For more about MPO Connector Types, watch the “Overview of MPO Connectors” video above. MPO vs MTP Connectors Although the terms MPO and MTP are sometimes used interchangeably, MTP is the trade name for a specific multi-fiber connector produced by US Conec and stands for “Multi-fiber Termination Push On”.
I have two tables in MySQL. Table Person has the following columns:
The
fruits
column may hold null or an array of strings like ('apple', 'orange', 'banana'), or ('strawberry'), etc. The second table is Table Fruit and has the following three columns:So how should I design the
fruits
column in the first table so that it can hold array of strings that take values from the fruit_name
column in the second table? Since there is no array data type in MySQL, how should I do it?tongatonga
7 Answers
The proper way to do this is to use multiple tables and
JOIN
them in your queries.For example:
The
person_fruit
table contains one row for each fruit a person is associated with and effectively links the person
and fruits
tables together, I.E.When you want to retrieve a person and all of their fruit you can do something like this:
Bad WolfBad Wolf
The reason that there are no arrays in SQL, is because most people don't really need it. Relational databases (SQL is exactly that) work using relations, and most of the time, it is best if you assign one row of a table to each 'bit of information'. For example, where you may think 'I'd like a list of stuff here', instead make a new table, linking the row in one table with the row in another table.[1] That way, you can represent M:N relationships. Another advantage is that those links will not clutter the row containing the linked item. And the database can index those rows. Arrays typically aren't indexed.
If you don't need relational databases, you can use e.g. a key-value store.
Read about database normalization, please. The golden rule is '[Every] non-key [attribute] must provide a fact about the key, the whole key, and nothing but the key.'. An array does too much. It has multiple facts and it stores the order (which is not related to the relation itself). And the performance is poor (see above).
Imagine that you have a person table and you have a table with phone calls by people. Now you could make each person row have a list of his phone calls. But every person has many other relationships to many other things. Does that mean my person table should contain an array for every single thing he is connected to? No, that is not an attribute of the person itself.
[1]: It is okay if the linking table only has two columns (the primary keys from each table)! If the relationship itself has additional attributes though, they should be represented in this table as columns.
Janus TroelsenJanus Troelsen
MySQL 5.7 now provides a JSON data type. This new datatype provides a convenient new way to store complex data: lists, dictionaries, etc.
That said, rrays don't map well databases which is why object-relational maps can be quite complex. Historically people have stored lists/arrays in MySQL by creating a table that describes them and adding each value as its own record. The table may have only 2 or 3 columns, or it may contain many more. How you store this type of data really depends on characteristics of the data.
For example, does the list contain a static or dynamic number of entries? Will the list stay small, or is it expected to grow to millions of records? Will there be lots of reads on this table? Lots of writes? Lots of updates? These are all factors that need to be considered when deciding how to store collections of data.
Also, Key:Value data stores / Document stores such as Cassandra, MongoDB, Redis etc provide a good solution as well. Just be aware of where the data is actually being stored (if its being stored on disk or in memory). Not all of your data needs to be in the same database. Some data does not map well to a relational database and you may have reasons for storing it elsewhere, or you may want to use an in-memory key:value database as a hot-cache for data stored on disk somewhere or as an ephemeral storage for things like sessions.
Charles AddisCharles Addis
A sidenote to consider, you can store arrays in Postgres.
Eric GrotkeEric Grotke
In MySQL, use the JSON type.
Contra the answers above, the SQL standard has included array types for almost twenty years; they are useful, even if MySQL has not implemented them.
In your example, however, you'll likely want to create three tables: person and fruit, then person_fruit to join them.
If you wish to associate the person with an array of fruits, you can do so with a view:
The view shows the following data:
In 5.7.22, you'll want to use JSON_ARRAYAGG, rather than hack the array together from a string.
drewdrew
Use database field type BLOB to store arrays.
Ref: http://us.php.net/manual/en/function.serialize.php
Return Values
Returns a string containing a byte-stream representation of value that can be stored anywhere.
Note that this is a binary string which may include null bytes, and needs to be stored and handled as such. For example, serialize() output should generally be stored in a BLOB field in a database, rather than a CHAR or TEXT field.
webdevfreakwebdevfreak
you can store your array using group_Concat like that
HERE an example in fiddle
echo_Meecho_Me
Not the answer you're looking for? Browse other questions tagged mysqldatabase-schema or ask your own question.
