3M ST MM Plate, 12 Port, Operating instructions

January 1997

34-7041-4699-1-A

8400 Series

Fiber Distribution System

Instructions

Contents:

1.0 General ...............................................................................................................................................3

2.0 System Components...........................................................................................................................4

3.0 System Engineering............................................................................................................................5

4.0 Hardware Installation .........................................................................................................................7

5.0 Cable Installation................................................................................................................................11

6.0 Jumper Installation .............................................................................................................................14

7.0 Front Door Installation.......................................................................................................................15

8.0 Line Assignment Card Installation.....................................................................................................15

1.0 General

1.1 The 3M

™

8400 Series Fiber Distribution System (FDU) includes four individual FDUs and a compatible

fiber management system. The FDUs are designed to provide cross-connect and interconnect between

incoming fiber optic cables and fiber optic equipment. Each FDU will accommodate up to 144 fiber

couplings. The field fibers enter the rear half of the unit and are spliced to pigtails or are connectorized

and plug into couplings that are mounted on coupling plates. The coupling plates are interchangeable,

and permit rapid adaptation to different numbers of fiber ends, coupling types, and modes.

The fiber distribution units are:

• 8425 ......... Basic model FDU.

• 8425-L ...... Same as 8425, with locking doors.

• 8425-BP ..... Same as 8425, with provisions for splicing up to 96 fibers in splice trays contained inside rear door.

• 8425-BPL . Same as 8425-BP, with locking doors.

™

8400 Fiber Management System features:

• Large cable entry ports.

• Front and rear doors.

• Cable fastening details .

• Cable attachment hardware provided.

• Cable strength member lug mounting provisions.

• Mounting positions for AT&T cable clamp.

• Mount in rack or on wall.

• Grounding lug mounting points.

• Compatible with most Fanout and Breakout Kits (8425-BP & 8425-BPL).

• Cable management hardware provided.

• Coupling plates available for ST, SC, and FC connectors.

• A line assignment card to record jumper locations.

• Optional locking of front or rear doors (8425-L & 8425-BPL).

• 8470 Fiber Management System: Upper Trough(1) , Vertical Organizers (5), Lower Trough (1).

• 8475 Vertical Jumper Organizer: (5) Vertical Organizers.

8425 FDU 8425-BP FDU

2.0 System Components

2.1 FDU and Associated Hardware:

2.1.1 The Fiber Distribution Unit carton contains:

Assembled housing (A)

Mounting hardware package (B)

Cable attachment package (C)

Cable management package (D)

Line assignment card (E)

2.1.2 Mounting hardware package:

Mounting Brackets - 2 ea. (F)

10-32 Bracket Mounting Screws - 4 ea. (G)

12-24 Rack Mounting Screws - 4 ea. (H)

2.1.3 Cable attachment package:

Cable Ties - 2 ea. (I)

Grounding/Strength Member Lug - 2 ea. (J)

1/4-20 x 1/2 Lug Screws - 2 ea. (K)

1/4-20 Hex Nut - 2 ea. (L)

Hose Clamps - 2 ea. (M)

2.1.4 Cable management package:

Fiber Routing Clips - 8 ea. (N)

Fiber Ring Guides - 6 ea. (O)

Edge Grommeting - 2 ft. (P)

1 1/4" Caplugs - 2 ea. (Q)

F/O Tray Strap - 1 ea. (R) (8425-BP & BPL only)

2.1.5 Packed inside FDU Unit:

™

Fibrlok

™

2524-FT Fiber Splice Tray (1 ea.)

(8425-BP & 8425-BPL)

2.2 Fiber Management hardware

2.2.1 3M

™

8470 Fiber Management System

Upper Trough (A)

Vertical Jumper Bracket - 5 ea. (B)

Lower Trough (C)

2.2.2 3M

™

8475 Vertical Jumper Organizer

Vertical Jumper Bracket - 5 ea. (B)

2.3 Coupling plates are ordered separately and are

available in all popular styles and counts

2.4 3M

™

Optional Accessories:

2.4.1 4460-D Scotchlok

™

Shield Bond Connector

2.4.2 2524 Splice Organizer Tray (for Fibrlok splices)

2.4.3 2524-FT Splice Organizer Tray (for fusion splices)

2.4.4 2529 Fibrlok™ Optical Fiber Splice

2.4.5 3M fiber optic connectors, cable assemblies, and pigtails

3.0 System Engineering

3.1 Intended Location: The 3M

™

8400 Fiber Management System components are designed to be used

indoors or in an enclosure to provide an environment which is generally free from blowing dust and dirt

or excessive temperature and moisture swings. A communications closet, equipment room, central

office, computer room, headend, or hub office, provides an appropriate environment.

