Transcript
Telecom Networks FIST-SOSA/SASA Trays
February 2012
What is Fiber Cable Management IEC 61756-1 and ITU-T L.51 defines a fiber management system as a system that provides: • Storage of fiber splices and optical components. • Overlength storage of fiber and cable with correct bending radius. • Protection. • Identification. • Optical stability by separation of optical circuits when necessary.
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ITU L.17 recommendation
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Definitions
Network Element
Single Element
Single Circuit Positive Fiber Management
• A product with a specific optical function e.g. splicing point to connect internal to external cable
• Unit of fiber handling in the cable construction e.g. 12 fibers in a loose tube
• Number of fibers required per ONU in the network e.g. 2 fibers for a bi-directional service with simplex transmission
• Physical cable and fiber routing design that 1. provides for clear one way installation 2. avoids transmission errors during normal cable and element handling e.g. well engineered bend radius control throughout the network page 4 /
Why Circuit Separation in a Fiber Management System In the optical fiber networks: • Optical fiber is subjected to handling. • Losses will occur by manipulation of active optical circuits. • The losses have the probability of being system affecting. • Losses are transient in nature.
INCREASED PROBABILITY OF TRANSMISSION ERRORS
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Definition of Transient Optical Loss 0.5 Residual loss
0.0
Optical Power ( dBm)
-0.5 -1.0 -1.5 Transient Loss
-2.0 -2.5 -3.0 -3.5 0
0.5
1
1.5
2
Time ( sec )
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Transient Loss versus Bit Errors Results of Transients in STM 64 System (1550 nm) • At high system margin of 9 dB: No errors for transients up to 8 dB • At low system margin of 1 dB: Bit errors seen for: Transient loss (dB) 0.6 1 3.5 4.5 5 5.5 6.5 8 8.5
Type of Error B1 B1,B2 B1,B2,B3 B1,B2,B3,REI B1,B2,B3,REI,TIM B1,B2,B3,REI,TIM,SYNC B1,B2,B3,REI,TIM,SYNC,OOF B1,B2,B3,REI,TIM,SYNC,OOF,LOF B1,B2,B3,REI,TIM,SYNC,OOF,LOF,LOS
Bits Bits Bits Remote Error Identification Trace Identifier Mismatch Synchronization Loss Out of Frame Loss of Frame Loss of Signal
0.5 dB transient peak loss requirement seems good selection criteria (confirmed by Telcordia – see proceedings NFOEC 2003)
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Features Fiber Cable Management System • Single Circuit Management • Positive Fiber Management • Future Proof • Network Flexibility • Improved Quality of Service • End-to-End Solution • Cost Effective
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FIST MK2 Organizer Building Blocks Universal Mounting System profile (UMS)
Ribbon 12 tray
Wrap-around groove plates for Ribbon 12
Ribbon 4/8 tray
for Ribbon 4/8
(Single Element) SE tray
for single fiber SC tray (Single Circuit) FAS routing-block cap tube FAS routing-block holder page 9 /
Universal Mounting System (UMS) • Base frame to click-in organizer systems e.g. routing blocks and wraparound groove plates • Mounted in all splicing network elements • Precision made iodinated alu frame • Allows modular and as needed built of infrastructure
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Wraparound Groove Plate for 250 Single Fiber • Optical guide and mechanical protection for and 900 micron fibers • Single circuit or single element trays • 4 units and 8 units length • Easy click-in system to UMS • One-direction routing • Break-off edge when using pigtails • Always supplied with trays (SOSA2-XSC or SE)
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Single Circuit Tray • Handles up to 4 primary coated fibers • Handles 2 secondary coated fibers • Modular splice holder area • Minimum bend radius of 30mm • Loop back facility • Integrated identification • 1 UMS unit thick
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Single Element Tray • Handles up to 12 primary coated fibers • Handles 4 secondary coated fibers • Modular splice holder area • Minimum bend radius of 30mm • Loop back facility • Integrated identification • 2 UMS units thick
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Oval Bend Indicator in SC and SE Tray • Stored fibers should not touch the oval bend indicator at the above indicated points!
Wrong
max
Correct
min.
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Passive Device housing • Housing for pre-installed passive optical devices • Compatible with planar and FBT devices • 1:2 up to 2:32 devices (nxm) • Supplied with SASA sub-assembly • 2 UMS units thick
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SASA (splitter array sub-assembly) FIST-SASA2-XX-YY-Z • X X= input/output ports splitter • Y Y= # of splitters and grade •Z
= type of spliceholder
Packed per piece ; fibers pre-routed to SC trays - assembled on base plate
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Types of Configuration in Organizers
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SASA2-14-1X-X • Network scheme
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SASA2-24-2X-X • Network scheme
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SASA2 TAM (test access module) • Network scheme
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SASA2 type : MERGER • Network scheme
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Routing Block • Routes fibers in a controlled way to the appropriate tray • Mechanical protection of installed fibers by a routing block cap • Easy click-in system to UMS at any position; typically pre-installed • 2 sizes
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Fiber management technique and capability • Fibers are routed up or down in groove plate; not both directions in one side-duct • Parallel running fibers allow transient controlled management • Below point 1 transient controlled addition of fiber • Feed-through hole allows transient controlled
Fiber addition Re-configuration by pull back technique page 23 /
Tube Holder for Boxes and Closures • Termination point for cable tubes • Compatible with any size of cable tubes up to 6.4mm • Snap-in tube holder retainer
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Tube holder for subracks • Termination point for pre-installed transportation tubes • One type for up to 27 tubes of 3.1mm in diameter. Each tube can handle 24 fibers of 250 micron • One type for up to 10 tubes of 5mm in diameter. Each tube can handle x ribbons of 4 fibers or x ribbons of 12 fibers
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Fiber Routing • Access from all corners possible due to design of Routing block
out trench
in trench
out trench
in trench
out trench
in trench
out trench
in trench
out trench
out trench
in trench
in trench
out of the hole
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Wraparound KTU • Kevlar termination unit for single fiber or ribbon pigtails • Mechanical retention up to 70N • Two single fiber pigtails or one ribbon pigtail per KTU • Single fiber pigtails up to 3.1mm in diameter • Snap-in design to KTU bracket or retainer
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Storage basket • For mass storage of looped fibers in closures and boxes in case of slotted core or central core cable • 2 sizes • Stored with hinge in between or under the UMS/ WA groove plate assembly
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A Place for Everything • Fiber pin assembled on tray lid • Tube holder retainer assembled on tray lid • Tray lid assembled on routing block • Tray wedge assembled on routing block
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From ribbons to individual pigtails • De-ribbonize in field • Ribbonize in field • Use factory made and pre-installed fan-out In GPST-12 patching trays In GMS2 splicing trays
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Organizer ordering items • FIST-SOSA2-XX-Y • FIST-SASA2-XX-YY-Z • FIST-GMS2-FORXX-XX-X • FIST-GB2-FORXX-XX-X • FIST-PTK2 • FIST-KTU2 • FIST-ADK-H1-4 • FIST-BASKET-A • FIST-BASKET-B
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End of Presentation
February 4, 2012
