CommScope FOSC 450 A User manual

FOSC 450 A
I N STALLATION I N STRUCTION
Fiber Optic Splice Closure
1.0 General Product Description
FOSC 450 ber optic splice closures use compressed-gel cable
seals to environmentally seal ber cable splice points. The
maximum single splice capacity of the FOSC 450 A closure is
96 with 24 splices stored on four trays. The maximum mass
fusion splice capacity is 216 with 6 splices on three trays. This
closure can be direct buried, pole-mounted, aerial-mounted, or
placed in a hand hole or man hole.
Note: Cable blocking is not recommended in this closure
due to space constraints.
2.0 Kit Contents
Dome and clamp
¥Base and o-ring ¥
FOSC-ACC-A-Tray-12 or 24
¥Metal slack basket (optional)
¥Gel end-piece ¥
¥Velcro strap
¥Cable termination hardware
¥Hose clamps
¥Strength member attachment bracket
3 Bond wires (optional)
¥Tie wraps
¥1/4” Nut driver
¥LBT Wrap
¥Transportation Tubes
Spiral transportation tube kit (optional)
¥Multi-Drop Kit (optional)
Cleaning Tissues
Identication Labels
FOSC 450 - a b - c - dd - e - f g h
Closure Size (A)
Number of Cable Ports (4)
Number of Cable Ports
with termination hardware
2 = two ports
3 = three ports
4 = four ports
Splice Tray Capacity
12 = 12 splices per tray
24 = 24 splices per tray*
NT = No trays Number of Pre-installed Trays
1 = 1 tray
NT = no trays
Basket Type
N = none
A = standard basket
T = tall basket
Number of Ground
Feed-through lugs
1 = one lug
0 = no lugs
Includes Valve
for Flash Test
V = Yes (standard)
N = No
*SMOUV protection sleeves are required
to achieve 24 splice per tray capacity
Note: Store unused components and installation instruc-
tions in bag and keep inside closure for future cable
terminations. If these parts are lost, you will need to
order a FOSC-450-CABLE-TERM kit to terminate future
cables.

Page 2
Other Accessory Kits: Usage
FOSC-ACC-CABLE-TERM extra cable termination
hardware
FOSC-ACC-A8-Basket fiber storage basket
FOSC-ACC-A8-Basket-Tall larger capacity basket
FOSC-ACC-WALL/POLE-MOUNT mounting hardware
FOSC-ACC-UNIV-AERIAL-CLMP aerial mounting hardware
FOSC-ACC-LASHING STRAPS aerial mounting hardware
FOSC-ACC-450-AERIAL-CLMP aerial mounting hardware
SMOUV Splice Protection Sleeves for single-fiber splices
FOSC-ACC-450-Workstand Workstand for installations
FOSC-ACC-SPR-TUBE-3/8-50 3/8” dia. spiral tubing
FOSC-ACC-SPRL-TUBE-3/16 3/16” dia. spiral tubing
Use these accessory kits to seal multiple small cables in a single
port:
FAK-450SEAL-1-NO/CBL-AT
Closure type
No. Cables per Port With or without
cable attachment
3.0 Open Closure
Note: Before opening a sealed closure, use the valve in the
dome to bleed all air from the closure.
1. Remove the dome-to-base clamp. Pull the clamp slightly
to the side and lift the clamp handle, using the feet of the
clamp to pry against the two posts to spread the clamp
open. Open one side of the clamp all the way and pull it
back on itself quickly to remove it from the dome and
base. (Fig. 1)
2. Remove the dome from the base of the closure.
3. If gel seal is already installed, loosen the gel seal by turn-
ing the tail section counter-clockwise until seal is loose.
4. Loosen and turn the two metal latches clockwise and
remove the base from the frame. (Fig. 2)
5. Slide the closure base (small end first) over the main
cables to be installed in the closure and proceed with
cable preparation.
Tip: Tighten the latches in a clockwise direction to make it
easier to remove and reinstall the base later.
Tip: Using a FOSC ACC 450 closure workstand makes
installations easier.
IMPORTANT: Small round or flat cable installations -- If
cables are less than 0.35” in diameter or flat drop style, an
additional step is required for cable sealing in the port. In
this case the cable diameter must be built up to the mini-
mum 0.35” diameter. In addition, if multiple small cables
like these are to be installed in a single port, it is impera-
tive that gel is applied between the cables before installing
them into the gel port. See FOSC 450 Small/Seal-3 or -4
Cable Kit installation instructions or FOSC 450 Single
Small Cable Kit installation instructions for further details.
Handle
Pin
Notch
Feet
Post
1
23
Cable Opening Max. Slack
Type Location Storage Length
LBT Midspan 55” - 72”
Central Core Tube Midspan 52” - 74”, 84”
Loose Fiber
Central Core Tube Midspan 52” - 75”
Ribbon
60” allows for one loop of slack in the basket and 36” of
fiber on the splice tray.
Table 1: Midspan (Main) Cable Opening Lengths
Figure 1
Figure 2