3.2 Access Requirements: The 3M

™

8425 Series Fiber Distribution Units are designed for both front and

back access. Back access is required only in installations in which rework or expansion of the fiber area

behind the coupling plates is expected after installation. Back access is typically provided through rack

mounting.

3.3 Fiber Capacities and Radii: An 8425 Series FDUs can hold up to 12 single 8400 series coupling plates.

These can be configured to give as many as 144 fiber ports in a single unit. The housing is equipped

with jumper exits to allow jumper slack to be stored outside the housing. The jumper exits also permit

guided jumper runs from one housing to another. The housing allows installation and use with all fiber

bends maintained at a radius of 1.5" (38 mm) or more.

System Jumper Capacities:

(All capacities are approximate and are dependent on management techniques)

Jumper

Diameter Top Trough Bottom Trough Vertical Organizer

3.0 mm 432 fibers 792 fibers 648 fibers

2.0 mm 1080 fibers 1872 fibers 1512 fibers

1.5 mm 1872 fibers 3312 fibers 2664 fibers

3.4 System Mounting and Size: The 3M

™

8400 Series FDUs can be rack or wall mounted with the brackets

provided. The brackets allow for 19" (48.3 cm) or 23" (58.4 cm) rack mounting on C.O. or EIA hole

spacings. Up to 9 FDUs may be mounted in a 7' rack along with the 8470 or 8475 Jumper Management

Systems.

The 8425 and 8425-L FDUs fit within the 12" (30.5 cm) depth requirement for central office applications with

front and back access. The 8425-BP and 8425-BPL FDUs have a maximum depth of 12 1/2" (31.7 cm).

There is no protruding hardware on either the front or the back of the units to snag jumpers or sustain

damage. The front door swings out and down when opened. It completely clears the front of the unit

mounted below it.

For 23" racks 22 1/4" (565 mm)

For 23" racks 23" (584 mm)

For 19" racks 18 1/4" (463 mm)

For 19" racks 19" (483 mm)

17" (432 mm)

6 11/16"

(170 mm)

8425-BPL 12 1/2" (317 mm)

8425-BP 12 3/8" (314 mm)

5 1/4" (133 mm)

8425 & 8425-L 12" (305 mm)

5 1/4" (133 mm)

3.4.1 8425 FDU Unit Dimensions:

4.0 Hardware Installation

4.1 3M

™

8470 or 8475 Fiber Management System Hardware

4.1.1 If either the 8470 or 8475 management system hardware is to be installed they must be installed before

the 8425 FDUs.

4.1.2 If a 19" (48.3 cm) rack is being used refer to figures 4.1.2 A and 4.1.2 B page 8 for proper configurations.

4.1.3 If a 23" (58.4 cm) rack is being used refer to figures 4.1.3 A and 4.1.3 B page 9 for proper configurations.

4.1.4 Notice that the configuration of the individual vertical jumper organizer unit is different for 19" and 23"

racks. Refer to figures 4.1.4 A and 4.1.4 B below. All vertical Organizers are shipped configured for

23" racks. To configure them for 19" racks remove the four screws from the rear of the organizer and

rotate the plastic retainer and reinstall the screws. Do not over tighten.

Note: 23" (58.4 cm) racks can be positioned adjacent to one another.

19" (48.3 cm) racks will require a separation of 3 1/8" (79 mm) between the frames.

4.1.5 For both the 8470 or 8475 management hardware the FDU mounting brackets will be installed for

19" (48.3 cm) racking.

