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Raychem Dictionary

Acronym Full Name Description
  Adapter A device used for joining two fiber-optic connectors together.
ADK Adapter Kit  
ANSI American National Standard  
APC Angled Polished Connector  
ADSL Asynchronous Digital Subscriber  
ACPN Asia Pacific Cable Network  
ASTM American Society for the Testing  
of Materials  
ATM Asynchronous Transfer Mode  Asynchronous Transfer Mode. ATM is a high-bandwidth, low-delay, packet-like
switching and multiplexing technique. Usable capacity is segmented into fixed cells, allocated to services on demand.
  Attenuation The decrease in magnitude of power of a
transmitted signal. It is a term used for expressing the total losses on an optical fiber, and is the ratio of light output to light input. Attenuation is usually measured in decibels per kilometre (dB/km) at a specific wavelength. The
lower the number, the better the fiber. Typical multimode wavelengths are 850 and 1300 nanometers (nm); single mode
at 1300 and 1550 nm. When specifying
attenuation, it is important to note if it is nominal or average, at room temperature
or a maximum over an operating range.
  Attenuator A device inserted into the electrical or optical path to reduce the signal.
  Balanced coupler A coupler having an even ratio of power splits, i.e. 1x4 = 25/25/25/25.
  Bandwidth Measure of the information- carrying capacity of an optical fiber, normalized to a unit of MHz-km. This term is used to specify the capacity of multimode fibers only. For single mode fibers
dispersion is used.
  Baseband A technique whereby the digital input is applied directly to the transmission media, without the intervention of a
modulating device. This works well
where there is a wide bandwidth and the information only needs to travel a short distance, no further than a few hundred meters. It is commonly used by LANs and by limited distance modems. The other technique for LANs is broadband. Baseband is the simpler and more cost effective solution, with the whole of the bandwidth being used to transmit a
single digital signal.
  Bend loss A form of increased attenuation caused by either having the fiber curved around a restrictive radius of curvature, or
microbends caused by minute distortions in the fiber imposed by externally induced disturbance. Excessive bend
loss may result from poor drawing or cable manufacturing techniques.
  Bend radius A measure of how much a fiber can bend before the risk of breakage or increase in attenuation.
  Bi-directional The movement of optical signals in
opposite directions through a common fiber cable.
  Binary The basis for calculation in computers; a
numbering system having only two
possible states — On or Off as
designated by 1 and 0 respectively.
  Bit An abbreviation of "binary digit" which represents a single character in a group;
either a 0 or a 1.
  Bit rate The speed at which bit positions are
transmitted, normally expressed in bits per second
BPS Bits per second The basic unit of data communication
rate measurement. Usually refers to rate of information bits transmitted
  Breakout cable A breakout cable contains individual 900 μm fibers with kevlar and outer jacket (up to 2.8 mm) and a strength member which are bundled in an outer jacket. It can be pre- or non pre-connectorized.
  Broadband In general, covering a wide range of frequencies. The broadband label is
sometimes used for a network that
carries many different services or for video transmission.
  Buffer A protective material extruded directly onto the fiber coating to protect it from the environment.
CAB FIST Street Cabinet Street cabinets in series of FIST
  Cable assembly Fiber-optic cable with connectors
installed on one or both ends. The
general use of these cable assemblies
includes the interconnection of
multimode and single mode fiber -optic cable systems. If connectors are
attached to only one end of the cable it is known as a pigtail. If connectors are
attached to both ends it is known as a jumper.
CANTAT-3 Canada-TransAtlantic fiber optic cable  
CAN-US USA-TransAtlantic fiber optic cable  
CATV Community Antenna TeleVision Acronym for cable television.
CB FibrBoss Customer Premises boxes (sizes 0, 1, 2 and 3).  
CCJ Cable Chamber Joint Also called a vault closure
  Central core cable Cable construction where the single
fibers or ribbons are located in the center in a big, strong tube. The cable strength
members are placed outside the center.
CO Central Office A telephone company facility for
switching signals among local telephone circuits. It connects to subscriber telephones. It may also be called a
switching office.
  Cladding A low-refractive-index coating that
surrounds the core of a fiber providing optical insulation and protection.
  Colombus III Trans-Atlantic fiber optic cable
  Connector A mechanical device used to align and join two fibers together to provide a means for attaching and decoupling it to
a transmitter, receiver or another fiber. Commonly used connectors include ST compatible, STII compatible, FC/PC,
  Core The central region of an optical fiber through which light is transmitted. 
  Coupling Transfer of light into or out of an optical fiber. 
  Coupler A device that connects three or more fiber ends, dividing one input between two or more outputs or combining two or more inputs into one output.
  Cross-connect A method of connecting copper or fiber transmission plant to achieve desired configurations using two interface joints.