Page 3
Strength member 1.5''
Strength
members 2''
Central core tube 6"
4.0 Main (Midspan) Cable Preparation
4.1 Loose Buer Tube (LBT) Main Cable Preparation
Note: The maximum slack storage lengths listed in the
chart to the right will be limited with higher count Loose
Buer Tube (LBT) cable.
1. Refer to Table 1 for appropriate opening length. Ring cut
and remove the outer cable sheath and shield (if present).
Remove the ber yarns and cloth, trim at ring cut. Clean
bers.
Note: Leave a short length of ripcord at each ring cut.
2. Install bonding hardware on shielded or armored cable
(optional).
Warning: Do not use a braided or stranded ground wire
when installing a ground through a port on the FOSC 450
closures. CommScope requires that a bonded solid
ground wire be used to prevent a leak path and make a
proper seal.
a. Pull the ripcord 1” past the ring cut.
b. Peel open both shield and sheath.
c. Attach the alligator clip under the shield and over the
sheath and crimp down.
d. Wrap exposed area with vinyl tape.
3. Cut the strength member(s) 1.5” from the ring cut. (Fig. 3)
4.2 Central Core Tube (Loose Fiber or Ribbon) Main
Cable Preparation
1. Refer to Table 1 for appropriate opening length. Ring cut
and remove the outer cable sheath and shield (if present).
Remove the ber yarns and cloth, trim at ring cut.
Note: Leave a short length of ripcord at each ring cut.
2. Install bonding hardware on shielded or armored cable
(optional)
a. Pull the ripcord 1” past the ring cut.
b. Peel open both shield and sheath.
c. Attach the alligator clip under the shield and over the
sheath and crimp down.
d. Wrap exposed area with vinyl tape.
3. Cut the strength member(s) 2” from the ring cut.
4. Ring cut the core tube 6” from each sheath ring cut. Split
and remove core tube between ring cuts. Clean exposed
bers or ribbons with approved degreaser. (Fig. 4)
5.0 Main Cable Installation
If uncut midspan bers are to be routed to a tray, the cable
reverse point must be centered over the midspan opening of
the cable.
1. Main cables are installed in the two smaller bottom ports.
The drop cables will be placed in the two larger top ports.
(Fig. 5)
smaller bottom
ports (main
cable)
larger top ports
(drop cables)
Slot for top port
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7

Page 4
2. Secure the strength member into the strength member
attachment bracket. The buer tubes, ribbons, or loose
bers should pass over or around the head of the strength
member attachment bolt. (Fig. 6)
Note: A nut driver is included in the kit for this purpose.
Note: The “stem” of the bracket must be in-line with the
cable jacket. Hold the bracket in place while tightening
the bolt to prevent unwanted rotation.
Note: If the strength member diameter is too large,
remove the outer PE jacket from the strength member.
3. Insert strength member bracket into the slot in the frame.
(Fig. 7)
4. Place the cables between the cable retention brackets.
Secure the cables with the supplied hose clamp. (Fig. 8)
Tighten the clamp such that the retention teeth fully seat
into the cable assembly. Do not tighten to the point that
the clamp deforms.
Note: The head of the hose clamp has to be positioned on
top of the cable retention bracket. Otherwise it might inter-
fere with the base when assembled. (See Fig. 8)
5. Secure the strength member into the strength member
fork.
5.1 Slack Storage
1. Route the loose buer tubes or core tubes of the main
cable to the metal basket for storage. Attach the loose
buer tubes or core tubes to each side of the basket with
two tie wraps.
Note: For loose buer tubes, separate the tubes contain-
ing the bers to be spliced and let them hang to the side.
They should not be secured to the slack basket with the
uncut tubes.
2. Form the loose buer tubes, ribbons, or bers into loose
loops and place them in the slack basket. (Fig. 9)
6.0 Cable (End) Preparation
6.1 Loose Buer Tube (LBT) Cable Preparation
1. Refer to Table 2 for opening length. Ring cut and remove
the outer cable sheath and shield (if present). Remove the
ber yarns and cloth, trim at ring cut. Clean buer tubes.
Note: Leave a short length of ripcord at each ring cut.
2. Install bonding hardware on shielded or armored cable
(optional).
Warning: Do not use a braided or stranded ground wire
when installing a ground through a port on the FOSC 450
closures. CommScope requires that a bonded solid
ground wire be used to prevent a leak path and make a
proper seal.
Cable Opening Max. Slack
Type Location Storage Length
LBT End 36” - 48”
Central Core Tube End 36” - 48”, 58”
Loose Fiber
Central Core Tube End 70”
Ribbon
Table 2: Drop (End) Cable Opening Lengths
Strength member 1.5''
Figure 8
Figure 9
Figure 10