4.1.4 B

Vertical Jumper

Organizer Configured

for 23" (58.3 cm) Rack

4.1.4 A

Vertical Jumper

Organizer Configured

for 19" (48.3 cm) Rack

4.1.2 B

8470 Fiber Management System

Configuration

4.1.2 A

8475 Vertical Jumper Organizer

Configuration

19" (48.3 cm) Rack Configurations

4.1.3 B

8470 Fiber Management System

Configuration

4.1.3 A

8475 Vertical Jumper Organizer

Configuration

23" (58.4 cm) Rack Configurations

4.2 Mounting Brackets:

4.2.1 Open the mounting hardware bag which contains two

mounting brackets, four 10-32 screws and four 12-32

rack mounting screws.

4.2.2 For 19" (48.3 cm) rack mounting attach the brackets to

the housing as shown, using two 10-32 screws for each

bracket. Be sure that the long side of the bracket lay

against the housing.

Note: This position is used with 8470 and 8475

management hardware.

4.2.3 For 23" (58.4 cm) rack mounting attach the brackets to

the housing as shown, using two 10-32 screws for each

bracket. Be sure that the short side of the bracket lay

against the housing.

Note: Some CEV equipment racks require about 1"

(25.4 mm) more front extension for door clearance in

the lowered position. Reverse the brackets so the

rack flanges are to the rear and the door will clear.

4.2.4 Mount the housings to the rack (or vertical organizers)

using the four number 12-32 screws provided.

4.3 Wall Mounting:

Mount the brackets to the housing as shown. The

addition of shelf brackets for additional support is

recommended. Use of the rear door is optional. Use

appropriate anchors and screws to mount the shelf

brackets and housing securely to the wall. It is

recommended that the box be cable configured before

wall mounting. If access to the rear is required allow at

least 3.5" (90 mm) above each wall mounted housing for

removal of the housing top.

4.4 Equipment Cabinet Housing (Front Support):

Note: For this application, spare part Number 78-8095-7067-0

must be ordered.

Mount the brackets to the housing as shown. Insert the

screws through the two lower holes in the bracket and

into the threaded holes in the housing. Mount the

support rails which hold the weight of the cabinet (as

supplied by the maker of the rack) to the front and rear

cabinet supports.

Note: These rails are required to hold the weight of the

unit. Do not omit them.

4.5 Coupling Plates:

From the front of the FDU install coupling plates into

the coupling plate frame as shown. Insert the bottom of

the plate first, then press the top of the plate into position

and push on the mounting pin to lock the plate in place.

Reverse the procedure to remove a plate.

Note: Be careful when removing a plate not to disturb

attached or adjacent fibers any more than necessary.

5.0 Cable Installation

5.1 Securing Cable:

5.1.1 If the 3M

™

8425 or 8425-L are being used remove the

rear door by pushing on each side near the top as shown,

until it unsnaps and then lift the door up and out.

5.1.2 Open the Cable attachment package that contains the

cable ties, hose clamps, grounding/strength member lugs,

1/4-20 screws and 1/4-20 nuts.

5.1.3 Cables can enter FDU on either side from top or bottom.

5.1.4 Determine where the cables will enter and mount

grounding and strength member lugs as needed

using the 1/4-20 screws and nuts as shown.

5.1.4.1 If the incoming cable is entering the FDU from

above on the left side, the buffer tube will meet the

bottom of the housing and move towards the other

side. 10' (3 m) of cable buffer tube is to be exposed

Rear View

buffer tube

left

top

cable

1/2

buffer tube

top

Rear View

1/2

right

cable

5.1.4.2 If the incoming cable is entering the FDU from below

on the right side, the buffer tube will meet the top of the

housing and must move across the top then down the left

side onto the bottom of the FDU. Use the Fiber Routing

Clips found in the cable management package to manage

these buffer tubes as they cross the top of the housing.

12 feet (3.6 meters) of cable buffer tube is to be exposed.

5.1.6 Strip and prepare the cable end per your standard practice keeping the following in mind.

5.1.6.1 The cable fastener (hose clamp or cable tie) must be on the cable sheath when the cable is installed and

only the buffer tube enters the FDU.

