ID
2
net Installation & Commissioning Manual
7
997-448-000-2, Issue 2
July 2004
Inst
allation
d. Use screened cables to comply with the
EMC requirements and reduce the
possibility of external interference.
The following table lists cables tested and
maximum distances achieved:
Each link in a network may be either copper-
conductor cable or optical fibre.
Caution: To ensure specified performance
use only 2-core, screened cables.
On no account must multi-core
cables be used.
3.3.1 Fibre-optic Cable Limits
The fibre-optic link used by the ID
2
net network
has the following specification:
a. Connector style
ST
b. Link
Duplex (Twin Fibre)
c. Wavelength
820nm
d. Fibre Type
Multi-mode
Parameter
Min. (dB) Typical (dB)
Optical Power Budget
50/125µm Fibre
4.2
9.6
Optical Power Budget
62.5/125µm Fibre
8.0
15
Notes:
1
For a typical 62.5/125 cable, attenuation is
2.8dB/km which gives a typical link length
of 15/2.8 = 5300m.
2
Using worst-case figures, attenuation of
4.5dB/km gives a link length of:
8/4.5 = 1800m.
3
For a specific design, substitute the
attenuation figure for the fibre to be used
into the calculation.
4
Allowance should be made for any
additional splices or connectors used.
Cable Type
Recommended
Max. Test
Operating Distance (m) Distance (m)
Pirelli FP200 Flex 1.5mm
2
850
1000
Draka Firetuf FDZ2ER (1.5mm
2
/2.5mm
2
)
1200
1400
AEI MICC 2L1.5 (1.5mm
2
)
1200
1400
AEI Firetec F2CxxE (1.0mm
2
/1.5mm
2
)
1350
1600
Pirelli FP200 Gold 1.5mm
2
1700
2000