Page 5
a. Pull the ripcord 1” past the ring cut.
b. Peel open both shield and sheath.
c. Attach the alligator clip under the shield and over the
sheath and crimp down.
d. Wrap exposed area with vinyl tape.
3. Cut the strength member(s) 1.5” from the ring cut. (Fig. 10)
6.2 Central Core Tube (Loose Fiber or Ribbon) Cable
Preparation
1. Refer to Table 2 for opening length. Ring cut and remove
the outer cable sheath and shield (if present). Remove the
ber yarns and cloth, trim at ring cut.
Note: Leave a short length of ripcord at each ring cut.
2. Install bonding hardware on shielded or armored cable
(optional)
Warning: Do not use a braided or stranded ground wire
when installing a ground through a port on the FOSC 450
closures. CommScope requires that a bonded solid
ground wire be used to prevent a leak path and make a
proper seal.
a. Pull the ripcord 1” past the ring cut.
b. Peel open both shield and sheath.
c. Attach the alligator clip under the shield and over the
sheath and crimp down.
d. Wrap exposed area with vinyl tape.
3. Cut the strength member(s) 2” from the ring cut.
4. Ring cut the core tube 1” from the sheath ring cut and
remove core tube. Clean exposed bers or ribbons with
approved degreaser. (Fig. 11)
7.0 Drop Cable Installation
IMPORTANT: Drops greater than .3” in outside diameter
are installed in the same way that main cables are
installed. Refer to Section 5.0 for instructions.
However, drops less than .3” in outside diameter must be
installed together in one port, using the FOSC 450 3-Drop
kit for at drop cables, or the FOSC 450 4-Drop kit for
round drop cables. Instructions for preparing and installing
multiple drops are included with those kits.
8.0 Route Fibers For Splicing and Storage
on Trays
Note: Begin splicing on the bottom tray closest to the
metal slack basket. Other empty trays can be removed
until needed.
8.1 LBT Main (Midspan) Cable Routing
1. Route the selected uncut LBT to the tray as shown and
mark the buer tube 1” from the back of the tray at each
side. (See Figures 12 and 13)
2. Shave the LBT back to each mark on the tube and remove
section of LBT.
Figure 12
Figure 13
Figure 14
Strength
members 2''
Central core tube 1"
Figure 11