  Carrier Sense Multiple Access with Collision Detection or A control access method through which several nodes can transmit over one cable (multiple access) although not simultaneously.
CTR Customer Test Report  Raychem report prepared for customers.
dB Decibel The standard unit used to express gain or
loss of optical power.
∆IL Difference in insertion loss The difference between IL before testing
and IL during testing
∆ILmax Maximum difference in insertion loss  Maximum IL minus the minimum IL
DIN Deutsche Industrie Norm  Deutsches Institut für Normung
Beutch Verlag GmbH
1000 Berlin 30
  Dispersion The cause of bandwidth limitations in a
fiber. Dispersion causes a broadening of
input pulses along the length of the fiber.
Two major types are:
• mode dispersion caused by different
optical path lengths in a multimode
fiber, and
• material dispersion caused by a
differential delay of various
wavelengths of light in a waveguide
DLC Digital Loop Carrier  
  Drop cable The coaxial cable that connects the
feeder portion of the distribution system
to the subscriber’s premises.
  Duplex A duplex cable contains two fibers; a duplex connector links two pairs of
DWDM Dense Wavelength Division A passive device that transmits signals at different wavelengths through the same
Multiplexer fiber.
E-1) European standard  Its counterpart is DS-1. E-1 is
approximately at 2 Mbps, 30 digital
EN External Node  A type of closure application in a
fiber-optic ring network
ESS Exchange Splitter Point  
ETP Equipment Terminal Point  
ETSI European Telecommunications Standards Institute ETSI European Telecommunications Standards Institute
06921 Sophia Antipolis Cedex
  Fan-out A fan-out unit converts a ribbon cable to individual connectorized pigtails.
FAS FIST Fiber Arrangement System  
  Fast Packet Switching An emerging, packet-oriented, digital technology that differs from traditional packet switching in a number of ways22.
The most obvious is that it transmits all
data in a single packet format whether the information is video, voice or data.
FAS-Unit Length of 6 mm Measure for:
• length of FIST-SOSA, SASA and,splitters
• thickness of organizer trays
• available space on FAS plate.
FDDI Fiber Distributed Data Interface A standard for 100 Mbit/sec. fiber-optic
local area network.
FDP Fiber Distribution Point  
  Ferrule A mechanical fixture, generally a rigid tube, used to confine and align the stripped end of a fiber.
  Fiber optics Light transmission through optical fibers for communication or signalling.
  Fiber Channel A high speed, fiber optic network system that is intended to support transmission speeds of up to 266 Mbps inexpensively.
FDDI Fiber Distributed Data Interface A token-passing protocol that operates at 100 Mbps over fiber-optic cable. FDDI supports rings of up to 100 kilometers in length (2 kilometers between stations)
with a bi-directional token-passing scheme. FDDI is often used to
implement LAN backbones.
FIST Fiber Infrastructure System Technology  
FITL Fiber in the Loop  
FITS Factory Installed Termination System  
FOIRL Fiber Optic Inter-Repeater Link A fiber optic network link used between
Ethernet network devices. It is commonly used to support Ethernet
FOMS Fiber-Optic Management System  
FOPT-CS Fiber-Optic Protection Tube Fiber-optic transportation tube from cable to SECO
FOPT-CT Fiber-Optic Protection Tube Fiber-optic transportation tube from cable to transportation tube
FOPT-SF Fiber-Optic Protection Tube Fiber-optic transportation tube from SECO to FAS
FOSC Fiber-Optic Splice Closure  
FOSC Tray Fiber-Optic Splice Tray Fiber-optic splice tray to store different kind of splices and to handle arbitrary
fiber overlengths in a controlled manner.
FOTP Fiber-Optic Test Procedures  
  Frequency The number of cycles per unit of time, denoted by Hertz (Hz).
1 Hz = 1 cycle per second.
FSA Fiber System Accessories   
FTTP Fiber to the Business   
FTTC Fiber to the Curb   
FTTH Fiber to the Home   
FTTZ Fiber to the Zone   
  Fusing The operation of joining fibers together by fusion or melting.
GB FIST Generic Box   
GCO FIST Generic Closure Organizer  
GCOG FIST Gel-Sealed Generic Closure Organizer  
  Gemini 1 Trans-Atlantic fiber optic cable network
GJ Generic Joint  
GPS FIST Generic Patching Shelf  
GPST FIST Generic Patch Shelf Tray  
GR Generic Rack  
  Graded-index fiber A fiber design in which the refractive
index of the core increases towards its centre. This construction bends the rays inward and allows them to travel faster in the region of lower refractive index.
This type of fiber provides the capability of high bandwidth.
GSS FIST Generic Splicing Shelf  
GTU Group Termination Unit Used to secure and provide axial pull
strength for pigtails before they are
spliced into network products
  Headend The central facility where signals are
combined and distributed in a cable television system.