5.1.6.2 Trim the central strength member so that 5 1/2" (14 cm) is exposed for securing in lug.

5.1.7 If the cable is to be grounded a 3M

™

Scotchlok

™

4460-D Shield Bond Connector should be installed now.

5.1.8 Insert the cable strength member into the lug and feed the

cable into the back of the FDU as shown. Tighten the set

screw on the lug to secure the strength member. Attach

cable to the FDU using a hose clamp or a cable tie.

Note: The 3M

™

2143 Cable Addition Kit may be used to

secure the cable.

Note: 3M

™

Scotch Linerless Rubber Tape may be used to

protect cable jacket.

5.1.9 If the cable is to be grounded attach grounding braid.

5.1.5 If the 3M

™

8425-BP or 8425-BPL are being used open

the rear door by pushing on each side near the top as

shown, until it unsnaps and then swing it down until it

stops.

5.1.5.1 Open the Cable attachment package that contains the

cable ties, hose clamps, grounding/strength member lugs,

1/4-20 screws and 1/4-20 nuts.

5.1.5.2 If the incoming cable is coming down the rack from

above, it should enter the FDU on the left side (when

standing in front of the rack).

5.1.5.3 If the incoming cable is coming up the rack from

below, it should enter the FDU on the right side (when

standing in front of the rack).

5.1.5.4 Repeat step 5.1.4.

5.2 Direct Fiber Connectorization:

5.2.1 Trim buffer tubes to the middle of the bottom floor of the FDU.

5.2.2 Install appropriate connectors on the fibers.

Note: Consult connector manufacturer’s instructions for information on the proper installation of fiber

optic connectors.

Danger: Fiber ends and unmated connectors may emit invisible laser or LED radiation. Avoid direct eye

exposure to the beam. Do not inspect with magnifying instruments. Protective dust caps should be

kept on all unmated couplings and connectors.

5.2.3 Locate and open the cable management package that contains the eight fiber routing clips, six fiber ring

guides, edge grommeting, two 1 1/4" (3.2 cm) cap plugs and F/O tray strap.

5.2.4 As the connectors are installed and placed into the appropriate couplings use the 8 adhesive backed stick-

on fiber routing clips to dress and store the extra fiber in the back of the FDU.

5.2.5 Any extra incoming fibers should be stored in the fiber routing clips.

5.2.6 Install the rear door by placing the bottom edge between the catches on the bottom of the FDU and then

pushing it into the top of the FDU until it snaps into a closed position.

5.3 Pigtail Splicing (8425-BP or 8425-BPL FDUs):

5.3.1 Trim buffer tubes to the middle of the bottom floor of the FDU.

5.3.2 Open up the 3M

™

Fibrlok

™

2524-FT splice tray that is packed inside the FDU and install it using the

™

Dual-Lok material per instructions packed with the 2524-FT splice tray. The locating tabs on the

2524-FT splice tray fit into the slots in the back pack door. Install the proper splice inserts into the tray.

Be sure to read the 2524-FT tray instructions.

Note: The 2524-FT Tray has a capacity of 24 fusion or Fibrlok mechanical splices. Additional trays

maybe required.

Danger:Fiber ends and unmated connectors may emit invisible laser or LED radiation. Avoid direct eye

exposure to the beam. Do not inspect with magnifying instruments. Protective dust caps should be

kept on all unmated couplings and connectors.

5.3.3 Cut two 16" (40.6 cm) lengths from the gray buffer tube and slip over the 250 micron fiber.

5.3.4 Slip the end of the buffer tube over the end of the incoming cable buffer tube and install the other end of

the buffer tube into the 2524-FT tray.

5.3.5 Install the proper number of pigtailed connectors for the number of splices to be made into the

appropriate couplers.

5.3.6 Cut the remaining gray buffer tube into six 11" (28 cm) lengths.

5.3.7 Slip four 900 micron pigtails trough each buffer tube. Install one end of the buffer tube into the 2524-FT

tray and dress the other end as required. Extra 900 µm fiber will be stored in the FDU.

5.3.8 Splice the pigtails to the cable per your companies standard practice.

5.3.9 Locate and open the Cable management package that contains the eight fiber routing clips, six fiber ring

guides, edge grommeting, two 1 1/4" (3.2 cm) Caplugs and F/O tray strap.

