Technical data

2.3.2 Topology of an Optical SINEC L2FO Network
Using an active star coupler (AS 501) several stations can be connected
together in a star network ( Fig. 2.6).The connection between the DTE and
the active star coupler or between active star couplers is a plastic fiber-optic
cable (980/1000
µ
m) or glass fiber-optic cable (62.5/125
µ
m).The maximum
distance between a DTE and the active star coupler determines the
maximum distance of 2800 m between any two DTEs. By cascading star
couplers, the maximum distance is increased by a further 1400 m with each
active star coupler. Apart from the star coupler, modular fiber-optic
components are available under the name ’optical link module’ (OLM) for
glass and plastic fibers.
By connecting two DTEs directly with a fiber-optic cable, an optical
point-to-point link can be implemented. No active star coupler is required.
The maximum distance between DTEs with glass fiber-optic cables is 1,400
m ( Fig. 2.7).
DTEDTE
DTEDTE
*
DTE
DTE
DTE
*
DTE
Fig. 2.6 Star Couplers with DTEs
DTE
DTE
Fig. 2.7 DTEs in a Point-to-Point Link
System Overview B8976060/02
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