Hz Hertz The unit of frequency. One Hertz is equal to one cycle per second. Named in
honor of Heinrich Hertz, first to detect
such waves in 1883.
HU Height Unit A unit used in Raychem’s racks and shelves.
IEC International Electrical IEC Central Office
Committee 3 rue de Varembé
  1211 Geneva 20
IFC Inter Facility Cable An IFC is an amount (e.g. 8 or 12) of 900 μm pigtails bundled in an outer jacket with kevlar and can be pre- or non
pre-connectorized. An IFC has the advantage of giving less congestion than X individual pigtails with outer jacket and kevlar.
IL Insertion Loss Additional loss in a system, for example,when a device such as a connector is
inserted. It is equal to the difference in
signal level between the input and
ISDN Integrated Services Digital Network A digital communications channel that allows for the integrated transmission of voice, video, and data. Basic Rate
Interface (2 voice/data channels and one signaling channel), Primary Rate Interface PRI  (23 voice/data channel and one signaling channel).
IP 53   Classification of the degree of protection
provided by an enclosure as defined in IEC Publication 529.
• 5 is dust-protected
• 3 is protected against sprayed water
IP 67   • 6 is dust-tight
• 7 is protected against the effects of temporary immersion in water
IP 65-7   • 6 is dust-tight
• 5 protected against water jets.
The third characteristic numeral is impact resistance as defined in a Belgian norm: NBN C20-001
• 7 represents an impact of 6 J (1.5 kg
hammer x 40 cm)
Kb/s (Kbps) Kilobits (thousands of bits) per second  
IS FibrBoss IFC Splicing Shelf  
ISO International Standards International Standards Organisation
Organisation 1 rue de Varembé
  1211 Geneve 20
J and JM Jumper Fiber optic cable that has connectors
installed on both ends.
  Kevlar Strength element used in cable to
provide support and additional protection of the fiber. The name is trademark of the DuPont Company.
KTR Kessel-Lo Test Report Proprietary report produced by Raychem Telecom R&D for internal use only.
KTU Kevlar Termination Unit Used to secure and provide axial pull
strength for pigtails before they are
spliced into network products
  Laser A device that amplifies light waves and
concentrates them  in a narrow, very
intense beam.
LED Light Emitting Diode A device used in a transmitter to convert information from electric to optical form. It typically has a large spectral width.
LAN Local Area Network A geographically limited communications network intended for the local transport of data, video and voice.
  Local loop The part of the telephone network
extending from the central (switching)
office to the subscriber.
  Loose tube A protective tube loosely surrounding a
cabled fiber, often filled with gel.
  Macrobending All macroscopic deviations from an
axially straight line in an optical
MB FIST Medium Box  
  Mechanical splicing Joining two fibers together by
mechanical means to enable a
continuous signal.
  Microbending Sharp curvatures involving local axial displacements of a few micrometers and spatial wavelengths of a few millimetre
in an optical waveguide. Such bends may result from waveguide coating, cabling, packaging, installation, etc.
μm Micron A millionth of a meter (10-6).
  Modulation The coding of information onto the carrier frequency. This includes amplitude and frequency- or phase-modulation
MOBRA Mounting bracket for the FIST-GCO  
  Multi-fiber cable An optical cable that contains two or
more fibers, each of which provides a
separate information channel.
  Multimode Transmits or emits multiple modes of
  Multimode Fiber An optical waveguide in which light travels in multimodes. Typical core/cladding sizes (measured in
microns) are 50/125, 62.5/125 and 100/140.
  Narrow-band Transmission at less than 2 Mbps
  Nanometer A unit of measure equal to one billionth of a meter (10-9).
NBN Belgian Institute for Norms NBN
Brabançonnelaan 29 1040 Brussels
  Node For networks, a branching or exchange point.
  Numerical aperture The number that expresses the light
gathering power of a fiber.
OC-1   Optical Carrier level 1. Electrical signals are converted into optical signals with a capacity of 51.84 Mbps (slightly higher speed than DS-3).
OC-9 = 466.56 Mbps,
OC-18 = 933.12 Mbps,
OC-24 1244.16 Mbps,
OC-36 at 1866.24 Mbps
OC-48 at 2.48 Gbps.
ODF Optical Distribution Frame  
OFS Optical Flexibility Shelf  
OLT Optical Light Terminal  
OMDF Optical Main Distribution Frame  
ONU Optical Network Unit  
OSP Outside Plant  
OTDR Optical Time Domain  
OTIAN Optical Telecommunications Infrastructure for the Access British Telecom trade name for optical
Network access network
  Out-of-Band Signaling A method of signaling which uses a frequency that is within the pass band of the transmission facility but outside of a carrier channel normally used for data transmission.
