15
6650-2212
Optical Power Budget
The maximum supported link lengths as specified in the table above should only been
seen as indicative. The allowed link length is calculated from the Optical Power Budget
(OPB), (the available optical power for a fibre-optic link), and the attenuation of the fibre,
comprising losses due to in-line connectors, splices, optical switches and a margin for link
aging (typical 1.5 dB for 1300 nm).
The worst-case Optical Power Budget (OPB) in dB for a fibre-optic link is determined
by the difference between the minimum transmitter output optical power and the lowest
receiver sensitivity.
*
Output power is power coupled into a 62.5/125 μm multimode fibre.
** Output power is power coupled into a 9/125 μm singlemode fibre.
***
The optical power should be reduced by at least 5 dB (SM-LC80)
or 3dB (SM-LC80) between the optical output and input.
FX (Fibre)
SM-LC80
SM-LC40
SM-LC15
MM-LC2
Fibre connector
LC duplex
LC duplex
LC duplex
LC duplex
Fibre type
Singlemode
9/125 μm
Singlemode
9/125 μm
Singlemode
9/125 μm
Multimode
62.5/125 and
50/125 μm
Wavelength
1550 nm
1310 nm
1310 nm
1310 nm
Transmitter
Output optical power min/max
–5/0 dBm
**
–5/0 dBm
**
–15/–8 dBm
**
–20/–14 dBm
*
Receiver
Input sensitivity
–34 dBm
(max)
–34 dBm
(max)
–31 dBm
(max)
–31 dBm
(max)
Receiver
Input optical power Maximum
–5 dBm
(min) ***
–3 dBm
(min) ***
–8 dBm
(min)
–8 dBm
(min)
Optical power budget, worst case
29 dB
29 dB
16 dB
11 dB
Bit error rate (BER)
<1 x 10
–10
<1 x 10
–10
<1 x 10
–10
<2.5 x 10
–10
Transceiver type
Small Form Factor Pluggable (SFP)
Multi-Sourcing Agreement (MSA) compliant
Laser class
Class 1, IEC 825-1 Accessible Emission Limit (AEL)
PROFIBUS DP (RS-485)
Electrical specification
EIA RS-485 / EN 50 170
Data rate
9 600 bit/s, 19.2, 93.75, 187.5, 500 kbit/s, 1.5, 3, 6 and 12 Mbit/s
Data format
8 data bits, even parity, 1 stop bit, 11 bits total
Protocol
PROFIBUS DP / EN 50170
Data Rate detection
Yes, compliant with EN 50 170
Retiming
Yes
Turn around time
In accordance with EN 50 170
Transmission range
≤
1200 m, depending on data rate and cable type (EIA RS-485)
Settings
None, external termination and failsafe biasing
Protection
Installation Fault Tolerant (up to ±60 V)
Isolation to
Power and Status port
Connection
9-pin D-sub female
Shielded cable
Not required
Conductive housing
Isolated to all other circuits and housings
AUDIN - 8, avenue de la malle - 51370 Saint Brice Courcelles - Tel : 03.26.04.20.21 - Fax : 03.26.04.28.20 - Web : http: www.audin.fr - Email : info@audin.fr
