Fibre Technology                                                                     Printed 17/7 2000 RN

 

Fibres:

 

Multimode fibres              -Networks in buildings.

                      -Not demanding accuracy

                                            -Problems sith Band width

                      -Max. 2 kms without amplifying (but 550m at 50m)

 

Single mode                      fibres               -City networks

                                            -Fast

                                            -700 kms without amplifying

                                            -Demands Laser

 

Cladding                              Impurified glass that “mirrors” light signals back to the center.

 

l  850 nm- LED´s            l 1300nm- Buildings, Multimode

 

“Common” Ethernet                      10 Mbit/ s

Fast Ethernet                        100 Mbit/ s

Gigabit Ethernet                      1000 Mbit/ s

 

 

Example  1000 Base SX:

 

1000Mbit

Base Band technique

SX=Short Wave

(LX=Long Wave)

 

Insertion Loss= Loss in light direction (Dämpning I framriktningen).

 

Return Loss= Loss by reflections (Reflektionsdämpning).

 

APC= Angle Polished Contact- Angle of 8 degrees in cut.

 

4, 8, 12 Gigabit/ s in tests. 10 Terabit/ s in minds.

 

Megaservers creating new contract models for customers. Up to 1 Mkr.

 

OTDR= Optical Time Domain Reflectrometer.

 

96 fibre multiples.

 

Connectors

 

(Old) AMPs ST-connectors are allowed if there is an existing system in the building.

 

Otherwise: SC is used as standard system.

 

SC Duplex is what´s coming to the users.

 

 MT/ RJ (new) not standardized.

 

Identical holes to be made as for modular connections.

 

(Locked so copper connectors can´t be inserted).

 

Companies:                       AMP, Cisco, 3com, 3M, Panduit, Bay Networks, Cabletron Systems, XLNT,

Transition