5.3.10 Use the eight adhesive backed stick-on fiber routing clips to dress and store the 900 micron pig tails in

the back of the FDU. Dress and store the 250 micron fiber into the 2524-FT splice tray.

5.3.11 Close the cover of the 2524 tray.

5.3.12 If additional splicing is needed, install addtional 2524-FT splice trays. Refer to 2524-FT tray

instructions in Section 6.0.

5.3.13 When all splicing is complete wrap the 3M

™

Hook-n-Loop

F/O Tray Strap around the splice trays by slipping it under

the first installed tray and fastening the two ends together.

Store extra strap.

5.3.14 Any extra incoming fibers should be stored in the fiber

routing clips

5.3.15 Close the door by swinging it up and snapping it into a

closed position.

5.4 Other Splicing and Fanout Installation:

Some installations or repairs may require very low count splice capabilities. 3M has a Fibrlok

™

Mounting

Clip (#78-8093-1646-2) for these situations. This clip may be installed on the floor in the rear of the

housing, using double-faced adhesive. It should be placed at an angle in the center of the floor with the

fiber dressed to form loops around the clip. Contact your local 3M Sales Representative for more

information at 1-800-426-8688.

6.0 Jumper Installation

Danger:Fiber ends and unmated connectors may emit invisible laser or LED radiation. Avoid direct eye

exposure to the beam. DO NOT inspect with magnifying instruments. Protective dust caps should

be kept on all unmated couplings and connectors.

6.1 Open the front door by pulling on each side at the top until it unsnaps and then swing it down.

6.2 Remove the line assignment card.

6.2 Snap the six black fiber ring guides into the square holes in the front floor of the FDU.

6.3 Install the jumper connector into the appropriate coupling. Dress the jumper fiber to minimize tight

bending stress or tension, using the fiber ring guides. Jumpers can enter the FDU on either side.

6.4 Mark the jumper routing on line assignment card.

7.0 Front Door Installation

Note: In some cases, the front door may need to be installed. For those cases follow these instructions:

7.1 Remove the protective strip from the adhesive on the bottom of the door.

7.2 Insert one end or corner of the door into the hinge as shown.

7.3 Rotate the opposite end of the door down and into the hinge.

7.4 Press door down firmly into hinge and close door to check

that door is fully seated into hinge.

8.0 Line Assignment Card Installation

8.1 Slip the card into the groove in the hinge behind the front door. More clearance can be obtained by

rotating the front door slightly forward. The card is lined for plates containing 6 or 12 couplings on one

side, and plates containing 8 or 12 couplings on the other side. Fold the card as needed for the couplings

used.

Important Notice

All statements, technical information and recommendations related to the Seller's products are based on information believed to be

reliable, but the accuracy or completeness thereof is not guaranteed. Before utilizing the product, the user should determine the suitability

of the product for its intended use. The user assumes all risks and liability whatsoever in connection with such use.

Any statements or recommendations of the Seller which are not contained in the Seller's current publications shall have no force or effect

unless contained in an agreement signed by an authorized officer of the Seller. The statements contained herein are made in lieu of all

warranties, expressed or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose

which warranties are hereby expressly disclaimed.

SELLER SHALL NOT BE LIABLE TO THE USER OR ANY OTHER PERSON UNDER ANY LEGAL THEORY, INCLUDING BUT NOT

LIMITED TO NEGLIGENCE OR STRICT LIABILITY, FOR ANY INJURY OR FOR ANY DIRECT OR CONSEQUENTIAL DAMAGES

SUSTAINED OR INCURRED BY REASON OF THE USE OF ANY OF THE SELLER'S PRODUCTS THAT WERE DEFECTIVE.

Telecom Systems Division

6801 River Place Blvd.

Austin, TX 78726-9000

800/426-8688

Litho in USA

Recycled paper

40% pre-consumer

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3M ST MM Plate, 12 Port,, FC SM Plate, 8 Port,, FC/APC SM Plate, 6 Port, Angle Polish, SC MM Plate, 8 Port,, ST MM Plate, 8 Port, Operating instructions

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