline and horizontal rows are connected by patch cords for distribution of communication routes.

This rack is suitable for medium or large server rooms with centralized fiber management.

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1.The top of the cabinet can be connected to the server room cable channel, the cabinet mainly considers the upper into the cable, while taking into account the lower into the cable.
2, the front of the cabinet for the patch fiber deployment area, the reverse side of the cable deployment area, from the front of the cabinet: the cabinet inside the left and right have a column, the mounting holes for the installation of adapter panels, the rack can be configured according to the user to install the number of panels, each panel can be fixed 96 cores, each panel is equipped with a The back of the fixed rack (cable side) is fixed with a cable management frame, which is responsible for accommodating the channels of the optical fiber sheathed in the bureau cable after stripping.
3, the front of the equipment is responsible for the path management of the patch fiber, residual fiber tray storage tasks; the back is responsible for the task of fixing the bureau cable, the back is equipped with cable fixing clips.
Full frontal operation. Operable, easy to install, can be parallel to the rack, the whole alignment protection: distributed in the alignment path bend of various bending radius protection device, to ensure the protection of the entire fiber specially designed cable stripping protection device, to ensure that the cable fixed, stripping, grounding of reliable applicable to ribbon cable and bundle cable, up and down into the cable can be.

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In recent years, with the rapid advancement of light into copper, fiber to the building, fiber to the home, access network construction has ushered in the FTTx-based fiber access era, a large number of access cables converge to OLT, transmission, data and other different rooms, the number of fiber optic cable ends in the server room is increasing, the number of optical patch fiber is also increasing, the demand for optical patch fiber management and flexible scheduling is also further enhanced, but subject to the traditional However, due to the limitations of the traditional ODF frame’s own patch fiber management capability and scalability, the following problems are caused: 1.

The existing fiber optic cables into the bureau are distributed in various professional rooms, and are set up with ODF optical distribution frame, most of the services require more than two professional rooms jumping fiber to achieve, the amount of fiber optic cable between the rooms is large, the alignment and jumping fiber confusion, can not achieve unified management, not convenient for scheduling and maintenance.

The traditional ODF rack “small and comprehensive” layout structure, blurring the interface between construction and maintenance, easily causing repeated entanglement of patch fiber, which is not conducive to flexible scheduling and not suitable for larger capacity construction.

Access layer fiber optic cable and relay layer fiber optic cable into the end of the same ODF frame, the frequent construction and maintenance of access layer fiber optic cable can not guarantee the safety of the relay layer fiber optic cable, there are hidden problems.
With the further promotion of access network fiber optic strategy, the above problems will become increasingly serious. For this reason, future planning and construction in the server room should consider the installation of fiber optic main distribution frame (OMDF), used to converge a large number of access cables, and gradually solve the maintenance, management, security and other problems.

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OMDF means Optical fiber Main Distribution frame ,applies all the use and maintenance of the MDF, with inline and horizontal into the end module.
The inline side connects to the external fiber optic cable, the horizontal side connects to the optical communication equipment, which can be connected to the distribution of communication routes through the patch fiber, with horizontal, vertical, front and rear fiber channels, which is convenient for high-capacity patch fiber protection, management and expansion, and can be installed with link test ports.

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OMDF is suitable for access layer central bureau (OLT bureau) and similar central server room, used for access equipment optical cable and external metropolitan network trunk cable centralized into the end, connection scheduling and monitoring measurement, also applicable to medium and large transmission rooms, but to set up access layer MODF and trunk layer MODF respectively.OMDF

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OMDF is mainly divided into two categories: fusion and distribution integration type and fusion and distribution separation type (the height of the rack is divided into 2600mm, 2200mm, 2000mm three categories)

Integrated fusion and distribution type MODF: consists of inline side for connecting external fiber optic cable and horizontal side wiring frame for connecting optical communication equipment. The inline side and the horizontal side can be integrated racks or separated racks.
The rack mainly consists of rack top base, base, skeleton, door (when needed), optical cable fixed open stripping unit, grounding, inline module and patch fiber intake unit, horizontal module, horizontal alignment slot and accessories.
The following are introduced in accordance with the integrated rack and separated rack respectively.