(Redirected from MT-RJ)
LC (top) and ST (bottom) optical fiber connectors, both with protective caps in place.
An optical fiber connectorterminates the end of an optical fiber, and enables quicker connection and disconnection than splicing. The connectors mechanically couple and align the cores of fibers so light can pass. Better connectors lose very little light due to reflection or misalignment of the fibers. In all, about 100 different types of fiber optic connectors have been introduced to the market.[1]
- 2Types
Application[edit]
Optical fiber connectors are used to join optical fibers where a connect/disconnect capability is required. Due to the polishing and tuning procedures that may be incorporated into optical connector manufacturing, connectors are often assembled onto optical fiber in a supplier's manufacturing facility. However, the assembly and polishing operations involved can be performed in the field, for example, to terminate long runs at a patch panel.
Optical fiber connectors are used in telephone exchanges, for customer premises wiring, and in outside plant applications to connect equipment and cables, or to cross-connect cables.
Most optical fiber connectors are spring-loaded, so the fiber faces are pressed together when the connectors are mated. The resulting glass-to-glass or plastic-to-plastic contact eliminates signal losses that would be caused by an air gap between the joined fibers.
Performance of optical fiber connectors can be quantified by insertion loss and return loss. Measurements of these parameters are now defined in IEC standard 61753-1. The standard gives five grades for insertion loss from A (best) to D (worst), and M for multimode. The other parameter is return loss, with grades from 1 (best) to 5 (worst).
A variety of optical fiber connectors are available, but SC and LC connectors are the most common types of connectors on the market.[2] Typical connectors are rated for 500–1,000 mating cycles.[3] The main differences among types of connectors are dimensions and methods of mechanical coupling. Generally, organizations will standardize on one kind of connector, depending on what equipment they commonly use.
In many data center applications, small (e.g., LC) and multi-fiber (e.g., MTP/MPO) connectors have replaced larger, older styles (e.g., SC), allowing more fiber ports per unit of rack space.
Outside plant applications may require connectors be located underground, or on outdoor walls or utility poles. In such settings, protective enclosures are often used, and fall into two broad categories: hermetic (sealed) and free-breathing. Hermetic cases prevent entry of moisture and air but, lacking ventilation, can become hot if exposed to sunlight or other sources of heat. Free-breathing enclosures, on the other hand, allow ventilation, but can also admit moisture, insects and airborne contaminants. Selection of the correct housing depends on the cable and connector type, the location, and environmental factors.
Types[edit]
Many types of optical connector have been developed at different times, and for different purposes. Many of them are summarized in the tables below.
Short name | Long form | Coupling type | Screw thread | Ferrule diameter | Standard | Typical applications | Image |
---|---|---|---|---|---|---|---|
Avio (Avim) | Aviation Intermediate Maintenance | Screw | ? | Aerospace and avionics | |||
ADT-UNI | Screw | ? | 2.5 mm | Measurement equipment | |||
DMI | Diamond Micro Interface[4] | Clip | n/a | 2.5 mm | Printed circuit boards | ||
E-2000 or LSH | Snap, with light and dust-cap | n/a | 2.5 mm | IEC 61754-15 | Telecom, DWDM systems; | ||
EC | push-pull type | n/a | IEC 1754-8[5] | Telecom and CATV networks | |||
ELIO | Bayonet | n/a | 2.5 mm | ABS1379 | PC or UPC | ||
ESCON | Enterprise Systems Connection | Snap (duplex)[1] | n/a | 2.5 mm | IBM mainframe computers and peripherals | ||
F07 | 2.5 mm | Japanese Industrial Standard (JIS) | LAN, audio systems; for 200 μm fibers, simple field termination possible, mates with ST connectors | ||||
F-3000 | Snap, with light and dust-cap | n/a | 1.25 mm | IEC 61754-20 | Fiber To The Home (LC Compatible) | ||