Page 6
3. Clean exposed fibers with an approved cleaning solution.
4. Wrap LBT wrap around each LBT where it enters the tray.
5. Secure each side of the LBT to the tray with tie wraps.
(See Fig. 14) Tie wraps should be over the LBT wrap.
6. Loop fibers around the perimeter of the tray as shown
until ready to splice.
8.2 LBT Cable (End) Routing
Note: If the LBT cable contains the older style stiff LBT’s, it
may be necessary to install a flexible transportation tube
over the LBT for routing.
1. Route the loose buffer tubes from the drop cable either to
the basket for slack storage or directly to the tray for splic-
ing. (Fig. 13)
2. Route the LBT to be spliced onto the tray, making sure
there is enough length for tray hinging. Mark the tube 1”
from the back of the tray (as shown Fig 13). Ring cut and
remove buffer tube.
3. Clean and dry fibers with an approved cleaner.
4. Wrap LBT wrap around the LBT at the end of the ring cut.
5. Use two tie wraps to secure the tube to the tray. (Fig. 14)
6. Splice and store the designated fibers into the tray first.
See Figure 15 and Figure 17 for tray routing recommen-
dations.
7. Store the uncut fibers last. This will allow easy access to
the uncut fibers if they need to be spliced at a later time.
8.3 Central Core Tube Loose Fiber Main (Midspan)
Cable Routing
1. Central core tubes containing loose fibers can be routed
directly to the slack basket or to the non-hinging bottom
tray and secured with tie-wraps. Do not over tighten tie-
wraps.
2. Select fiber(s) to be cut or routed.
Note: Selected midspan fibers can be cut in the middle of
the loop to splice to either end. If more length is needed,
cut offset from midpoint (short end fibers will be dead to
the field).
3. Fibers are transported to the opposite side of the basket
and routed to appropriate trays using the transportation
tubes. Attach transportation tubes to the basket. Tubes
can be identified at both ends with feeder (blue) and distri-
bution (white) labels. Route transportation tube behind
the tray tower and attach to tray with tie wraps.
4. Splice and organize fibers as appropriate.
8.4 Central Core Tube Loose Fiber Cable (End)
Routing
1. To route the cable’s loose fibers to the splice tray or to the
slack basket for storage, use spiral tubing (order separately).
Allowing a generous length for tray hinging and attach-
ment to the tray/basket, cut the spiral tubing to length
and install it over the fibers and the central core tube.
Feeder
7-12
Feeder 1-6
Distribution 7-12
Distribution 1-6
Feeder and Distribution shown together
WRONG! Both of these patterns
could cause signal attenuation!
Do not
store fiber
inside arcs
Do not
store fiber
inside arcs
Do not store fiber inside the arcs on the tray!
Arcs Arcs
Spiral Transportation Tubing
Central Core Tube 1"
Figure 15
Figure 16

2. Push the spiral tubing all the way up between the strength
members and the central core tube. (Fig. 16)
3. Wrap the ends of the spiral tubing with LBT wrap before
securing it to the tray or the basket with two tie wraps.
The tie wraps should be located over the LBT wrap. Do
not overtighten the tie wraps.
4. Splice and organize fibers as appropriate.
8.5 Central Core Tube Ribbon Main (Midspan) Cable
Routing
Note: For standard trays, route ribbons to the slack
basket, not directly to the trays unless the ribbons will be
de-ribbonized for single splicing. Do not store ribbon slack
on the tray.
1. Separate and select ribbons to be cut or routed.
Note: Cut selected midspan ribbons in the middle of the
loop to splice to either end. This will allow 15” to 24” for
splicing. If more length is needed, cut offset from midpoint
(short end ribbons will be dead to the field).
2. Transport ribbons to the opposite side of the basket and
route to appropriate trays using the ribbon transportation
tubes (green rubber band group). Attach transportation
tubes to the basket leaving 6” in the basket. Tubes can be
identified at both ends with feeder (blue) and distribution
(white) labels. Route the transportation tube behind the
tray tower and attach to tray with tie wraps.
Note: Arrange the order and orientation of ribbons at the
slack basket before inserting them into the transportation
tube. This will eliminate crossing of ribbons on the tray.
3. Feed organized groups of six ribbons into the tubes in the
basket and push ribbons through transportation tubes onto
the tray leaving a small loop in basket. Ribbons on one
side of transportation tube may need to be oriented in an
opposite order to prevent crossover of ribbons on the tray.
4. Pull enough ribbon length through the transportation
tubes to complete splicing.
5. Splice ribbon ends, allowing a generous bend when rout-
ing (six splices per tray recommended). (Fig. 17)
6. Ribbons can be pushed from one end and pulled back into
the basket. Pull all ribbons in the group at the same time.
Note: Do not store ribbon loops on the standard tray.
7. Store slack ribbon length in the slack basket and hold
down stored ribbons with tie-wraps. Leave the tie-wraps
loose to avoid unnecessary pressure in the ribbons.
8.6 Central Core Tube Ribbon Cable (End) Routing
Note: Route ribbons to the slack basket, not directly to
the standard trays unless the ribbons will be de-ribbonized
for single splicing. Do not store ribbon slack on the tray.
1. To route the ribbons to the splice tray or to the slack basket
for storage, use spiral tubing (order separately). Allowing a
generous length for tray hinging and attachment to the
tray/basket, cut the spiral tubing to length and install it
over the ribbons and the central core tube.
High capacity splicing for 250 micron fiber only
splices 1-12
High capacity splicing for 250 micron fiber only
splices 1-12
24 splices per tray using SM12 modules
Ribbon routing. Do not store ribbons on
standard trays; pull slack back into slack
basket. Use SM6 module only
Upper module not used in this example
Perimeter routing, for splicing 12 fibers
using SM 12 module
Note: SMOUV splice protection sleeves must be used if 24
splice per tray capacity is needed.
Figure 17
Page 7