  Packet switching A technique of switching digital signals whereby the signal stream is broken into small packets and reassembled in the
correct sequence at its destination; this allows high-capacity and high speed transmission for data networks, satellite communications and secure voice
PSN Packet Switching Network A network designed to carry data in the form of packets. The packet and its
format are internal to that network. The
external interfaces may handle data in
different formats, and format conversion may be done by the user’s computer.
  Patchcord Fiber optic cable that has at least one connector end. Pigtails and jumpers are both patchcords.
PBX Private Branch Exchange A private telephone exchange that serves a particular organization and has connections to the public telephone network; refers to a multi-line telephone exchange terminal with various features for voice and data communications.
POP Point of Presence The physical access location within a LATA of long-distance and/or inter-LATA carrier. The point to which the telephone company terminates a subscriber’s circuit for long distance
dial-up or leased-line communications.
P or PT Pigtail Fiber optic cable that has a connector installed on one end.
  Passive device A static device that requires no power
for its intended functions.
PECO Pièce d’accrochage de câble optique Cable termination system
  Plenum cable Cable made of fire-retardant material that meets electrical code requirements
(UL 910) for low smoke generation and installation in air spaces.
  Plesiochronous Is an adjective that describes operations that are almost, but not quite, in synchronization - in other words, almost
synchronous. The term is used in the
Plesiochronous Digital Hierarchy
(PDH), the widely-used system in which the transmissions from one continent
(such as North America) are
internetworked with transmissions in
other continents (such as Europe) by making small adjustments in the
differing data rates between the systems.
PON Passive Optical Network  
POTS Plain Old Telephone System  
  Reflectance The full or partial return of transmitted optical or electromagnetic energy to the source by an index or impedance mismatch, measured in decibel (dB).
  Return loss The ratio of input power to reflected
power, measured in decibel (dB).
RFI Request for Information  
  Ribbon fiber Ribbonized fibers are primary coated
fibers placed next to each other in one plane. An acrylate coating or polyester tape keeps the fibers together.
  Riser cable Used in applications for indoor cables
that pass between floors. It is normally
used in a vertical shaft or space.
RL Residual loss Difference between the optical signal
before testing and that after testing
RS-232-C   A standard interface between a piece of equipment and a telephone circuit
RYC Kxxxx Raychem Quality Procedures  
SASA FIST Splitter Array Sub-Assembly  
SB FIST Small Box  
SCD Specification Control Drawing Simplified drawings of Raychem
products produced for customer use
SC-Tray FIST Single Circuit tray Splice tray to store different kind of splices and to handle arbitrary fiber overlengths in a controlled manner.
SECO Système d’épannouissem nt de câbles optiques Fiber break-out system, often called a
manifold device
SE-Tray FIST Single Element tray Splice tray to store different kind of
splices and to handle arbitrary fiber overlengths in a controlled manner.
  Simplex Single element as in a single fiber cable or single fiber connector.
  Single mode fiber An optical waveguide (or fiber) in which the signal travels in a single mode. The
fiber has a small core diameter.
SJ Spur Joint A type of closure application in a fiberoptic ring network
  Splice A mechanical or fusion joint connecting two fiber cables together.
  Splice closure A container used to organize and protect splices and splicing organizers.
SOSA FIST Splice Only Sub-Assembly  
  Splitter Another name for coupler (see coupler).
  Splitter ratio The ratio of power emerging from two
output ports of a coupler.
  Star A network topology where each node is
connected to a central hub. The hub establishes, maintains and terminates all connections between the nodes. In a LAN, the hub is likely to be a workstation, whereas in larger multiport networks. the hub is more likely to be a
STM Synchronous Transfer Mode A transport and switching method that depends on information occurring in regular and fixed patterns. A time division multiplex and switching technique to be used across the user’s network interface for a broadband ISDN.
  Synchronuous transmission A more sophisticated, faster transmission method than asynchronous whereby there is a constant interval between the transmitted bits, obviating the need for stop and start bits. However, the method demands that the twocomputers involved in the interchange
must be synchronized. This is achieved by the use of a clock in both devices and
control information sent with the transmission.
TAM Test Access Module  
TJ Track Joint A type of closure application in a fiberoptic ring network
TPON TPON Telephone Passive Optical  
TR12 FibrBoss Patching Tray  
TX FibrBoss Tray Patching Shelf  
UL Underwriters Laboratories Underwriters Laboratories Inc.
Publications Stock
333 Pfingsten Road, Northbrook, Illinois 60062 USA
UMS FIST MK2 Universal Mounting UMS profiles are used to click on the
System wraparound groove plates with organizer trays.
  Uniformity The variation in power level between the
optical outputs of a splitter.
VDO Video on Demand  
VFC Voice Frequency Channel  
WDM Wavelength Division A passive device that transmits signals at
Multiplexer different wavelengths through the same
  Wraparound grooveplate Part of FIST-SOSA2 and FIST-SASA2
subassemblies where the splice trays and
or splitter is clicked on.
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