FC | Ferrule Connector or Fiber Channel[6] | Screw | M8×0.75[7] | 2.5 mm | IEC 61754-13[5] | Datacom, telecom, measurement equipment, single-mode lasers[8] | |
Fibergate | Snap, with dust-cap | n/a | 1.25 mm | Backplane connector | |||
FJ | Fiber-Jack[9]or Opti-Jack[6] | Snap (duplex)[1] | n/a | 2.5 mm | Building wiring, wall outlets | ||
LC | Lucent Connector,[6] Little Connector,[10]or Local Connector[10] | Snap | n/a | 1.25 mm | IEC 61754-20[5] | High-density connections, SFP and SFP+ transceivers, XFP transceivers[8] | |
Lucxis | 1.25 mm | ARINC 801 | PC or APC configurations (note 3) | ||||
LX-5 | Snap, with light- and dust-cap | n/a | IEC 61754-23 | High-density connections; rarely used | |||
M12-FO | Duplex screw | M16 | 2.5 mm | EN 61754-27, ISO/IEC 61754-27 | Machine, process and plant engineering. IP-67 dust and water resistant | ||
MIC | Media Interface Connector | Snap | n/a | 2.5 mm | Fiber distributed data interface (FDDI) | ||
MPOor MTP | Multiple-Fiber Push-On/Pull-off[6] | Snap (multiplex push-pull coupling) | n/a | 2.5×6.4 mm[11] | IEC-61754-7;[5] EIA/TIA-604-5 (FOCIS 5) | SM or MM multi-fiber ribbon. Same ferrule as MT, but more easily reconnectable.[11] Used for indoor cabling and device interconnections. MTP is a brand name for an improved connector, which intermates with MPO.[12] | |
MT | Mechanical Transfer | Snap (multiplex)[1] | n/a | 2.5×6.4 mm | Pre-terminated cable assemblies; outdoor applications[11] | ||
MT-RJ | Mechanical Transfer Registered Jack or Media Termination - recommended jack[6] | Snap (duplex)[1] | n/a | 2.45×4.4 mm | IEC 61754-18 | Duplex multimode connections | |
MU | Miniature unit[6] | Snap | n/a | 1.25 mm | IEC 61754-6 | Common in Japan[1] | |
SC | Subscriber connector,[6] square connector[6]or standard connector | Snap (push-pull coupling) | n/a | 2.5 mm | IEC 61754-4[5] | Datacom and telecom; GPON; EPON; GBIC; MADI | |
SC-DC/ SC-QC | SC-Dual Contact/ SC-Quattro Contact[9] | Snap (push-pull coupling; duplex) | n/a | 2.5 mm | IEC 61754-4 | Datacom and telecom; GPON; EPON; GBIC | |
SMA 905 F-SMA I | Sub Miniature A | Screw | 1/4'-36 UNS 2B | 3.17 mm[13] | IEC 60874-2 | Industrial lasers, optical spectrometers, military; telecom multimode | |
SMA 906 F-SMA II | Sub Miniature A | Screw | 1/4'-36 UNS 2B | Stepped; typ. 0.118 in (3.0 mm), then 0.089 in (2.3 mm)[citation needed] | IEC 60874-2 | Industrial lasers, military; telecom multimode | |
SMC | Sub Miniature C | Snap | n/a | 2.5 mm | |||
ST or BFOC | Straight Tip[6]or Bayonet Fiber Optic Connector | Bayonet | n/a | 2.5 mm | IEC 61754-2[5] | Datacom | |
TOSLINK | Toshiba Link | Snap | n/a | most common is JIS F05 | Digital audio | ||
VF-45 | Volition Fiber | Snap | n/a | None - V-grooves as guidance | Datacom | ||
1053 HDTV | Broadcast connector interface | Push-pull coupling | n/a | Industry-standard 1.25 mm diameter ceramic ferrule | Audio & Data (broadcasting) | ||
V-PIN | V-System | Snap (Duplex) Push-pull coupling | n/a | Industrial and electric utility networking; multimode 200 μm, 400 μm, 1 mm, 2.2 mm fibers |
Obsolete connectors[edit]
Short name | Long form | Coupling type | Screw thread | Ferrule diameter | Standard | Typical applications |
---|---|---|---|---|---|---|
Biconic[1] | Screw | 2.5 mm | ||||
D4 (NEC)[1] | Screw | 2.0 mm | Japanese telecom in the 1970s and 1980s | |||
Deutsch 1000 | Screw | Telecom | ||||
DIN (LSA) | Screw | IEC 61754-3[5] | Telecom in Germany in 1990s, measurement equipment | |||
OPTIMATE | Screw | Plastic fiber | ||||
OptoClip II | Snap (push-pull coupling) | n/a | None - bare fiber used | Proprietary Hüber & Suhner | Datacom and telecom, last made in 2005[citation needed] |
Notes[edit]
- Modern connectors typically use a 'physical contact' polish on the fiber and ferrule end. This is a slightly convex surface with the apex of the curve accurately centered on the fiber, so that when the connectors are mated the fiber cores come into direct contact with one another.[14][15] Some manufacturers have several grades of polish quality, for example a regular FC connector may be designated 'FC/PC' (for physical contact), while 'FC/SPC' and 'FC/UPC' may denote 'super' and 'ultra' polish qualities, respectively. Higher grades of polish give less insertion loss and lower back reflection.