2. Push the spiral tubing all the way up between the strength
members and the central core tube.
3. Wrap the ends of the spiral tubing with LBT wrap before
securing it to the tray or the basket with two tie wraps.
The tie wraps should be located over the LBT wrap. Do
not overtighten the tie wraps.
4. Splice and organize fibers as appropriate.
9.0 Gel End-Piece Installation
1. Make sure the gel seal is not already compressed. Turn
the “tail” of the gel seal counter clockwise to ensure that
the seal is in the un-compressed position. Squeeze the gel
seal to unlatch and open each half one at a time.
2. Hold the gel block with the hinge to the right. Install the
gel block between the installed cables as shown. Making
sure the small ports are at the bottom of the closure,
hinge the top and bottom sections and snap together.
(Fig. 18)
3. Slide the base up and over the gel seal. Align the arrow
on the outside of the base with the pointed top of the
cable/tray assembly. (Fig. 19)
4. Secure the frame to the base with the two metal latches.
5. Insert one port plug in each unused port (Fig. 20)
6. (Grounded Kits Only) Connect individual cable ground
wires to the nearest ground cable inside the base. Use #6
ground wires to externally ground the closure by attach-
ing the ground wires to the external ground feed-through
lug.
7. Turn the “tail” clock-wise until it dead ends at the positive
stop or becomes tight. A screwdriver can be installed
through the hole in the “tail” to tighten the seal. Hold the
screwdriver tightly so it does not come out.
8. Place a large tie-wrap around all the cables near the end
of the “tail”.
Page 8
main
cable drop
cable
top ports
arrow on
base
point of
cable bracket
port plug
Figure 18
Figure 19
Figure 20

Page 9
10.0 Close the Closure
1. Check to make sure the “O” ring is positioned properly on
the rim of the base.
2. Install the dome onto the base, align the arrow on the
dome with the arrow on the base. The dome should sit
flush on the base.
3. Install clamp around dome/base interface. Use the feet of
the clamp handle to close the gap in the clamp. (Fig. 21)
4. A security lock or tie-wrap may be inserted through the
round holes in the handle and clamp to lock the closure.
11.0 Test Seals
Flash test the closure to 5 psi. Thoroughly soap the seal to
check for integrity.
Note: After flash testing, release the pressure from the
closure.
12.0 Mount the Closure
This closure can be direct buried, pole-mounted or aerial-
mounted, or placed in a hand hole or man hole.
For an aerially mounted application, the FOSC-ACC-450-AERI-
AL-CLMP, FOSC-ACC-UNIV-AERIAL-CLMP, or FOSC-ACC-
LASHIN-STRAPS kit may be required. Installation instructions
are included with the kits. Refer to the FOSC 450 A Closure
Ordering Guide to determine which kit(s) are required for your
needs.
For pole-mounted or wall-mounted applications, the FOSC-ACC-
WALL/POLE-MOUNT kit is required. Installation instructions
are included with the kit.
4
Feet
Post
1
2
3
Note: Store unused components and installation instruc-
tions in bag and keep inside closure for future cable
terminations. If these parts are lost, you will need to
order a FOSC-450-CABLE-TERM kit to terminate future
cables.
Figure 21

©2001, 2009, 2016 CommScope Inc. All rights reserved PML 8B8356 F479.3/09
FOSC 450, SMOUV, CommScope logo, and CommScope are trademarks. Velcro is a trademark of Velcro Industries B.V.
The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reli-
able. However, CommScope makes no warranties as to its accuracy or completeness and disclaims any liability in connection with its use.
CommScope obligations shall only be as set forth in CommScope Standard Terms and Conditions of Sale for this product and in no case will
CommScope be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse of the product. Users of
CommScope products should make their own evaluation to determine the suitability of each such product for the specic application.
Technical Assistance Center (TAC)
Tel.: [phone]
Email: [email protected]
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