Integrated rack of inline and horizontal racks for back-to-back architecture, double-sided operation, and rack structure is more fixed, single. The inline rack consists of a number of end trays into a unit, using 12-core fusion with integrated tray assembly. The horizontal rack can use 12-core fusion with integrated tray or 72-core patch panel assembly.

Separate rack consists of fiber optic cable fusion terminal frame and equipment side distribution frame, the two are two independent fiber optic distribution frame, the combination is more flexible, can achieve full frontal parallel frame structure or back-to-back parallel frame structure. In-line rack consists of a number of into the end tray into a unit, using 12-core fusion with integrated tray components, horizontal rack can use 72-core patch frame or 12-core fusion with integrated tray components.
Separate rack double-sided parallel rack program (two front and back-to-back parallel rack combination).
The combination of fiber optic patch panel of the separated rack is more flexible, in practice, according to the capacity of the server room can also be composed of multiple full frontal or back-to-back patching fiber field.

Fusing and distribution type OMDF: composed of fusing frame and distribution frame, the two are used together.
The fusion fiber frame is a rack where all the fiber cables are introduced to ground, and the pigtail splicing function is concentrated in the same subrack. The rack is composed of cable fixing, stripping, bundling, grounding, etc., and the two sides are fusion splice tray fusion splice area.

Fiber distribution rack is a rack that concentrates all termination functions in the same subrack and realizes optical transmission routing and scheduling functions. The rack is composed of outer line termination area, inner line termination area, pigtail fixing area and fiber hopping area, and each area is independent of each other. The outer and inner wires use reversible patchcord unit frames.
The fusion and distribution type OMDF is mainly based on the full single-sided operation, and the specific combination scheme is detailed as follows

The above is the combination of the current mainstream manufacturers of OMDF, and rack scheme. Double-sided shelves have a clearer division between the outer line side and the equipment side interface, but require double-sided operation; full-frontal shelves can be installed back-to-back or against the wall, which is convenient to operate. In engineering applications, suitable racks and parallel racks can be selected according to specific application scenarios, management modes, operating habits and capacity requirements of the outside line side and equipment side to build a high-capacity patch fiber field with good scalability, clear patch fiber management and flexible use.

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OMDF installation should be as close as possible to the OLT or other equipment rooms, taking into account the routing and capacity of physical channels such as outgoing pipes, building shafts and channels, etc., and can be divided into same-layer settings (or the same room) and different-layer settings, specific settings can be selected with reference to the following priority order.
1. In the case that the space conditions of the existing cable general wiring room are met, the cable measurement room is preferred for setting OMDF.
2. In the case that the existing cable distribution room space conditions are not met, OMDF equipment as far as possible with OLT equipment in the same room.
3. In the case that the existing OLT or transmission room space conditions are not met, independent OMDF rooms can be set on the same layer or on different layers.

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OMDF room try to choose a room with sufficient length, so that OMDF is placed in one column as much as possible to form a fiber-hopping field. If it is divided into two columns, the jumping fiber between columns can only go to the top of the rack, which is not conducive to maintenance.
When OMDF and other equipment are set up in the same room, the room area should be based on the final capacity of the room, taking into account the space required for OMDF, OLT, dedicated access equipment and power supply and other equipment and reserved space; when different rooms are set up, only the space required for OMDF and reserved space should be considered, while the installation location of online test equipment should be considered. omdf
1. Suggestions for connection between OMDF and equipment
When connecting between OMDF and equipment, it is recommended to use pigtail cable. According to different use scenarios, you can choose double-headed or single-headed (fused in the OMDF equipment side fusion tray) tail cable.
Note: When set up in the same room or layer, the length of pigtail cable between OMDF and equipment is better controlled, it is recommended to use double-headed pigtail connection or pigtail connection; when set up in different layers, the length of pigtail cable between OMDF and equipment is more difficult to measure, build OMDF-headed pigtail cable or use the manufacturer’s customized single-headed indoor fiber optic cable connection with pigtail, and use 12-core fusion distribution integration tray on the equipment side of OMDF rack. OMDF

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With the promotion and use of OMDF, gradually solve the existing optical cable management confusion, expansion difficulties, maintenance difficulties and other problems. However, the introduction of each new product requires a certain break-in period, which prompted us to continue to study how to converge with the existing network evolution and long-term deployment plan to meet the large number of future user service needs.