- Many connectors are available with the fiber end face polished at an angle to prevent light that reflects from the interface from traveling back up the fiber. Because of the angle, the reflected light does not stay in the fiber core but instead leaks out into the cladding. Angle-polished connectors should only be mated to other angle-polished connectors. The APC angle is normally 8 degrees, however, SC/APC also exists as 9 degrees in some countries. Mating to a non-angle polished connector causes very high insertion loss. Generally angle-polished connectors have higher insertion loss than good quality straight physical contact ones. 'Ultra' quality connectors may achieve comparable back reflection to an angled connector when connected, but an angled connection maintains low back reflection even when the output end of the fiber is disconnected.
- Angle-polished connections are distinguished visibly by the use of a green strain relief boot, or a green connector body. The parts are typically identified by adding '/APC' (angled physical contact) to the name. For example, an angled FC connector may be designated FC/APC, or merely FCA. Non-angled versions may be denoted FC/PC or with specialized designations such as FC/UPC or FCU to denote an 'ultra' quality polish on the fiber end face. Two different versions of FC/APC exist: FC/APC-N (NTT) and FC/APC-R (Reduced). An FC/APC-N connector key will not fit into a FC/APC-R adapter key slot.
- SMA 906 features a 'step' in the ferrule, while SMA 905 uses a straight ferrule. SMA 905 is also available as a keyed connector, used e.g., for special spectrometer applications.
Mnemonics[edit]
- LC connectors are sometimes called 'Little Connectors'.[citation needed]
- MT-RJ connectors look like a miniature RJ-45 connector.
- ST connectors refer to having a 'straight tip', as the sides of the ceramic (which has a lower temperature coefficient of expansion than metal) tip are parallel—as opposed to the predecessor bi-conic connector which aligned as two nesting ice cream cones would. Other mnemonics include 'Set and Twist', 'Stab and Twist', and 'Single Twist',[citation needed] referring to how it is inserted (the cable is pushed into the receiver, and the outer barrel is twisted to lock it into place). Also they are known as 'Square Top' due to the flat end face.[citation needed]
- SC connectors, being square, have a mnemonic of 'Square Connector', which some people believe to be the correct name, rather than the more official 'Subscriber Connector'.[6] Other terms often used for SC connectors are 'Set and Click' or 'Stab and Click'.[citation needed]
- SMA is short for 'subminiature assembly'.
Field-mountable connectors[edit]
Field-mountable optical fiber connectors are used to join optical fiber jumper cables that contain one singlemode fiber. These assemblies can be separated into two major categories: single-jointed connector assemblies and multiple-jointed connector assemblies. According to TelcordiaGR-1081,[16] a single-jointed connector assembly is a connector assembly where there is only one spot where two different fibers are joined together. This is the situation generally found when connector assemblies are made from factory-assembled optical fiber connector plugs. A multiple-jointed connector assembly is a connector assembly where there is more than one closely spaced connection joining different fibers together. An example of a multiple-jointed connector assembly is a connector assembly that uses the stub-fiber type of connector plug.
Field-mountable optical fiber connectors are used for field restoration work and to eliminate the need to stock jumper cords of various sizes.
Attributes[edit]
Features of good connector design:
- Low insertion loss
- High return loss (low amounts of reflection at the interface)
- Ease of installation
- Low cost
- Reliability
- Low environmental sensitivity
- Ease of use
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Analysis[edit]
- The SMA connector was the first widely used standard connector, developed in the 1970s by Amphenol using the design geometry of the SMA RF connector.[17] It was designed for large-diameter multimode fiber applications, for which it is still widely used in industry and medicine. It lacks features important to communications applications, for which it is considered obsolete.
