IMPORTANT: Per accedir als fitxer de subversion: http://acacha.org/svn (sense password). Poc a poc s'aniran migrant els enllaços. Encara però funciona el subversion de la farga però no se sap fins quan... (usuari: prova i la paraula de pas 123456)

Fiber to the x

Compartir la fibra

Active Optical Network

Comparison showing how a typical active optical network handles downstream traffic differently than a typical passive optical network. The type of active optical network shown is a star network capable of multicasting. The type of passive optical network shown is a star network having multiple splitters housed in the same cabinet.

Active optical networks rely on some sort of electrically powered equipment in Optical Distribution Network(ODN) to distribute the signal, such as a switch or router. Normally, optical signals need O-E-O transformation in ODN. Each signal leaving the central office is directed only to the customer for which it is intended. Incoming signals from the customers avoid colliding at the intersection because the powered equipment there provides buffering. As of 2007, the most common type of active optical networks are called active Ethernet, a type of Ethernet in the first mile (EFM). Active Ethernet uses optical Ethernet switches to distribute the signal, thus incorporating the customers' premises and the central office into one giant switched Ethernet network. Such networks are identical to the Ethernet computer networks used in businesses and academic institutions, except that their purpose is to connect homes and buildings to a central office rather than to connect computers and printers within a campus. Each switching cabinet can handle up to 1,000 customers, although 400-500 is more typical. This neighborhood equipment performs layer 2/layer 3 switching and routing, offloading full layer 3 routing to the carrier's central office. The IEEE 802.3ah standard enables service providers to deliver up to 100 Mbit/s full-duplex over one single-mode optical fiber to the premises depending on the provider. Speeds of 1Gbit/s are becoming commercially available. [edit] Passive optical network

Passive Optical Network

Vegeu PON

Esquema de connexió

Cables

Latiguillos (patch cord)

Tipus de cables:

A cablematic tenen patch cords MM connector LC de fins a 25M. De fet la mida màxima dels latiguillos és de 25M.

Codi de colors dels latiguillos

Facilita la identificació:

Buffer/jacket color Meaning
Yellow single-mode optical fiber
Orange multi-mode optical fiber
Aqua 10 gig laser-optimized 50/125 micrometer multi-mode optical fiber
Grey outdated color code for multi-mode optical fiber
Blue Sometimes used to designate polarization-maintaining optical fiber

NOTA: El cable d'exteriors acostuma a ser negre

Connector Boot Meaning Comment
Blue Physical Contact (PC), 0° mostly used for single mode fibers; some manufacturers use this for polarization-maintaining optical fiber.
Green Angle Polished (APC), 8° not available for multimode fibers
Black Physical Contact (PC), 0°
Grey, Beige Physical Contact (PC), 0° multimode fiber connectors
White Physical Contact (PC), 0°
Red High optical power. Sometimes used to connect external pump lasers or Raman pumps.

Remark: It is also possible that a small part of a connector is additionally colour-coded, e.g. the leaver of an E-2000 connector or a frame of an adapter. This additional colour coding indicates the correct port for a patchcord, if many patchcords are installed at one point.

Connectors

FC/PC

Per exemple a l'Institut tenim un patch panel FC.

Hi ha latiguillos FC a FC en monomode (grocs):

http://www.cablematic.com/Latiguillo-de-fibra-optica/Cable-de-fibra-optica-FC-a-FC-monomodo-simplex-9_-_125-de-50-cm/?pag=1

O en multimode (tronges):


SC

LC

Recursos:

Switchs fibra

Transceptors

Independents

TPLINK

Vegeu TPLINK.

Optral

A l'Institut de l'Ebre tenim uns Optral (van cascar tots)

mini-GBIC SFP

Els Small form-factor pluggable (aka SFP o mini-GBIC ) són uns transductors (transceiver en angles) hot-pluggable compactes que converteixen una senyal òptica en senyal elèctrica utilitzats en telecomunicacions per a connectar medis òptics com la fibra òptica a dispositius Ethernet com switchos.

Al ser hotplug es poden posar en calent, és a dir, no cal aturar el commutador per a connectar el dispositiu.

Les especificacions ( form factor, electrical interface) són especificats per un multi-source agreement (MSA) i es un format estàndard suportat per la majoria de fabricants. Suporten estandards com SONET, Gigabit Ethernet, Fibre Channel...

Al ser més petit que el seu antecessor Gigabit interface converter (GBIC) fa que també se l'anomeni Mini-GBIC.

Hi ha diferents tipus segons el tipus de fibra, el tipus de conector, etc:

850 nm 550m MMF (SX)
1310 nm 10 km SMF (LX)
1550 nm [40 km (XD), 80 km (ZX), 120 km (EX or EZX)]
DWDM 

Recursos:

Problemes d'incompatibilitats i qüestions a tenir en compte

Segons quines combinacions de mòduls SFP es pot tenir problemes amb el link.

És possible que en alguns casos mòduls SFP de Cisco no donin link si no existeix transit en el moment de negociar l'enllaç. M'ha passat amb routers Cisco 3400. Vegeu com podeu generar transit a:

Trànsit

Instal·ladors

Fusionar fibra:


Instal·lacions realitzades a l'Institut de l'Ebre:

  • Pere Casas ??? Nom de l'empresa TODO --> Car i més del que inicialment havien pressupostat.
  • La fibra va ser proporcionada per Ebre Qualitat
c/Ciutadella, 12
43500 Tortosa - Tarragona -
Tel.:97 744 93 50 | Fax.: 97 744 06 77
Email: [email protected] | Web:http://www.ebrequalitat.com

FOCFibra.com --> http://www.focfibra.com utilitzada per Guifi.net a Gurb

Proveïdors

Catalunya

Internacionals

Fabricants

Planet

Amb el tema de la fibra, hem fet servir alguns routers planet, que van molt bé i surten molt bé de preu, que van sortir de cablematic. Si es va a la web de planet, a més d'aquests routers, tenen més coses interessants, com per exemple SPF de 120 qms... i altres coses com xassis per media converters, quips per GPONS, etc.. però ni de tros ho tenen a cablematic. Ramon Roca

Velocitats. Transmission rates

HI ha un concepte anomenat Optical Carrier transmission rates en xarxes SONET (Synchronous Optical Networking fiber optic networks). Alguns exemples de velocitats:

  • OC-1: OC-1 is a SONET line with transmission speeds of up to 51.84 Mbit/s (payload: 50.112 Mbit/s; overhead: 1.728 Mbit/s) using optical fiber.
  • OC-3: OC-3 is a network line with transmission data rate of up to 155.52 Mbit/s (payload: 148.608 Mbit/s; overhead: 6.912 Mbit/s, including path overhead) using fiber optics. Depending on the system OC-3 is also known as STS-3 (electrical level) and STM-1 (SDH).

Vegeu també Throughput.

Vegeu també

Enllaços externs