- FC connectors' floating ferrule provides good mechanical isolation. FC connectors need to be mated more carefully than the push-pull types due to the need to align the key, and due to the risk of scratching the fiber end face while inserting the ferrule into the jack. FC connectors should not be used in vibrating environments due to its threaded lock. FC connectors have been replaced in many applications by SC and LC connectors.[1]
- There are two incompatible standards for key widths on FC/APC and polarization-maintaining FC/PC connectors: 2 mm ('Reduced' or 'type R') and 2.14 mm ('NTT' or 'type N').[18] Connectors and receptacles with different key widths either cannot be mated, or will not preserve the angle alignment between the fibers, which is especially important for polarization-maintaining fiber. Some manufacturers mark reduced keys with a single scribe mark on the key, and mark NTT connectors with a double scribe mark.
- SC connectors offer excellent packing density, and their push-pull design reduces the chance of fiber end face contact damage during connection; frequently found on the previous generation of corporate networking gear, using GBICs.
- LC connectors have replaced SC connectors in corporate networking environments due to their smaller size; they are often found on small form-factor pluggable transceivers.
- ST connectors have a key which prevents rotation of the ceramic ferrule, and a bayonet lock similar to a BNC shell. The single index tab must be properly aligned with a slot on the mating receptacle before insertion; then the bayonet interlock can be engaged, by pushing and twisting, locking at the end of travel which maintains spring-loaded engagement force on the core optical junction.
- In general, the insertion loss should not exceed 0.75 dB and the return loss should be higher than 20 dB. Typical insertion repeatability, the difference in insertion loss between one plugging and another, is 0.2 dB.
- On all connectors, cleaning the ceramic ferrule before each connection helps prevent scratches and extends the connector life substantially.
- Connectors on polarization-maintaining fiber are sometimes marked with a blue strain relief boot or connector body, although this is far from a universal standard. Sometimes a blue buffer tube is used on the fiber instead.[19]
- MT-RJ (Mechanical Transfer Registered Jack) uses a form factor and latch similar to the 8P8C (RJ45) connectors. Two separate fibers are included in one unified connector. It is easier to terminate and install than ST or SC connectors. The smaller size allows twice the port density on a face plate than ST or SC connectors do. The MT-RJ connector was designed by AMP, but was later standardized as FOCIS 12 (Fiber Optic Connector Intermateability Standards) in EIA/TIA-604-12. There are two variations: pinned and no-pin. The pinned variety, which has two small stainless steel guide pins on the face of the connector, is used in patch panels to mate with the no-pin connectors on MT-RJ patch cords.
- MPO (Multi-fiber Push On) is a connector for ribbon cables with four to twenty-four fibers.[20] Connectors for singlemode fiber have angled ends to minimize back-reflection, while multimode fiber versions typically have flat ends. MTP is a brand name for a version of the MPO connector with improved specifications. MTP and MPO connectors intermate.
- Hardened Fiber Optic Connectors (HFOCs) and Hardened Fiber Optic Adapters (HFOAs) are passive telecommunications components used in an Outside Plant (OSP) environment. They provide drop connections to customers from fiber distribution networks. These components may be provided in pedestal closures,[note 1][21] aerial and buried closures and terminals, or equipment located at customer premises such as a Fiber Distribution Hub (FDH) or an Optical Network Terminal or Termination (ONT) unit.
- These connectors, which are field-mateable and hardened for use in the OSP, are needed to support Fiber to the Premises (FTTP) deployment and service offerings. HFOCs are designed to withstand climatic conditions existing throughout the U.S., including rain, flooding, snow, sleet, high winds, and ice and sand storms. Ambient temperatures ranging from −40 °C (−40 °F) to 70 °C (158 °F) can be encountered.
- Telcordia GR-3120[22] contains the industry’s most recent generic requirements for HFOCs and HFOAs.
Testing[edit]
Glass fiber optic connector performance is affected both by the connector and by the glass fiber. Concentricity tolerances affect the fiber, fiber core, and connector body. The core optical index of refraction is also subject to variations. Stress in the polished fiber can cause excess return loss. The fiber can slide along its length in the connector. The shape of the connector tip may be incorrectly profiled during polishing. The connector manufacturer has little control over these factors, so in-service performance may well be below the manufacturer's specification.
Testing fiber optic connector assemblies falls into two general categories: factory testing and field testing.
Factory testing is sometimes statistical, for example, a process check. A profiling system may be used to ensure the overall polished shape is correct, and a good quality optical microscope to check for blemishes. Optical Loss / Return Loss performance is checked using specific reference conditions, against a reference-standard single mode test lead, or using an 'Encircled Flux Compliant' source for multi-mode testing. Testing and rejection ('yield') may represent a significant part of the overall manufacturing cost.
Field testing is usually simpler. A special hand-held optical microscope is used to check for dirt or blemishes. A power meter and light source or an optical loss test set (OLTS) is used to test end-to-end loss, and an optical time-domain reflectometer may be used to identify significant point losses or return losses.
Notes[edit]
- ^Pedestal terminal closures are intended to house passive telecommunications components used in an Outside Plant (OSP) environment. According to TelcordiaGR-13, these closures may house such components as copper terminal blocks, coaxial taps, or passive fiber optic distribution equipment used for the distribution of telephone service and broadband services.
See also[edit]
- Optical fiber cable – color coding of connector boot and fiber cable jackets
- Optical attenuator – fiber optic attenuator
- Gap loss – attenuation sources and causes
- Index-matching material –a liquid/gel to reduce Fresnel reflection
References[edit]
- ^ abcdefghi'Connector identifier'. The Fiber Optic Association. 2010. Retrieved Oct 18, 2014.
- ^Silva, Mário Marques da (2016-01-06). Cable and Wireless Networks: Theory and Practice. CRC Press. ISBN9781498746830.
- ^Alwayn, Vivek (2004). 'Fiber-Optic Technologies'. Retrieved Aug 15, 2011.
- ^'DMI datasheet'(PDF). DIAMOND SA. Retrieved 6 Oct 2014.
- ^ abcdefg'The History of Connectors - AFL Hyperscale'. AFL Hyperscale. Retrieved 2018-11-05.
- ^ abcdefghijKeiser, Gerd (August 2003). Optical Communications Essentials. McGraw-Hill Networking Professional. p. 132–. ISBN0-07-141204-2.
- ^TIA Standard FOCIS-4, TIA-604-4-B
- ^ ab'Fiber Optic Connectors'. Retrieved Oct 18, 2014.
- ^ ab'Small Form Factor Fiber Optic Connectors Tutorial'. Fiberstore. June 3, 2014. Retrieved Oct 18, 2014.
- ^ abUS patent 20140126875, Lou Guzzo, Inman, SC (US), 'Connector Ferrule Holder', issued 2014-05-08
- ^ abcShimoji, Naoko; Yamakawa, Jun; Shiino, Masato (1999). 'Development of Mini-MPO Connector'(PDF). Furukawa Review (18): 92.
- ^'Frequently asked questions'. US Conec. Retrieved 12 Feb 2009.
- ^'Amphenol Fiber Optics products catalog, SMA standard definition, page 131-132'(PDF). Retrieved 2019-02-28.
- ^'The Importance of Geometry for Fiber Optic Connectors'(pdf). Corning Cable Systems. April 2006.
- ^Yin, Ling; Huang, H.; Chen, W.K.; Xiong, Z.; Liu, Y.C.; Teo, P.L. (May 2004). 'Polishing of fiber optic connectors'(PDF). International Journal of Machine Tools and Manufacture. 44 (6): 659–668. doi:10.1016/j.ijmachtools.2003.10.029.
- ^GR-1081, Generic Requirements for Field-Mountable Optical Fiber Connectors, Telcordia.
- ^Neal Weiss (July 7, 2016). 'What is an SMA connector and why do we care?'. Fiber Optic Center. Retrieved August 16, 2018.
- ^Sezerman, Omur; Best, Garland (December 1997). 'Accurate alignment preserves polarization'(PDF). Laser Focus World. Retrieved December 7, 2016.
- ^'Polarization maintaining fiber patchcords and connectors'(pdf). OZ Optics. Retrieved Feb 6, 2009.
- ^'MTP/MPO Fiber Solution'.
- ^GR-13-CORE, Generic Requirements for Pedestal Terminal Closures, Telcordia.
- ^GR-3120, Generic Requirements for Hardened Fiber Optic Connectors (HFOCs) and Hardened Fiber Optic Adapters (HOFAs), Telcordia.
External links[edit]
Wikimedia Commons has media related to Optical fiber connectors. |
- SC Connector termination anaerobic processes (Video)
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